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Versions: 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 RFC 5102

Network Working Group                                         J. Quittek
Internet-Draft                                                       NEC
Expires: March 26, 2006                                        S. Bryant
                                                               B. Claise
                                                           Cisco Systems
                                                                J. Meyer
                                                                  PayPal
                                                      September 22, 2005


            Information Model for IP Flow Information Export
                        draft-ietf-ipfix-info-11

Status of this Memo

   By submitting this Internet-Draft, each author represents that any
   applicable patent or other IPR claims of which he or she is aware
   have been or will be disclosed, and any of which he or she becomes
   aware will be disclosed, in accordance with Section 6 of BCP 79.

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   http://www.ietf.org/shadow.html.

   This Internet-Draft will expire on March 26, 2006.

Copyright Notice

   Copyright (C) The Internet Society (2005).

Abstract

   This memo defines an information model for the IP Flow Information
   eXport (IPFIX) protocol.  It is used by the IPFIX protocol for
   encoding measured traffic information and information related to the
   traffic Observation Point, the traffic Metering Process and the



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   Exporting Process.  Although developed for the IPFIX protocol, the
   model is defined in an open way that easily allows using it in other
   protocols, interfaces, and applications.


Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   7
   2.  Properties of IPFIX Protocol Information Elements . . . . . .   7
     2.1.  Information Elements Specification Template . . . . . . .   8
     2.2.  Scope of Information Elements . . . . . . . . . . . . . .   9
     2.3.  Naming Conventions for Information Elements . . . . . . .   9
   3.  Type Space  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     3.1.  Data Types  . . . . . . . . . . . . . . . . . . . . . . .  10
       3.1.1.  octet . . . . . . . . . . . . . . . . . . . . . . . .  10
       3.1.2.  unsigned16  . . . . . . . . . . . . . . . . . . . . .  11
       3.1.3.  unsigned32  . . . . . . . . . . . . . . . . . . . . .  11
       3.1.4.  unsigned64  . . . . . . . . . . . . . . . . . . . . .  11
       3.1.5.  float32 . . . . . . . . . . . . . . . . . . . . . . .  11
       3.1.6.  boolean . . . . . . . . . . . . . . . . . . . . . . .  11
       3.1.7.  macAddress  . . . . . . . . . . . . . . . . . . . . .  11
       3.1.8.  octetArray  . . . . . . . . . . . . . . . . . . . . .  11
       3.1.9.  string  . . . . . . . . . . . . . . . . . . . . . . .  11
       3.1.10. dateTimeSeconds . . . . . . . . . . . . . . . . . . .  11
       3.1.11. dateTimeMilliSeconds  . . . . . . . . . . . . . . . .  12
       3.1.12. dateTimeMicroSeconds  . . . . . . . . . . . . . . . .  12
       3.1.13. dateTimeNanoSeconds . . . . . . . . . . . . . . . . .  12
       3.1.14. ipv4Address . . . . . . . . . . . . . . . . . . . . .  12
       3.1.15. ipv6Address . . . . . . . . . . . . . . . . . . . . .  12
     3.2.  Data Type Semantics . . . . . . . . . . . . . . . . . . .  12
       3.2.1.  quantity  . . . . . . . . . . . . . . . . . . . . . .  12
       3.2.2.  totalCounter  . . . . . . . . . . . . . . . . . . . .  12
       3.2.3.  deltaCounter  . . . . . . . . . . . . . . . . . . . .  13
       3.2.4.  identifier  . . . . . . . . . . . . . . . . . . . . .  13
       3.2.5.  flags . . . . . . . . . . . . . . . . . . . . . . . .  13
   4.  Information Element Identifiers . . . . . . . . . . . . . . .  13
   5.  Information Elements  . . . . . . . . . . . . . . . . . . . .  17
     5.1.  Identifiers . . . . . . . . . . . . . . . . . . . . . . .  18
       5.1.1.  lineCardId  . . . . . . . . . . . . . . . . . . . . .  18
       5.1.2.  portId  . . . . . . . . . . . . . . . . . . . . . . .  18
       5.1.3.  ingressInterface  . . . . . . . . . . . . . . . . . .  18
       5.1.4.  egressInterface . . . . . . . . . . . . . . . . . . .  19
       5.1.5.  meteringProcessId . . . . . . . . . . . . . . . . . .  19
       5.1.6.  exportingProcessId  . . . . . . . . . . . . . . . . .  19
       5.1.7.  flowId  . . . . . . . . . . . . . . . . . . . . . . .  19
       5.1.8.  templateId  . . . . . . . . . . . . . . . . . . . . .  20
       5.1.9.  sourceId  . . . . . . . . . . . . . . . . . . . . . .  20
     5.2.  Metering and Exporting Process Properties . . . . . . . .  20



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       5.2.1.  exporterIPv4Address . . . . . . . . . . . . . . . . .  21
       5.2.2.  exporterIPv6Address . . . . . . . . . . . . . . . . .  21
       5.2.3.  exportedMessageTotalCount . . . . . . . . . . . . . .  21
       5.2.4.  exportedOctetTotalCount . . . . . . . . . . . . . . .  21
       5.2.5.  exportedFlowTotalCount  . . . . . . . . . . . . . . .  22
       5.2.6.  observedFlowTotalCount  . . . . . . . . . . . . . . .  22
       5.2.7.  ignoredPacketTotalCount . . . . . . . . . . . . . . .  22
       5.2.8.  ignoredOctetTotalCount  . . . . . . . . . . . . . . .  22
       5.2.9.  notSentFlowTotalCount . . . . . . . . . . . . . . . .  23
       5.2.10. notSentPacketTotalCount . . . . . . . . . . . . . . .  23
       5.2.11. notSentOctetTotalCount  . . . . . . . . . . . . . . .  23
       5.2.12. flowKeyIndicator  . . . . . . . . . . . . . . . . . .  24
     5.3.  IP Header Fields  . . . . . . . . . . . . . . . . . . . .  24
       5.3.1.  ipVersion . . . . . . . . . . . . . . . . . . . . . .  25
       5.3.2.  sourceIPv4Address . . . . . . . . . . . . . . . . . .  25
       5.3.3.  sourceIPv6Address . . . . . . . . . . . . . . . . . .  26
       5.3.4.  sourceIPv4Mask  . . . . . . . . . . . . . . . . . . .  26
       5.3.5.  sourceIPv6Mask  . . . . . . . . . . . . . . . . . . .  26
       5.3.6.  sourceIPv4Prefix  . . . . . . . . . . . . . . . . . .  26
       5.3.7.  sourceIPv6Prefix  . . . . . . . . . . . . . . . . . .  26
       5.3.8.  destinationIPv4Address  . . . . . . . . . . . . . . .  27
       5.3.9.  destinationIPv6Address  . . . . . . . . . . . . . . .  27
       5.3.10. destinationIPv4Mask . . . . . . . . . . . . . . . . .  27
       5.3.11. destinationIPv6Mask . . . . . . . . . . . . . . . . .  27
       5.3.12. destinationIPv4Prefix . . . . . . . . . . . . . . . .  28
       5.3.13. destinationIPv6Prefix . . . . . . . . . . . . . . . .  28
       5.3.14. ipTimeToLive  . . . . . . . . . . . . . . . . . . . .  28
       5.3.15. protocolIdentifier  . . . . . . . . . . . . . . . . .  28
       5.3.16. nextHeaderIPv6  . . . . . . . . . . . . . . . . . . .  29
       5.3.17. ipClassOfService  . . . . . . . . . . . . . . . . . .  29
       5.3.18. ipDiffServCodePoint . . . . . . . . . . . . . . . . .  29
       5.3.19. ipPrecedence  . . . . . . . . . . . . . . . . . . . .  30
       5.3.20. classOfServiceIPv4  . . . . . . . . . . . . . . . . .  30
       5.3.21. postClassOfServiceIPv4  . . . . . . . . . . . . . . .  30
       5.3.22. classOfServiceIPv6  . . . . . . . . . . . . . . . . .  31
       5.3.23. postClassOfServiceIPv6  . . . . . . . . . . . . . . .  31
       5.3.24. flowLabelIPv6 . . . . . . . . . . . . . . . . . . . .  31
       5.3.25. isMulticast . . . . . . . . . . . . . . . . . . . . .  32
       5.3.26. identificationIPv4  . . . . . . . . . . . . . . . . .  32
       5.3.27. fragmentOffsetIPv4  . . . . . . . . . . . . . . . . .  33
       5.3.28. fragmentFlagsIPv4 . . . . . . . . . . . . . . . . . .  33
       5.3.29. ipHeaderLength  . . . . . . . . . . . . . . . . . . .  33
       5.3.30. headerLengthIPv4  . . . . . . . . . . . . . . . . . .  34
       5.3.31. internetHeaderLengthIPv4  . . . . . . . . . . . . . .  34
       5.3.32. totalLengthIPv4 . . . . . . . . . . . . . . . . . . .  34
       5.3.33. payloadLengthIPv6 . . . . . . . . . . . . . . . . . .  35
       5.3.34. ipPayloadLength . . . . . . . . . . . . . . . . . . .  35
     5.4.  Transport Header Fields . . . . . . . . . . . . . . . . .  35



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       5.4.1.  sourceTransportPort . . . . . . . . . . . . . . . . .  36
       5.4.2.  destinationTransportPort  . . . . . . . . . . . . . .  36
       5.4.3.  udpSourcePort . . . . . . . . . . . . . . . . . . . .  37
       5.4.4.  udpDestinationPort  . . . . . . . . . . . . . . . . .  37
       5.4.5.  udpMessageLength  . . . . . . . . . . . . . . . . . .  37
       5.4.6.  tcpSourcePort . . . . . . . . . . . . . . . . . . . .  37
       5.4.7.  tcpDestinationPort  . . . . . . . . . . . . . . . . .  38
       5.4.8.  tcpSequenceNumber . . . . . . . . . . . . . . . . . .  38
       5.4.9.  tcpAcknowledgementNumber  . . . . . . . . . . . . . .  38
       5.4.10. tcpWindowSize . . . . . . . . . . . . . . . . . . . .  38
       5.4.11. tcpUrgentPointer  . . . . . . . . . . . . . . . . . .  38
       5.4.12. tcpHeaderLength . . . . . . . . . . . . . . . . . . .  39
       5.4.13. icmpTypeCodeIPv4  . . . . . . . . . . . . . . . . . .  39
       5.4.14. icmpTypeIPv4  . . . . . . . . . . . . . . . . . . . .  39
       5.4.15. icmpCodeIPv4  . . . . . . . . . . . . . . . . . . . .  39
       5.4.16. icmpTypeCodeIPv6  . . . . . . . . . . . . . . . . . .  40
       5.4.17. icmpTypeIPv6  . . . . . . . . . . . . . . . . . . . .  40
       5.4.18. icmpCodeIPv6  . . . . . . . . . . . . . . . . . . . .  40
       5.4.19. igmpType  . . . . . . . . . . . . . . . . . . . . . .  40
     5.5.  Sub-IP Header Fields  . . . . . . . . . . . . . . . . . .  40
       5.5.1.  sourceMacAddress  . . . . . . . . . . . . . . . . . .  41
       5.5.2.  postSourceMacAddress  . . . . . . . . . . . . . . . .  41
       5.5.3.  vlanId  . . . . . . . . . . . . . . . . . . . . . . .  41
       5.5.4.  postVlanId  . . . . . . . . . . . . . . . . . . . . .  42
       5.5.5.  destinationMacAddress . . . . . . . . . . . . . . . .  42
       5.5.6.  postDestinationMacAddr  . . . . . . . . . . . . . . .  42
       5.5.7.  wlanChannelId . . . . . . . . . . . . . . . . . . . .  42
       5.5.8.  wlanSsid  . . . . . . . . . . . . . . . . . . . . . .  43
       5.5.9.  mplsTopLabelTtl . . . . . . . . . . . . . . . . . . .  43
       5.5.10. mplsTopLabelExp . . . . . . . . . . . . . . . . . . .  43
       5.5.11. mplsLabelStackDepth . . . . . . . . . . . . . . . . .  44
       5.5.12. mplsLabelStackLength  . . . . . . . . . . . . . . . .  44
       5.5.13. mplsPayloadLength . . . . . . . . . . . . . . . . . .  44
       5.5.14. mplsTopLabelStackEntry  . . . . . . . . . . . . . . .  44
       5.5.15. mplsLabelStackEntry2  . . . . . . . . . . . . . . . .  45
       5.5.16. mplsLabelStackEntry3  . . . . . . . . . . . . . . . .  45
       5.5.17. mplsLabelStackEntry4  . . . . . . . . . . . . . . . .  45
       5.5.18. mplsLabelStackEntry5  . . . . . . . . . . . . . . . .  46
       5.5.19. mplsLabelStackEntry6  . . . . . . . . . . . . . . . .  46
       5.5.20. mplsLabelStackEntry7  . . . . . . . . . . . . . . . .  46
       5.5.21. mplsLabelStackEntry8  . . . . . . . . . . . . . . . .  47
       5.5.22. mplsLabelStackEntry9  . . . . . . . . . . . . . . . .  47
       5.5.23. mplsLabelStackEntry10 . . . . . . . . . . . . . . . .  47
     5.6.  Derived Packet Properties . . . . . . . . . . . . . . . .  47
       5.6.1.  ipNextHopIPv4Address  . . . . . . . . . . . . . . . .  48
       5.6.2.  ipNextHopIPv6Address  . . . . . . . . . . . . . . . .  48
       5.6.3.  bgpSourceAsNumber . . . . . . . . . . . . . . . . . .  48
       5.6.4.  bgpDestinationAsNumber  . . . . . . . . . . . . . . .  49



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       5.6.5.  bgpNextAdjacentAsNumber . . . . . . . . . . . . . . .  49
       5.6.6.  bgpPrevAdjacentAsNumber . . . . . . . . . . . . . . .  49
       5.6.7.  bgpNextHopIPv4Address . . . . . . . . . . . . . . . .  50
       5.6.8.  bgpNextHopIPv6Address . . . . . . . . . . . . . . . .  50
       5.6.9.  mplsTopLabelType  . . . . . . . . . . . . . . . . . .  50
       5.6.10. mplsTopLabelIPv4Address . . . . . . . . . . . . . . .  50
       5.6.11. mplsTopLabelIPv6Address . . . . . . . . . . . . . . .  51
     5.7.  Min/Max Flow Properties . . . . . . . . . . . . . . . . .  51
       5.7.1.  minimumPacketLength . . . . . . . . . . . . . . . . .  51
       5.7.2.  maximumPacketLength . . . . . . . . . . . . . . . . .  51
       5.7.3.  minimumTtl  . . . . . . . . . . . . . . . . . . . . .  52
       5.7.4.  maximumTtl  . . . . . . . . . . . . . . . . . . . . .  52
       5.7.5.  ipv4Options . . . . . . . . . . . . . . . . . . . . .  52
       5.7.6.  ipv6ExtensionHeaders  . . . . . . . . . . . . . . . .  54
       5.7.7.  tcpControlBits  . . . . . . . . . . . . . . . . . . .  56
       5.7.8.  tcpOptions  . . . . . . . . . . . . . . . . . . . . .  56
     5.8.  Flow Time Stamps  . . . . . . . . . . . . . . . . . . . .  57
       5.8.1.  flowStartSeconds  . . . . . . . . . . . . . . . . . .  57
       5.8.2.  flowEndSeconds  . . . . . . . . . . . . . . . . . . .  58
       5.8.3.  flowStartMilliSeconds . . . . . . . . . . . . . . . .  58
       5.8.4.  flowEndMilliSeconds . . . . . . . . . . . . . . . . .  58
       5.8.5.  flowStartMicroSeconds . . . . . . . . . . . . . . . .  58
       5.8.6.  flowEndMicroSeconds . . . . . . . . . . . . . . . . .  58
       5.8.7.  flowStartNanoSeconds  . . . . . . . . . . . . . . . .  58
       5.8.8.  flowEndNanoSeconds  . . . . . . . . . . . . . . . . .  59
       5.8.9.  flowStartDeltaMicroSeconds  . . . . . . . . . . . . .  59
       5.8.10. flowEndDeltaMicroSeconds  . . . . . . . . . . . . . .  59
       5.8.11. systemInitTimeMilliSeconds  . . . . . . . . . . . . .  59
       5.8.12. flowStartSysUpTime  . . . . . . . . . . . . . . . . .  60
       5.8.13. flowEndSysUpTime  . . . . . . . . . . . . . . . . . .  60
     5.9.  Per-Flow Counters . . . . . . . . . . . . . . . . . . . .  60
       5.9.1.  octetDeltaCount . . . . . . . . . . . . . . . . . . .  61
       5.9.2.  postOctetDeltaCount . . . . . . . . . . . . . . . . .  61
       5.9.3.  octetDeltaSumOfSquares  . . . . . . . . . . . . . . .  61
       5.9.4.  octetTotalCount . . . . . . . . . . . . . . . . . . .  62
       5.9.5.  postOctetTotalCount . . . . . . . . . . . . . . . . .  62
       5.9.6.  octetTotalSumOfSquares  . . . . . . . . . . . . . . .  62
       5.9.7.  packetDeltaCount  . . . . . . . . . . . . . . . . . .  62
       5.9.8.  postPacketDeltaCount  . . . . . . . . . . . . . . . .  63
       5.9.9.  packetTotalCount  . . . . . . . . . . . . . . . . . .  63
       5.9.10. postPacketTotalCount  . . . . . . . . . . . . . . . .  63
       5.9.11. droppedOctetDeltaCount  . . . . . . . . . . . . . . .  64
       5.9.12. droppedPacketDeltaCount . . . . . . . . . . . . . . .  64
       5.9.13. droppedOctetTotalCount  . . . . . . . . . . . . . . .  64
       5.9.14. droppedPacketTotalCount . . . . . . . . . . . . . . .  64
       5.9.15. postMCastPacketDeltaCount . . . . . . . . . . . . . .  65
       5.9.16. postMCastOctetDeltaCount  . . . . . . . . . . . . . .  65
       5.9.17. postMCastPacketTotalCount . . . . . . . . . . . . . .  65



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       5.9.18. postMCastOctetTotalCount  . . . . . . . . . . . . . .  66
     5.10. Miscellaneous Flow Properties . . . . . . . . . . . . . .  66
       5.10.1. flowActiveTimeOut . . . . . . . . . . . . . . . . . .  66
       5.10.2. flowInactiveTimeout . . . . . . . . . . . . . . . . .  66
       5.10.3. flowEndReason . . . . . . . . . . . . . . . . . . . .  67
       5.10.4. flowDurationMilliSeconds  . . . . . . . . . . . . . .  67
       5.10.5. flowDurationMicroSeconds  . . . . . . . . . . . . . .  68
     5.11. Padding . . . . . . . . . . . . . . . . . . . . . . . . .  68
       5.11.1. paddingOctets . . . . . . . . . . . . . . . . . . . .  68
   6.  Extending the Information Model . . . . . . . . . . . . . . .  68
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  69
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  70
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  70
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  70
     10.1. Normative References  . . . . . . . . . . . . . . . . . .  70
     10.2. Informative References  . . . . . . . . . . . . . . . . .  70
   Appendix A.  Formal Specification of IPFIX Information Element  .  73
   Appendix B.  Formal Specification of Abstract Data Types  . . . . 127
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . 139
   Intellectual Property and Copyright Statements  . . . . . . . . . 140































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1.  Introduction

   The IP Flow Information eXport (IPFIX) protocol serves for
   transmitting information related to measured IP traffic over the
   Internet.  The protocol specification in [I-D.ietf-ipfix-protocol]
   defines how Information Elements are transmitted.  For Information
   Elements, it specifies the encoding of a set of basic data types.
   However, the list of Information Elements that can be transmitted by
   the protocol, such as Flow attributes (source IP address, number of
   packets, etc.) and information about the Metering and Exporting
   Process (packet Observation Point, sampling rate, Flow timeout
   interval, etc.), is not specified in [I-D.ietf-ipfix-protocol].

   This document complements the IPFIX protocol specification by
   providing the IPFIX information model.  IPFIX-specific terminology
   used in this document is defined in section 3 of [I-D.ietf-ipfix-
   protocol].  As in [I-D.ietf-ipfix-protocol], these IPFIX-specific
   terms have the first letter of a word capitalized when used in this
   document.

   The main part of this document is section 5 defining the (extensible)
   list of Information Elements to be transmitted by the IPFIX protocol.
   Section 2 defines a template for specifying IPFIX Information
   Elements in section 4.  Section 3 defines the set of abstract data
   types that are available for IPFIX Information Elements.  Section 5
   discusses extensibility of the IPFIX information model.

   The main bodies of sections 2, 3 and 4 were generated from XML
   documents.  The XML-based specification of template, abstract data
   types and IPFIX Information Elements can be used for automatically
   checking syntactical correctness of the specification of IPFIX
   Information Elements.  It can further be used for generating IPFIX
   protocol implementation code that deals with processing IPFIX
   Information Elements.  Also code for applications that further
   process traffic information transmitted via the IPFIX protocol can be
   generated with the XML specification of IPFIX Information Elements.

   For that reason, the XML document that served as source for section 4
   and the XML schema that served as source for sections 2 and 3 are
   attached to this document in Appendices A and B.

   Note that although partially generated from the attached XML
   documents, the main body of this document is normative while the
   appendices are informational.


2.  Properties of IPFIX Protocol Information Elements




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2.1.  Information Elements Specification Template

   Information in messages of the IPFIX protocol is modeled in terms of
   Information Elements of the IPFIX information model.  IPFIX
   Information Elements are specified in section 4.  For specifying
   these Information Elements, a template is used that is described
   below.

   All Information Elements specified for the IPFIX protocol either in
   this document or by any future extension MUST have the following
   properties defined:

   name - A unique and meaningful name for the Information Element.

   description - The semantics of this Information Element.  Describes
      how this Information Element is derived from the Flow or other
      information available to the observer.

   dataType - One of the types listed in section 3.1 of this document or
      in a future extension of the information model.  The type space
      for attributes is constrained to facilitate implementation.  The
      existing type space does however encompass most basic types used
      in modern programming languages, as well as some derived types
      (such as ipv4Address) which are common to this domain and useful
      to distinguish.

   status - The status of the specification of this Information Element.
      Allowed values are 'current', 'deprecated', and 'obsolete'.


   Enterprise-specific Information Elements MUST have the following
   property defined:

   enterpriseId - Enterprises may wish to define Information Elements
      without registering them with IANA, for example for enterprise-
      internal purposes.  For such Information Elements the Information
      Element identifier described above is not sufficient when the
      Information Element is used outside the enterprise.  If
      specifications of enterprise-specific Information Elements are
      made public and/or if enterprise-specific identifiers are used by
      the IPFIX protocol outside the enterprise, then the enterprise-
      specific identifier MUST be made globally unique by combining it
      with an enterprise identifier.  Valid values for the enterpriseId
      are defined by IANA as SMI network management private enterprise
      codes.  They are defined at
      http://www.iana.org/assignments/enterprise-numbers.





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   All Information Elements specified for the IPFIX protocol either in
   this document or by any future extension MAY have the following
   properties defined:

   dataTypeSemantics - The integral types may be qualified by additional
      semantic details.  Valid values for the data type semantics are
      specified in section 3.2 of this document or in a future extension
      of the information model.

   units - If the Information Element is a measure of some kind, the
      units identify what the measure is.

   range - Some Information Elements may only be able to take on a
      restricted set of values which can be expressed as a range (e.g. 0
      through 511 inclusive).  If this is the case, the valid inclusive
      range should be specified.

   reference - Identifies additional specifications which more precisely
      define this item or provide additional context for its use.


2.2.  Scope of Information Elements

   By default, most Information Elements have a scope specified in their
   definitions.

   o  The Information Elements defined in section 5.2 have a default of
      "a specific Metering Process" or of "a specific Exporting
      Process", respectively.
   o  The Information Elements defined in sections 5.3 - 5.9 have a
      scope of "a specific Flow".

   Within Data Records defined by Option Templates, the IPFIX protocol
   allows further limiting of the Information Element scope.  The new
   scope is specified by one or more scope fields and defined as the
   combination of all specified scope values.

2.3.  Naming Conventions for Information Elements

   The following naming conventions were used for naming Information
   Elements in this document.  It is recommended that extensions of the
   model use the same conventions.

   o  Names of Information Elements start with non-capitalized letters.





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   o  Composed names use capital letters for the first letter of each
      component (except for the first one).  All other letters are non-
      capitalized, even for acronyms.  Exceptions are made for acronyms
      containing non-capitalized letter, such as 'IPv4' and 'IPv6'.
      Examples are sourceMacAddress and destinationIPv4Address.
   o  Middleboxes [RFC3234] may change Flow properties, such as the DSCP
      value or the source IP address.  If an IPFIX Observation Point is
      located in the path of a Flow before one or more middleboxes that
      potentially modify packets of the Flow, then it may be desirable
      to report also flow properties after the modification performed by
      the middleboxes.  An example is an observation point before a
      packet marker changing a packet's IPv4 TOS field that is encoded
      in Information Element classOfServiceIPv4.  Then the value
      observed and reported by Information Element classOfServiceIPv4 is
      valid at the observation point, but not anymore after the packet
      passed the packet marker.  For reporting the change value of the
      TOS field, the IPFIX information model uses Information Elements
      that have a name prefix "post", for example,
      "postClassOfServiceIPv4".  Information Elements with prefix "post"
      report on Flow properties that are not necessarily observed at the
      observation point, but which are obtained withing the Flow's
      Observation Domain by other means that are considered to be
      sufficiently reliable, for example, by analyzing the packet
      marker's marking tables.


3.  Type Space

   This section describes the abstract data types that can be used for
   the specification of IPFIX Information Elements in section 4.
   Section 3.1 describes the set of data types.

   Data types octet, unsigned16, unsigned32, and unsigned64 are integral
   data types.  As described in section 3.2, their data type semantics
   can be further specified, for example, by 'totalCounter',
   'deltaCounter', 'identifier' or 'flags'.

3.1.  Data Types

   This section describes the set of valid data types of the IPFIX
   information model.  Note that further data types may be specified by
   future protocol extensions.

3.1.1.  octet

   The type "octet" represents a non-negative integer value in the range
   of 0 to 255.




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3.1.2.  unsigned16

   The type "unsigned16" represents a non-negative integer value in the
   range of 0 to 65535.

3.1.3.  unsigned32

   The type "unsigned32" represents a non-negative integer value in the
   range of 0 to 4294967295.

3.1.4.  unsigned64

   The type "unsigned64" represents a non-negative integer value in the
   range of 0 to 18446744073709551615.

3.1.5.  float32

   The type "float32" corresponds to an IEEE single-precision 32-bit
   floating point type as defined in [IEEE.754.1985].

3.1.6.  boolean

   The type "boolean" represents a binary value.  The only allowed
   values are "true" and false.

3.1.7.  macAddress

   The type "macAddress" represents a string of 6 octets.

3.1.8.  octetArray

   The type "octetArray" represents a finite length string of octets.

3.1.9.  string

   The type "string" represents a finite length string of valid
   characters from the Unicode character encoding set [ISO.10646-
   1.1993].  Unicode allows for ASCII [ISO.646.1991] and many other
   international character sets to be used.  It is expected that strings
   will be encoded in UTF-8 format, which is identical in encoding for
   ASCII characters, but also accommodates other Unicode multi-byte
   characters.

3.1.10.  dateTimeSeconds

   The type "dateTimeSeconds" represents a time value in units of
   seconds normalized to the GMT time zone.




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3.1.11.  dateTimeMilliSeconds

   The type "dateTimeMilliSeconds" represents a time value in units of
   milliseconds normalized to the GMT time zone.

3.1.12.  dateTimeMicroSeconds

   The type "dateTimeMicroSeconds" represents a time value in units of
   microseconds normalized to the GMT time zone.

3.1.13.  dateTimeNanoSeconds

   The type "dateTimeNanoSeconds" represents a time value in units of
   nanoseconds normalized to the GMT time zone.

3.1.14.  ipv4Address

   The type "ipv4Address" represents a value of an IPv4 address.

3.1.15.  ipv6Address

   The type "ipv6Address" represents a value of an IPv6 address.

3.2.  Data Type Semantics

   This section describes the set of valid data type semantics of the
   IPFIX information model.  Note that further data type semantics may
   be specified by future protocol extensions.

3.2.1.  quantity

   A quantity value represents a discrete measured value pertaining to
   the record.  This is distinguished from counters which represent an
   ongoing measured value whose "odometer" reading is captured as part
   of a given record.  If no semantic qualifier is given, the
   Information Elements that have an integral data type should behave as
   a quantity.

3.2.2.  totalCounter

   An integral value reporting the value of a counter.  Basically the
   same semantics as counters in SNMP.  Counters are unsigned and wrap
   back to zero after reaching the limit of the type.  For example, an
   unsigned64 with counter semantics will continue to increment until
   reaching the value of 2**64 - 1.  At this point the next increment
   will wrap its value to zero and continue counting from zero.  A
   running counter counts independently of the export of its value.




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3.2.3.  deltaCounter

   An integral value reporting the value of a counter.  Basically the
   same semantics as counters in SNMP.  Counters are unsigned and wrap
   back to zero after reaching the limit of the type.  For example, an
   unsigned64 with counter semantics will continue to increment until
   reaching the value of 2**64 - 1.  At this point the next increment
   will wrap its value to zero and continue counting from zero.  A delta
   counter is reset to zero each time its value is exported.

3.2.4.  identifier

   An integral value which serves as an identifier.  Specifically
   mathematical operations on two identifiers (aside from the equality
   operation) are meaningless.  For example, Autonomous System ID 1 *
   Autonomous System ID 2 is meaningless.

3.2.5.  flags

   An integral value which actually represents a set of bit fields.
   Logical operations are appropriate on such values, but not other
   mathematical operations.  Flags should always be of an unsigned type.


4.  Information Element Identifiers

   All Information Elements defined in section 5 of this document or in
   future extensions of the IPFIX information model have their
   identifiers assigned by IANA.  Their identifiers can be retrieved at
   http://www.iana.org/assignments/ipfix-element-numbers.

   EDITORIAL NOTE: this URL needs probably to be updated after IANA
   created a URL for IPFIX Information Elements

   The value of these identifiers are in the range of 1 - 32767.  Within
   this range, Information Element identifier values in the sub-range of
   1-127 are compatible with field types used by NetFlow version 9
   [RFC3954].













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   +---------------------------------+---------------------------------+
   | Range of IANA-assigned          | Description                     |
   | Information Element identifiers |                                 |
   +---------------------------------+---------------------------------+
   | 0                               | Reserved.                       |
   | 1 - 127                         | Information Element identifiers |
   |                                 | compatible with NetFlow version |
   |                                 | 9 field types [RFC3954].        |
   | 128 - 32767                     | Further Information Element     |
   |                                 | identifiers.                    |
   +---------------------------------+---------------------------------+

   Enterprise-specific Information Element identifiers have the same
   range of 1-32767, but they are coupled with an additional enterprise
   identifier.

   Enterprise-specific Information Element identifiers can be chosen by
   an enterprise arbitrarily within the range of 1-32767.  The same
   identifier may be assigned by other enterprises for different
   purposes.

   Still, Collecting Processes can distinguish these Information
   Elements because the Information Element identifier is coupled with
   an enterprise identifier.

   Enterprise identifiers MUST be registered as SMI network management
   private enterprise code numbers with IANA.  The registry can be found
   at http://www.iana.org/assignments/enterprise-numbers.

   The following list gives an overview of the Information Element
   identifiers that are specified in section 5 and are compatible with
   field types used by NetFlow version 9 [RFC3954].



















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   +-------+-------------------------+-------+-------------------------+
   |    ID | Name                    |    ID | Name                    |
   +-------+-------------------------+-------+-------------------------+
   |     1 | octetDeltaCount         |    43 | RESERVED                |
   |     2 | packetDeltaCount        |    44 | sourceIPv4Prefix        |
   |     3 | RESERVED                |    45 | destinationIPv4Prefix   |
   |     4 | protocolIdentifier      |    46 | mplsTopLabelType        |
   |     5 | classOfServiceIPv4      |    47 | mplsTopLabelIPv4Address |
   |     6 | tcpControlBits          | 48-51 | RESERVED                |
   |     7 | sourceTransportPort     |    52 | minimumTtl              |
   |     8 | sourceIPv4Address       |    53 | maximumTtl              |
   |     9 | sourceIPv4Mask          |    54 | identificationIPv4      |
   |    10 | ingressInterface        |    55 | postClassOfServiceIPv4  |
   |    11 | destinationTransportPort|    56 | sourceMacAddress        |
   |    12 | destinationIPv4Address  |    57 | postDestinationMacAddr  |
   |    13 | destinationIPv4Mask     |    58 | vlanId                  |
   |    14 | egressInterface         |    59 | postVlanId              |
   |    15 | ipNextHopIPv4Address    |    60 | ipVersion               |
   |    16 | bgpSourceAsNumber       |    61 | RESERVED                |
   |    17 | bgpDestinationAsNumber  |    62 | ipNextHopIPv6Address    |
   |    18 | bgpNexthopIPv4Address   |    63 | bgpNexthopIPv6Address   |
   |    19 | postMCastPacketDeltaCount|   64 | ipv6ExtensionHeaders    |
   |    20 | postMCastOctetDeltaCount| 65-69 | RESERVED                |
   |    21 | flowEndSysUpTime        |    70 | mplsTopLabelStackEntry  |
   |    22 | flowStartSysUpTime      |    71 | mplsLabelStackEntry2    |
   |    23 | postOctetDeltaCount     |    72 | mplsLabelStackEntry3    |
   |    24 | postPacketDeltaCount    |    73 | mplsLabelStackEntry4    |
   |    25 | minimumPacketLength     |    74 | mplsLabelStackEntry5    |
   |    26 | maximumPacketLength     |    75 | mplsLabelStackEntry6    |
   |    27 | sourceIPv6Address       |    76 | mplsLabelStackEntry7    |
   |    28 | destinationIPv6Address  |    77 | mplsLabelStackEntry8    |
   |    29 | sourceIPv6Mask          |    78 | mplsLabelStackEntry9    |
   |    30 | destinationIPv6Mask     |    79 | mplsLabelStackEntry10   |
   |    31 | flowLabelIPv6           |    80 | destinationMacAddress   |
   |    32 | icmpTypeCodeIPv4        |    81 | postSourceMacAddress    |
   |    33 | igmpType                | 82-84 | RESERVED                |
   | 34-35 | RESERVED                |    85 | octetTotalCount         |
   |    36 | flowActiveTimeOut       |    86 | packetTotalCount        |
   |    37 | flowInactiveTimeout     |    87 | RESERVED                |
   | 38-39 | RESERVED                |    88 | fragmentOffsetIPv4      |
   |    40 | exportedOctetTotalCount |89-127 | RESERVED                |
   |    41 | exportedMessageTotalCount|      |                         |
   |    42 | exportedFlowTotalCount  |       |                         |
   +-------+-------------------------+-------+-------------------------+

   The following list gives an overview of the Information Element
   identifiers that are specified in section 5 and extend the list of
   Information Element identifiers specified already in [RFC3954].



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   +-----+---------------------------+-----+---------------------------+
   |  ID | Name                      |  ID | Name                      |
   +-----+---------------------------+-----+---------------------------+
   | 128 | bgpNextAdjacentAsNumber   | 172 | postPacketTotalCount      |
   | 129 | bgpPrevAdjacentAsNumber   | 173 | flowKeyIndicator          |
   | 130 | exporterIPv4Address       | 174 | postMCastPacketTotalCount |
   | 131 | exporterIPv6Address       | 175 | postMCastOctetTotalCount  |
   | 132 | droppedOctetDeltaCount    | 176 | icmpTypeIPv4              |
   | 133 | droppedPacketDeltaCount   | 177 | icmpCodeIPv4              |
   | 134 | droppedOctetTotalCount    | 178 | icmpTypeIPv6              |
   | 135 | droppedPacketTotalCount   | 179 | icmpCodeIPv6              |
   | 136 | flowEndReason             | 180 | udpSourcePort             |
   | 137 | classOfServiceIPv6        | 181 | udpDestinationPort        |
   | 138 | postClassOfServiceIPv6    | 182 | tcpSourcePort             |
   | 139 | icmpTypeCodeIPv6          | 183 | tcpDestinationPort        |
   | 140 | mplsTopLabelIPv6Address   | 184 | tcpSequenceNumber         |
   | 141 | lineCardId                | 185 | tcpAcknowledgementNumber  |
   | 142 | portId                    | 186 | tcpWindowSize             |
   | 143 | meteringProcessId         | 187 | tcpUrgentPointer          |
   | 144 | exportingProcessId        | 188 | tcpHeaderLength           |
   | 145 | templateId                | 189 | ipHeaderLength            |
   | 146 | wlanChannelId             | 190 | totalLengthIPv4           |
   | 147 | wlanSsid                  | 191 | payloadLengthIPv6         |
   | 148 | flowId                    | 192 | ipTimeToLive              |
   | 149 | sourceId                  | 193 | nextHeaderIPv6            |
   | 150 | flowStartSeconds          | 194 | ipClassOfService          |
   | 151 | flowEndSeconds            | 195 | ipDiffServCodePoint       |
   | 152 | flowStartMilliSeconds     | 196 | ipPrecedence              |
   | 153 | flowEndMilliSeconds       | 197 | fragmentFlagsIPv4         |
   | 154 | flowStartMicroSeconds     | 198 | octetDeltaSumOfSquares    |
   | 155 | flowEndMicroSeconds       | 199 | octetTotalSumOfSquares    |
   | 156 | flowStartNanoSeconds      | 200 | mplsTopLabelTtl           |
   | 157 | flowEndNanoSeconds        | 201 | mplsLabelStackLength      |
   | 158 | flowStartDeltaMicroSeconds| 202 | mplsLabelStackDepth       |
   | 159 | flowEndDeltaMicroSeconds  | 203 | mplsTopLabelExp           |
   | 160 | systemInitTimeMilliSeconds| 204 | ipPayloadLength           |
   | 161 | flowDurationMilliSeconds  | 205 | udpMessageLength          |
   | 162 | flowDurationMicroSeconds  | 206 | isMulticast               |
   | 163 | observedFlowTotalCount    | 207 | internetHeaderLengthIPv4  |
   | 164 | ignoredPacketTotalCount   | 208 | ipv4Options               |
   | 165 | ignoredOctetTotalCount    | 209 | tcpOptions                |
   | 166 | notSentFlowTotalCount     | 210 | paddingOctets             |
   | 167 | notSentPacketTotalCount   | 211 |                           |
   | 168 | notSentOctetTotalCount    | 212 |                           |
   | 169 | destinationIPv6Prefix     | 213 | headerLengthIPv4          |
   | 170 | sourceIPv6Prefix          | 214 | mplsPayloadLength         |
   | 171 | postOctetTotalCount       |     |                           |
   +-----+---------------------------+-----+---------------------------+



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   Information Element identifiers 211-212 are already in use by some
   implementations, but their descriptions were not agreed when this
   document was edited.


5.  Information Elements

   This section describes the Flow attributes of the IPFIX information
   model.  The elements are grouped into 9 groups according to their
   semantics and their applicability:

   1.   Identifiers
   2.   Metering and Exporting Process Properties
   3.   IP Header Fields
   4.   Transport Header Fields
   5.   Sub-IP Header Fields
   6.   Derived Packet Properties
   7.   Min/Max Flow Properties
   8.   Flow Time Stamps
   9.   Per-Flow Counters
   10.  Miscellaneous Flow Properties

   The Information Elements that are derived from fields of packets or
   from packet treatment, such as the Information Elements in groups
   3.-6., can serve as Flow Keys used for mapping packets to Flows.

   If they do not serve as Flow Keys, their value may change from packet
   to packet within a single Flow.  For Information Elements with values
   that are derived from fields of packets or from packet treatment and
   for which the value may change from packet to packet within a single
   Flow, the IPFIX information model defines that their value is
   determined by the first packet observed for the corresponding Flow,
   unless the description of the Information Element explicitly
   specifies a different semantics.  This simple rule allows writing all
   Information Elements related to header fields once when the first
   packet of the Flow is observed.  For further observed packets of the
   same Flow, only Flow properties that depend on more than one packet,
   such as the Information Elements in groups 7.-9., need to be updated.

   Information Elements with a name having the "post" prefix, for
   example, "postClassOfServiceIPv4", do not report properties that were
   actually observed at the Observation Point, but retrieved by other
   means within the Observation Domain.  These information Elements can
   be used if there are middlebox functions within the Observation
   Domain changing Flow properties after packets passed the Observation
   Point.





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5.1.  Identifiers

   Information Elements grouped in the table below are identifying
   components of the IPFIX architecture, of an IPFIX Device, or of the
   IPFIX protocol.  All of them have an integral data type and data type
   semantics "identifier" as described in section 3.2.4.

   Typically, some of them are used for limiting scopes of other
   Information Elements.  However, also other Information Elements MAY
   be used for limiting scopes.  Note also that all Information Elements
   listed below MAY be used for other purposes than limiting scopes.

   +-----+---------------------------+-----+---------------------------+
   |  ID | Name                      |  ID | Name                      |
   +-----+---------------------------+-----+---------------------------+
   | 141 | lineCardId                | 143 | meteringProcessId         |
   | 142 | portId                    | 144 | exportingProcessId        |
   |  10 | ingressInterface          | 148 | flowId                    |
   |  14 | egressInterface           | 145 | templateId                |
   |     |                           | 149 | sourceId                  |
   +-----+---------------------------+-----+---------------------------+

5.1.1.  lineCardId

   Description:
      A locally unique identifier of a line card at an IPFIX Device
      hosting an Observation Point.  Typically, this Information Element
      is used for limiting the scope of other Information Elements.
   Abstract Data Type: unsigned32
   Data Type Semantics: identifier
   ElementId: 141
   Status: current

5.1.2.  portId

   Description:
      A locally unique identifier of a line port at an IPFIX Device
      hosting an Observation Point.  Typically, this Information Element
      is used for limiting the scope of other Information Elements.
   Abstract Data Type: unsigned32
   Data Type Semantics: identifier
   ElementId: 142
   Status: current

5.1.3.  ingressInterface






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   Description:
      The index of the IP interface (ifIndex) where packets of this Flow
      are being received.
   Abstract Data Type: unsigned32
   Data Type Semantics: identifier
   ElementId: 10
   Status: current
   Reference: See RFC 2863 for the definition of the ifIndex object.

5.1.4.  egressInterface

   Description:
      The index of the IP interface (ifIndex) where packets of this Flow
      are being sent.
   Abstract Data Type: unsigned32
   Data Type Semantics: identifier
   ElementId: 14
   Status: current
   Reference: See RFC 2863 for the definition of the ifIndex object.

5.1.5.  meteringProcessId

   Description:
      A locally unique identifier of a Metering Process at an IPFIX
      Device.  Typically, this Information Element is used for limiting
      the scope of other Information Elements.
   Abstract Data Type: unsigned32
   Data Type Semantics: identifier
   ElementId: 143
   Status: current

5.1.6.  exportingProcessId

   Description:
      A locally unique identifier of an Exporting Process at an IPFIX
      Device.  Typically, this Information Element is used for limiting
      the scope of other Information Elements.
   Abstract Data Type: unsigned32
   Data Type Semantics: identifier
   ElementId: 144
   Status: current

5.1.7.  flowId








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   Description:
      An identifier of a Flow that is unique within an Observation
      Domain.  This Information Element can be used to distinguish
      between different Flows if Flow Keys such as IP addresses and port
      numbers are not reported or reported in separate records.
   Abstract Data Type: unsigned32
   Data Type Semantics: identifier
   ElementId: 148
   Status: current

5.1.8.  templateId

   Description:
      An identifier of a Template that is locally unique to an Exporting
      Process.  Typically, this Information Element is used for limiting
      the scope of other Information Elements.
   Abstract Data Type: unsigned16
   Data Type Semantics: identifier
   ElementId: 145
   Status: current

5.1.9.  sourceId

   Description:
      An identifier of an Observation Domain that is locally unique to
      an Exporting Process.  Typically, this Information Element is used
      for limiting the scope of other Information Elements.
   Abstract Data Type: unsigned32
   Data Type Semantics: identifier
   ElementId: 149
   Status: current

5.2.  Metering and Exporting Process Properties

   Information Elements in this section describe static and dynamic
   properties of the Metering Process and/or the Exporting Process.  The
   set of these Information Elements is listed in the table below

   +-----+---------------------------+-----+---------------------------+
   |  ID | Name                      |  ID | Name                      |
   +-----+---------------------------+-----+---------------------------+
   | 130 | exporterIPv4Address       | 164 | ignoredPacketTotalCount   |
   | 131 | exporterIPv6Address       | 165 | ignoredOctetTotalCount    |
   |  41 | exportedMessageTotalCount | 166 | notSentFlowTotalCount     |
   |  40 | exportedOctetTotalCount   | 167 | notSentPacketTotalCount   |
   |  42 | exportedFlowTotalCount    | 168 | notSentOctetTotalCount    |
   | 163 | observedFlowTotalCount    | 173 | flowKeyIndicator          |
   +-----+---------------------------+-----+---------------------------+



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5.2.1.  exporterIPv4Address

   Description:
      The IPv4 address used by the Exporting Process.  This is used by
      the Collector to identify the Exporter in cases where the identity
      of the Exporter may have been obscured by the use of a proxy.
   Abstract Data Type: ipv4Address
   Data Type Semantics: identifier
   ElementId: 130
   Status: current

5.2.2.  exporterIPv6Address

   Description:
      The IPv6 address used by the Exporting Process.  This is used by
      the Collector to identify the Exporter in cases where the identity
      of the Exporter may have been obscured by the use of a proxy.
   Abstract Data Type: ipv6Address
   Data Type Semantics: identifier
   ElementId: 131
   Status: current

5.2.3.  exportedMessageTotalCount

   Description:
      The total number of IPFIX Messages that the Exporting Process
      successfully sent since the Exporting Process (re-)initialization
      to the Collecting Process receiving a report that contains this
      Information Element.
   Abstract Data Type: unsigned64
   Data Type Semantics: totalCounter
   ElementId: 41
   Status: current
   Units: messages

5.2.4.  exportedOctetTotalCount

   Description:
      The total number of octets that the Exporting Process successfully
      sent since the Exporting Process (re-)initialization to the
      Collecting Process receiving a report that contains this
      Information Element.  The value of this Information Element is
      calculated by summing up the IPFIX Message header length values of
      all IPFIX Messages that were successfully sent to the Collecting
      Process receiving a report that contains this Information Element.






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   Abstract Data Type: unsigned64
   Data Type Semantics: totalCounter
   ElementId: 40
   Status: current
   Units: octets

5.2.5.  exportedFlowTotalCount

   Description:
      The total number of Flows Records that the Exporting Process
      successfully sent as Data Records since the Exporting Process
      (re-)initialization to the Collecting Process receiving a report
      that contains this Information Element.
   Abstract Data Type: unsigned64
   Data Type Semantics: totalCounter
   ElementId: 42
   Status: current
   Units: Flows

5.2.6.  observedFlowTotalCount

   Description:
      The total number of Flows observed in the Observation Domain since
      the Metering Process (re-)initialization for this Observation
      Point.
   Abstract Data Type: unsigned64
   Data Type Semantics: totalCounter
   ElementId: 163
   Status: current
   Units: Flows

5.2.7.  ignoredPacketTotalCount

   Description:
      The total number of observed IP packets that the Metering Process
      did not process since the (re-)initialization of the Metering
      Process.
   Abstract Data Type: unsigned64
   Data Type Semantics: totalCounter
   ElementId: 164
   Status: current
   Units: packets

5.2.8.  ignoredOctetTotalCount







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   Description:
      The total number of octets in observed IP packets that the
      Metering Process did not process since the (re-)initialization of
      the Metering Process.
   Abstract Data Type: unsigned64
   Data Type Semantics: totalCounter
   ElementId: 165
   Status: current
   Units: octets

5.2.9.  notSentFlowTotalCount

   Description:
      The total number of Flow Records that were generated by the
      Metering Process and but dropped by the Metering Process or by the
      Exporting Process instead of sending it to the Collecting Process.
      There are several potential reasons for this including resource
      shortage and special Flow export policies.
   Abstract Data Type: unsigned64
   Data Type Semantics: totalCounter
   ElementId: 166
   Status: current
   Units: Flows

5.2.10.  notSentPacketTotalCount

   Description:
      The total number of packets in Flow Records that were generated by
      the Metering Process and but dropped by the Metering Process or by
      the Exporting Process instead of sending it to the Collecting
      Process.  There are several potential reasons for this including
      resource shortage and special Flow export policies.
   Abstract Data Type: unsigned64
   Data Type Semantics: totalCounter
   ElementId: 167
   Status: current
   Units: packets

5.2.11.  notSentOctetTotalCount

   Description:
      The total number of octets in packets in Flow Records that were
      generated by the Metering Process and but dropped by the Metering
      Process or by the Exporting Process instead of sending it to the
      Collecting Process.  There are several potential reasons for this
      including resource shortage and special Flow export policies.





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   Abstract Data Type: unsigned64
   Data Type Semantics: totalCounter
   ElementId: 168
   Status: current
   Units: octets

5.2.12.  flowKeyIndicator

   Description:
      This set of bit fields is used for marking the Information
      Elements of a Data Record that serve as Flow Key. Each bit
      represents an Information Element in the Data Record with the n-th
      bit representing the n-th Information Element.  A set bit with
      value 1 indicates that the corresponding Information element is a
      Flow Key of the reported Flow.  A value of 0 indicates that this
      is not the case.  If the Data Record contains more than 64
      Information Elements, the corresponding Template SHOULD be
      designed such that all Flow Keys are among the first 64
      Information Elements, because the flowKeyIndicator only contains
      64 bits.  If the Data Record contains less than 64 Information
      Elements, then the bits in the flowKeyIndicator for which no
      corresponding Information Element exists SHOULD have the value 0.
   Abstract Data Type: unsigned64
   Data Type Semantics: flags
   ElementId: 173
   Status: current

5.3.  IP Header Fields

   Information Elements in this section indicate values of IP header
   fields or are derived from IP header field values in combination with
   further information.



















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   +-----+---------------------------+-----+---------------------------+
   |  ID | Name                      |  ID | Name                      |
   +-----+---------------------------+-----+---------------------------+
   |  60 | ipVersion                 | 195 | ipDiffServCodePoint       |
   |   8 | sourceIPv4Address         | 196 | ipPrecedence              |
   |  27 | sourceIPv6Address         |   5 | classOfServiceIPv4        |
   |   9 | sourceIPv4Mask            |  55 | postClassOfServiceIPv4    |
   |  29 | sourceIPv6Mask            | 137 | classOfServiceIPv6        |
   |  44 | sourceIPv4Prefix          | 138 | postClassOfServiceIPv6    |
   | 170 | sourceIPv6Prefix          |  31 | flowLabelIPv6             |
   |  12 | destinationIPv4Address    | 206 | isMulticast               |
   |  28 | destinationIPv6Address    |  54 | identificationIPv4        |
   |  13 | destinationIPv4Mask       |  88 | fragmentOffsetIPv4        |
   |  30 | destinationIPv6Mask       | 197 | fragmentFlagsIPv4         |
   |  45 | destinationIPv4Prefix     | 189 | ipHeaderLength            |
   | 169 | destinationIPv6Prefix     | 213 | headerLengthIPv4          |
   | 192 | ipTimeToLive              | 207 | internetHeaderLengthIPv4  |
   |   4 | protocolIdentifier        | 190 | totalLengthIPv4           |
   | 193 | nextHeaderIPv6            | 191 | payloadLengthIPv6         |
   | 194 | ipClassOfService          | 204 | ipPayloadLength           |
   +-----+---------------------------+-----+---------------------------+

5.3.1.  ipVersion

   Description: The IP version field in the IP packet header.
   Abstract Data Type: octet
   Data Type Semantics: identifier
   ElementId: 60
   Status: current
   Reference:
      See RFC 791 for a definition of the version field in the IPv4
      packet header.  See RFC 2460 for a definition of the version field
      in the IPv6 packet header.  Additional information on defined
      version numbers can be found at
      http://www.iana.org/assignments/version-numbers.

5.3.2.  sourceIPv4Address

   Description:
      The IPv4 source address in the IP packet header.
   Abstract Data Type: ipv4Address
   Data Type Semantics: identifier
   ElementId: 8
   Status: current







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   Reference: See RFC 791 for the definition of the IPv4 source address
      field.

5.3.3.  sourceIPv6Address

   Description:
      The IPv6 source address in the IP packet header.
   Abstract Data Type: ipv6Address
   Data Type Semantics: identifier
   ElementId: 27
   Status: current

5.3.4.  sourceIPv4Mask

   Description:
      The number of contiguous bits that are relevant in the
      sourceIPv4Prefix Information Element.
   Abstract Data Type: octet
   ElementId: 9
   Status: current
   Units: bits
   Range: The valid range is 0-32.

5.3.5.  sourceIPv6Mask

   Description:
      The number of contiguous bits that are relevant in the
      sourceIPv6Prefix Information Element.
   Abstract Data Type: octet
   ElementId: 29
   Status: current
   Units: bits
   Range: The valid range is 0-128.

5.3.6.  sourceIPv4Prefix

   Description:
      IPv4 source address prefix.
   Abstract Data Type: ipv4Address
   ElementId: 44
   Status: current

5.3.7.  sourceIPv6Prefix








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   Description:
      IPv6 source address prefix.
   Abstract Data Type: ipv6Address
   ElementId: 170
   Status: current

5.3.8.  destinationIPv4Address

   Description:
      The IPv4 destination address in the IP packet header.
   Abstract Data Type: ipv4Address
   Data Type Semantics: identifier
   ElementId: 12
   Status: current
   Reference: See RFC 791 for the definition of the IPv4 destination
      address field.

5.3.9.  destinationIPv6Address

   Description:
      The IPv6 destination address in the IP packet header.
   Abstract Data Type: ipv6Address
   Data Type Semantics: identifier
   ElementId: 28
   Status: current

5.3.10.  destinationIPv4Mask

   Description:
      The number of contiguous bits that are relevant in the
      destinationIPv4Prefix Information Element.
   Abstract Data Type: octet
   ElementId: 13
   Status: current
   Units: bits
   Range: The valid range is 0-32.

5.3.11.  destinationIPv6Mask

   Description:
      The number of contiguous bits that are relevant in the
      destinationIPv6Prefix Information Element.
   Abstract Data Type: octet
   ElementId: 30







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   Status: current
   Units: bits
   Range: The valid range is 0-128.

5.3.12.  destinationIPv4Prefix

   Description:
      IPv4 destination address prefix.
   Abstract Data Type: ipv4Address
   ElementId: 45
   Status: current

5.3.13.  destinationIPv6Prefix

   Description:
      IPv6 destination address prefix.
   Abstract Data Type: ipv6Address
   ElementId: 169
   Status: current

5.3.14.  ipTimeToLive

   Description:
      For IPv4, the value of the Information Element matches the value
      of the Time to Live field in the IPv4 packet header.  For IPv6,
      the value of the Information Element matches the value of the Hop
      Limit field in the IPv6 packet header.
   Abstract Data Type: octet
   ElementId: 192
   Status: current
   Units: hops
   Reference: See RFC 791 for the definition of the IPv4 Time to Live
      field.  See RFC 2460 for the definition of the IPv6 Hop Limit
      field.

5.3.15.  protocolIdentifier

   Description:
      The value of the protocol number in the IP packet header.  The
      protocol number identifies the IP packet payload type.  Protocol
      numbers are defined in the IANA Protocol Numbers registry.
      In Internet Protocol version 4 (IPv4) this is carried in the
      "Protocol" field.  In Internet Protocol version 6 (IPv6) this is
      carried in the "Next Header" field in the last extension header of
      the packet.






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   Abstract Data Type: octet
   Data Type Semantics: identifier
   ElementId: 4
   Status: current
   Reference:
      See RFC 791 for the specification of the IPv4 protocol field.  See
      RFC 2460 for the specification of the IPv6 protocol field.  See
      the list of protocol numbers assigned by IANA at
      http://www.iana.org/assignments/protocol-numbers.

5.3.16.  nextHeaderIPv6

   Description:
      The value of the Next Header field of the IPv6 header.  The value
      identifies the type of the following IPv6 extension header or of
      the following IP payload.  Valid values are defined in the IANA
      Protocol Numbers registry.
   Abstract Data Type: octet
   ElementId: 193
   Status: current
   Reference: See RFC 2460 for the definition of the IPv6 Next Header
      field.  See the list of protocol numbers assigned by IANA at
      http://www.iana.org/assignments/protocol-numbers.

5.3.17.  ipClassOfService

   Description:
      For IPv4 packets, this is the value of the TOS field in the IPv4
      packet header.  For IPv6 packets, this is the value of the Traffic
      Class field in the IPv6 packet header.
   Abstract Data Type: octet
   Data Type Semantics: identifier
   ElementId: 194
   Status: current
   Reference: See section 5.3.2 of RFC 1812 and RFC 791 for the
      definition of the IPv4 TOS field.  See RFC 2460 for the definition
      of the IPv6 Traffic Class field.

5.3.18.  ipDiffServCodePoint

   Description:
      The value of a Differentiated Services Code Point (DSCP) encoded
      in the Differentiated Services Field.  The Differentiated Services
      Field spans the most significant 6 bits of the IPv4 TOS field or
      the IPv6 Traffic class field, respectively.






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      This Information Element encodes only the 6 bits of the
      Differentiated Services field.  Therefore its value may range from
      0 to 63.
   Abstract Data Type: octet
   Data Type Semantics: identifier
   ElementId: 195
   Status: current
   Range: The valid range is 0-63.
   Reference: See RFC 3260 for the definition of the Differentiated
      Services Field.  See section 5.3.2 of RFC 1812 and RFC 791 for the
      definition of the IPv4 TOS field.  See RFC 2460 for the definition
      of the IPv6 Traffic Class field.

5.3.19.  ipPrecedence

   Description:
      The value of the IP Precedence.  The IP Precedence value is
      encoded in the first 3 bits of the IPv4 TOS field or the IPv6
      Traffic class field, respectively.
      This Information Element encodes only the 3 bits of the
      Differentiated Services field.  Therefore its value may range from
      0 to 7.
   Abstract Data Type: octet
   Data Type Semantics: identifier
   ElementId: 196
   Status: current
   Range: The valid range is 0-7.
   Reference: See section 5.3.3 of RFC 1812 and RFC 791 for the
      definition of the IP Precedence.  See section 5.3.2 of RFC 1812
      and RFC 791 for the definition of the IPv4 TOS field.  See RFC
      2460 for the definition of the IPv6 Traffic Class field.

5.3.20.  classOfServiceIPv4

   Description:
      The value of the TOS field in the IPv4 packet header.
   Abstract Data Type: octet
   Data Type Semantics: identifier
   ElementId: 5
   Status: current
   Reference: See RFC 791 for the definition of the IPv4 TOS field.

5.3.21.  postClassOfServiceIPv4








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   Description:
      The definition of this Information Element is identical to the
      definition of Information Element 'classOfServiceIPv4', except
      that it reports a potentially modified value caused by a middlebox
      function after the packet passed the observation point.
   Abstract Data Type: octet
   Data Type Semantics: identifier
   ElementId: 55
   Status: current
   Reference: See RFC 791 for the definition of the IPv4 TOS field.  See
      RFC 3234 for the definition of middleboxes.

5.3.22.  classOfServiceIPv6

   Description:
      The value of the Traffic Class field in the IPv6 packet header.
   Abstract Data Type: octet
   Data Type Semantics: identifier
   ElementId: 137
   Status: current
   Reference: See RFC 2460 for the definition of the IPv6 Traffic Class
      field.

5.3.23.  postClassOfServiceIPv6

   Description:
      The definition of this Information Element is identical to the
      definition of Information Element 'classOfServiceIPv6', except
      that it reports a potentially modified value caused by a middlebox
      function after the packet passed the observation point.
   Abstract Data Type: octet
   Data Type Semantics: identifier
   ElementId: 138
   Status: current
   Reference: See RFC 2460 for the definition of the IPv6 traffic class
      field.

5.3.24.  flowLabelIPv6

   Description:
      The value of the IPv6 Flow Label field in the IP packet header.
   Abstract Data Type: unsigned32
   Data Type Semantics: identifier
   ElementId: 31







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   Status: current
   Reference: See RFC 2460 for a definition of the flow label field in
      the IPv6 packet header.

5.3.25.  isMulticast

   Description:
      If the IP destination address is a reserved multicast address then
      the value of this Information Element is not equal to zero.
      Otherwise, the value of all bits of the octet is zero.
      The first bit of this octet is set to 1 if the Version field of
      the IP header has the value 4 and if the Destination Address field
      contains a reserved multicast address in the range from 224.0.0.0
      to 239.255.255.255.  Otherwise, this bit is set to 0.
      The second and third bit of this octet are reserved for future
      use.
      The remaining bits of the octet are only set to values other than
      zero if th IP Destination Address is a reserved IPv6 multicast
      address.  Then the fourth bit of the octet is set to the value of
      the T flag in the IPv6 multicast address and the remaining four
      bits are set to the value of the scope field in the IPv6 multicast
      address.

             0      1      2      3      4      5      6      7
          +------+------+------+------+------+------+------+------+
          | MCv4 | RES. | RES. |  T   |   IPv6 multicast scope    |
          +------+------+------+------+------+------+------+------+

          Bit 0:    set to 1 if IPv4 multicast
          Bit 1-2:  reserved for future use
          Bit 4:    set to value of T-flag, if IPv6 multicast
          Bit 4-7:  set to value of multicast scope if IPv6 multicast

   Abstract Data Type: octet
   Data Type Semantics: flags
   ElementId: 206
   Status: current
   Reference: See RFC 1112 for the specification of reserved IPv4
      multicast addresses.  See RFC 3513 for the specification of
      reserved IPv6 multicast addresses and the definition of the T-flag
      and the IPv6 multicast scope.

5.3.26.  identificationIPv4








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   Description:
      The value of the IPv4 packet identification field in the IP packet
      header.
   Abstract Data Type: unsigned16
   Data Type Semantics: identifier
   ElementId: 54
   Status: current
   Reference: See RFC 791 for the definition of the IPv4 identification
      field.

5.3.27.  fragmentOffsetIPv4

   Description:
      The value of the IPv4 fragment offset field in the IP packet
      header.
   Abstract Data Type: unsigned16
   Data Type Semantics: identifier
   ElementId: 88
   Status: current
   Reference:
      See RFC 791 for the specification of the IPv4 fragment offset.

5.3.28.  fragmentFlagsIPv4

   Description:
      The value of the fragmentation bits in the IPv4 packet header.

         Bit 0:    reserved, must be zero.
         Bit 1:    (DF) 0 = May Fragment,  1 = Don't Fragment.
         Bit 2:    (MF) 0 = Last Fragment, 1 = More Fragments.
         Bits 3-7: (DC) Don't Care, value is irrelevant.

             0   1   2   3   4   5   6   7
           +---+---+---+---+---+---+---+---+
           |   | D | M | D | D | D | D | D |
           | 0 | F | F | C | C | C | C | C |
           +---+---+---+---+---+---+---+---+

   Abstract Data Type: octet
   Data Type Semantics: flags
   ElementId: 197
   Status: current
   Reference:
      See RFC 791 for the specification of the IPv4 fragment flags.

5.3.29.  ipHeaderLength





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   Description:
      The length of the IP header.  For IPv6, the value of this
      Information Element is 40.
   Abstract Data Type: octet
   ElementId: 189
   Status: current
   Units: octets
   Reference:
      See RFC 791 for the specification of the IPv4 header.  See RFC
      2460 for the specification of the IPv6 header.

5.3.30.  headerLengthIPv4

   Description:
      The length of the IPv4 header.
   Abstract Data Type: octet
   ElementId: 213
   Status: current
   Units: octets
   Reference:
      See RFC 791 for the specification of the IPv4 header.

5.3.31.  internetHeaderLengthIPv4

   Description:
      The value of the Internet Header Length (IHL) field in the IPv4
      header.  It specifies the length of the header in units of 4
      octets.
   Abstract Data Type: octet
   ElementId: 207
   Status: current
   Units: 4 octets
   Reference:
      See RFC 791 for the specification of the IPv4 header.

5.3.32.  totalLengthIPv4

   Description:
      The total length of the IPv4 packet.
   Abstract Data Type: unsigned16
   ElementId: 190
   Status: current
   Units: octets
   Reference:







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      See RFC 791 for the specification of the IPv4 total length.

5.3.33.  payloadLengthIPv6

   Description:
      The length of the IPv6 payload, i.e., the rest of the packet
      following the IPv6 header, in octets.  Note that any extension
      headers present are considered part of the payload, i.e., included
      in the length count.
      This Information Element reports the value of the Payload Length
      field in the IPv6 header except in the case that the value of this
      field is zero and that there is a valid jumbo payload option.
      Then the value of the Jumbo Payload Length field in the jumbo
      payload option is reported.
   Abstract Data Type: unsigned32
   ElementId: 191
   Status: current
   Reference:
      See RFC 2460 for the specification of the IPv6 payload length.
      See RFC 2675 for the specification of the IPv6 jumbo payload
      length.

5.3.34.  ipPayloadLength

   Description:
      The effective length of the IP payload.
      For IPv4 packets the value of this Information Element is the
      difference between the total length of the IPv4 packet (as
      reported by Information Element totalLengthIPv4) and the length of
      the IPv4 header (as reported by Information Element
      headerLengthIPv4).
      For IPv6, the value of the Payload Length field in the IPv6 header
      is reported except in the case that the value of this field is
      zero and that there is a valid jumbo payload option.  In this case
      the value of the Jumbo Payload Length field in the jumbo payload
      option is reported.
   Abstract Data Type: unsigned64
   ElementId: 204
   Status: current
   Reference:
      See RFC 791 for the specification of IPv4 packets.  See RFC 2460
      for the specification of the IPv6 payload length.  See RFC 2675
      for the specification of the IPv6 jumbo payload length.

5.4.  Transport Header Fields

   The set of Information Elements related to transport header fields
   and length includes the Information Elements listed in the table



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   below.

   +-----+---------------------------+-----+---------------------------+
   |  ID | Name                      |  ID | Name                      |
   +-----+---------------------------+-----+---------------------------+
   |   7 | sourceTransportPort       | 187 | tcpUrgentPointer          |
   |  11 | destinationTransportPort  | 188 | tcpHeaderLength           |
   | 180 | udpSourcePort             |  32 | icmpTypeCodeIPv4          |
   | 181 | udpDestinationPort        | 176 | icmpTypeIPv4              |
   | 205 | udpMessageLength          | 177 | icmpCodeIPv4              |
   | 182 | tcpSourcePort             | 139 | icmpTypeCodeIPv6          |
   | 183 | tcpDestinationPort        | 178 | icmpTypeIPv6              |
   | 184 | tcpSequenceNumber         | 179 | icmpCodeIPv6              |
   | 185 | tcpAcknowledgementNumber  |  33 | igmpType                  |
   | 186 | tcpWindowSize             |     |                           |
   +-----+---------------------------+-----+---------------------------+

5.4.1.  sourceTransportPort

   Description:
      The source port identifier in the transport header.  For the
      transport protocols UDP, TCP and SCTP this is the source port
      number given in the respective header.  This field MAY also be
      used for future transport protocols that have 16 bit source port
      identifiers.
   Abstract Data Type: unsigned16
   Data Type Semantics: identifier
   ElementId: 7
   Status: current
   Reference:
      See RFC 768 for the definition of the UDP source port field.  See
      RFC 793 for the definition of the TCP source port field.  See RFC
      2960 for the definition of SCTP.
      Additional information on defined UDP and TCP port numbers can be
      found at http://www.iana.org/assignments/port-numbers.

5.4.2.  destinationTransportPort

   Description:
      The destination port identifier in the transport header.  For the
      transport protocols UDP, TCP and SCTP this is the destination port
      number given in the respective header.  This field MAY also be
      used for future transport protocols that have 16 bit destination
      port identifiers.







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   Abstract Data Type: unsigned16
   Data Type Semantics: identifier
   ElementId: 11
   Status: current
   Reference:
      See RFC 768 for the definition of the UDP source port field.  See
      RFC 793 for the definition of the TCP source port field.  See RFC
      2960 for the definition of SCTP.
      Additional information on defined UDP and TCP port numbers can be
      found at http://www.iana.org/assignments/port-numbers.

5.4.3.  udpSourcePort

   Description: The source port identifier in the UDP header.
   Abstract Data Type: unsigned16
   Data Type Semantics: identifier
   ElementId: 180
   Status: current
   Reference: See RFC 768 for the definition of the UDP source port
      field.  Additional information on defined UDP port numbers can be
      found at http://www.iana.org/assignments/port-numbers.

5.4.4.  udpDestinationPort

   Description: The destination port identifier in the UDP header.
   Abstract Data Type: unsigned16
   Data Type Semantics: identifier
   ElementId: 181
   Status: current
   Reference: See RFC 768 for the definition of the UDP source port
      field.  Additional information on defined UDP port numbers can be
      found at http://www.iana.org/assignments/port-numbers.

5.4.5.  udpMessageLength

   Description: The value of the Length field in the UDP header.
   Abstract Data Type: unsigned16
   ElementId: 205
   Status: current
   Units: octets
   Reference: See RFC 768 for the specification of the UDP header.

5.4.6.  tcpSourcePort








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   Description: The source port identifier in the TCP header.
   Abstract Data Type: unsigned16
   Data Type Semantics: identifier
   ElementId: 182
   Status: current
   Reference: See RFC 793 for the definition of the TCP source port
      field.  Additional information on defined TCP port numbers can be
      found at http://www.iana.org/assignments/port-numbers.

5.4.7.  tcpDestinationPort

   Description: The destination port identifier in the TCP header.
   Abstract Data Type: unsigned16
   Data Type Semantics: identifier
   ElementId: 183
   Status: current
   Reference: See RFC 793 for the definition of the TCP source port
      field.  Additional information on defined TCP port numbers can be
      found at http://www.iana.org/assignments/port-numbers.

5.4.8.  tcpSequenceNumber

   Description: The sequence number in the TCP header.
   Abstract Data Type: unsigned32
   ElementId: 184
   Status: current
   Reference: See RFC 793 for the definition of the TCP sequence number.

5.4.9.  tcpAcknowledgementNumber

   Description: The acknowledgement number in the TCP header.
   Abstract Data Type: unsigned32
   ElementId: 185
   Status: current
   Reference: See RFC 793 for the definition of the TCP acknowledgement
      number.

5.4.10.  tcpWindowSize

   Description: The window field in the TCP header.
   Abstract Data Type: unsigned16
   ElementId: 186
   Status: current
   Reference: See RFC 793 for the definition of the TCP window field.

5.4.11.  tcpUrgentPointer





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   Description: The urgent pointer in the TCP header.
   Abstract Data Type: unsigned16
   ElementId: 187
   Status: current
   Reference: See RFC 793 for the definition of the TCP urgent pointer.

5.4.12.  tcpHeaderLength

   Description: The length of the TCP header.
   Abstract Data Type: unsigned16
   ElementId: 188
   Status: current
   Units: octets
   Reference: See RFC 793 for the definition of the TCP header.

5.4.13.  icmpTypeCodeIPv4

   Description:
      Type and Code of the IPv4 ICMP message.  The combination of both
      values is reported as (ICMP type * 256) + ICMP code.
   Abstract Data Type: unsigned16
   Data Type Semantics: identifier
   ElementId: 32
   Status: current
   Reference: See RFC 792 for a definition of the IPv4 ICMP type and
      code fields.

5.4.14.  icmpTypeIPv4

   Description:
      Type of the IPv4 ICMP message.
   Abstract Data Type: octet
   Data Type Semantics: identifier
   ElementId: 176
   Status: current
   Reference: See RFC 792 for a definition of the IPv4 ICMP type field.

5.4.15.  icmpCodeIPv4

   Description:
      Code of the IPv4 ICMP message.
   Abstract Data Type: octet
   Data Type Semantics: identifier
   ElementId: 177







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   Status: current
   Reference: See RFC 792 for a definition of the IPv4 ICMP code field.

5.4.16.  icmpTypeCodeIPv6

   Description:
      Type and Code of the IPv6 ICMP message.  The combination of both
      values is reported as (ICMP type * 256) + ICMP code.
   Abstract Data Type: unsigned16
   Data Type Semantics: identifier
   ElementId: 139
   Status: current
   Reference: See RFC 2463 for a definition of the IPv6 ICMP type and
      code fields.

5.4.17.  icmpTypeIPv6

   Description:
      Type of the IPv6 ICMP message.
   Abstract Data Type: octet
   Data Type Semantics: identifier
   ElementId: 178
   Status: current
   Reference: See RFC 2463 for a definition of the IPv6 ICMP type field.

5.4.18.  icmpCodeIPv6

   Description:
      Code of the IPv6 ICMP message.
   Abstract Data Type: octet
   Data Type Semantics: identifier
   ElementId: 179
   Status: current
   Reference: See RFC 2463 for a definition of the IPv6 ICMP code field.

5.4.19.  igmpType

   Description: The type field of the IGMP message.
   Abstract Data Type: octet
   Data Type Semantics: identifier
   ElementId: 33
   Status: current
   Reference: See RFC 2236 for a definition of the IGMP type field.

5.5.  Sub-IP Header Fields

   The set of Information Elements related to Sub-IP header fields
   includes the Information Elements listed in the table below.



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   +-----+---------------------------+-----+---------------------------+
   |  ID | Name                      |  ID | Name                      |
   +-----+---------------------------+-----+---------------------------+
   |  56 | sourceMacAddress          | 214 | mplsPayloadLength         |
   |  81 | postSourceMacAddress      |  70 | mplsTopLabelStackEntry    |
   |  58 | vlanId                    |  71 | mplsLabelStackEntry2      |
   |  59 | postVlanId                |  72 | mplsLabelStackEntry3      |
   |  80 | destinationMacAddress     |  73 | mplsLabelStackEntry4      |
   |  57 | postDestinationMacAddr    |  74 | mplsLabelStackEntry5      |
   | 146 | wlanChannelId             |  75 | mplsLabelStackEntry6      |
   | 147 | wlanSsid                  |  76 | mplsLabelStackEntry7      |
   | 200 | mplsTopLabelTtl           |  77 | mplsLabelStackEntry8      |
   | 203 | mplsTopLabelExp           |  78 | mplsLabelStackEntry9      |
   | 202 | mplsLabelStackDepth       |  79 | mplsLabelStackEntry10     |
   | 201 | mplsLabelStackLength      |     |                           |
   +-----+---------------------------+-----+---------------------------+

5.5.1.  sourceMacAddress

   Description:
      The IEEE 802 source MAC address field.
   Abstract Data Type: macAddress
   Data Type Semantics: identifier
   ElementId: 56
   Status: current
   Reference: See IEEE.802-3.2002.

5.5.2.  postSourceMacAddress

   Description:
      The definition of this Information Element is identical to the
      definition of Information Element 'sourceMacAddress', except that
      it reports a potentially modified value caused by a middlebox
      function after the packet passed the observation point.
   Abstract Data Type: macAddress
   Data Type Semantics: identifier
   ElementId: 81
   Status: current
   Reference: See IEEE.802-3.2002.

5.5.3.  vlanId

   Description:
      The IEEE 802.1Q VLAN identifier (VID) extracted from the Tag
      Control Information field that was attached to the IP packet.






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   Abstract Data Type: unsigned16
   Data Type Semantics: identifier
   ElementId: 58
   Status: current
   Reference: See IEEE.802-1Q.2003.

5.5.4.  postVlanId

   Description:
      The definition of this Information Element is identical to the
      definition of Information Element 'vlanId', except that it reports
      a potentially modified value caused by a middlebox function after
      the packet passed the observation point.
   Abstract Data Type: unsigned16
   Data Type Semantics: identifier
   ElementId: 59
   Status: current
   Reference: See IEEE.802-1Q.2003.

5.5.5.  destinationMacAddress

   Description:
      The IEEE 802 destination MAC address field.
   Abstract Data Type: macAddress
   Data Type Semantics: identifier
   ElementId: 80
   Status: current
   Reference: See IEEE.802-3.2002.

5.5.6.  postDestinationMacAddr

   Description:
      The definition of this Information Element is identical to the
      definition of Information Element 'destinationMacAddress', except
      that it reports a potentially modified value caused by a middlebox
      function after the packet passed the observation point.
   Abstract Data Type: macAddress
   Data Type Semantics: identifier
   ElementId: 57
   Status: current
   Reference: See IEEE.802-3.2002.

5.5.7.  wlanChannelId








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   Description:
      The identifier of the 802.11 (Wi-Fi) channel used.
   Abstract Data Type: octet
   Data Type Semantics: identifier
   ElementId: 146
   Status: current
   Reference: See IEEE.802-11.1999.

5.5.8.  wlanSsid

   Description:
      The Service Set IDentifier (SSID) identifying an 802.11 (Wi-Fi)
      network used.  According to IEEE.802-11.1999 the SSID is encoded
      into a string of up to 32 characters.
   Abstract Data Type: string
   ElementId: 147
   Status: current
   Reference: See IEEE.802-11.1999.

5.5.9.  mplsTopLabelTtl

   Description: The TTL field from the top MPLS label stack entry, i.e.
      the last label that was pushed.
   Abstract Data Type: unsigned32
   ElementId: 200
   Status: current
   Reference: See RFC 3032 for the specification of the TTL field.

5.5.10.  mplsTopLabelExp

   Description:
      The Exp field from the top MPLS label stack entry, i.e. the last
      label that was pushed.

         Bit 0-4:  Don't Care, value is irrelevant.
         Bit 5-7:  MPLS Exp field

             0   1   2   3   4   5   6   7
           +---+---+---+---+---+---+---+---+
           |     don't care    |    Exp    |
           +---+---+---+---+---+---+---+---+

   Abstract Data Type: octet
   Data Type Semantics: flags







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   ElementId: 203
   Status: current
   Reference: See RFC 3032 for the specification of the Exp field.  See
      RFC 3270 for usage of the Exp field.

5.5.11.  mplsLabelStackDepth

   Description: The number of labels in the MPLS label stack.
   Abstract Data Type: unsigned32
   ElementId: 202
   Status: current
   Units: label stack entries
   Reference: See RFC 3032 for the specification of the MPLS label
      stack.

5.5.12.  mplsLabelStackLength

   Description: The length of the MPLS label stack in units of octets.
   Abstract Data Type: unsigned32
   ElementId: 201
   Status: current
   Units: octets
   Reference: See RFC 3032 for the specification of the MPLS label
      stack.

5.5.13.  mplsPayloadLength

   Description: The size of the MPLS packet without the label stack.
   Abstract Data Type: unsigned32
   ElementId: 214
   Status: current
   Units: octets
   Reference: See RFC 3031 for the specification of MPLS packets.  See
      RFC 3032 for the specification of the MPLS label stack.

5.5.14.  mplsTopLabelStackEntry

   Description:
      The label, exp and s fields from the top MPLS label stack entry,
      i.e. the last label that was pushed.











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       0                   1                   2
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                Label                  | Exp |S|
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      Label:  Label Value, 20 bits
      Exp:    Experimental Use, 3 bits
      S:      Bottom of Stack, 1 bit

   Abstract Data Type: unsigned32
   Data Type Semantics: identifier
   ElementId: 70
   Status: current
   Reference: See RFC 3032.

5.5.15.  mplsLabelStackEntry2

   Description:
      The label, exp, and s fields from the label stack entry that was
      pushed immediately before the label stack entry that would be
      reported by mplsTopLabelStackEntry.  See the definition of
      mplsTopLabelStackEntry for further details.
   Abstract Data Type: unsigned32
   Data Type Semantics: identifier
   ElementId: 71
   Status: current
   Reference: See RFC 3032.

5.5.16.  mplsLabelStackEntry3

   Description:
      The label, exp, and s fields from the label stack entry that was
      pushed immediately before the label stack entry that would be
      reported by mplsLabelStackEntry2.  See the definition of
      mplsTopLabelStackEntry for further details.
   Abstract Data Type: unsigned32
   Data Type Semantics: identifier
   ElementId: 72
   Status: current
   Reference: See RFC 3032.

5.5.17.  mplsLabelStackEntry4








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   Description:
      The label, exp, and s fields from the label stack entry that was
      pushed immediately before the label stack entry that would be
      reported by mplsLabelStackEntry3.  See the definition of
      mplsTopLabelStackEntry for further details.
   Abstract Data Type: unsigned32
   Data Type Semantics: identifier
   ElementId: 73
   Status: current
   Reference: See RFC 3032.

5.5.18.  mplsLabelStackEntry5

   Description:
      The label, exp, and s fields from the label stack entry that was
      pushed immediately before the label stack entry that would be
      reported by mplsLabelStackEntry4.  See the definition of
      mplsTopLabelStackEntry for further details.
   Abstract Data Type: unsigned32
   Data Type Semantics: identifier
   ElementId: 74
   Status: current
   Reference: See RFC 3032.

5.5.19.  mplsLabelStackEntry6

   Description:
      The label, exp, and s fields from the label stack entry that was
      pushed immediately before the label stack entry that would be
      reported by mplsLabelStackEntry5.  See the definition of
      mplsTopLabelStackEntry for further details.
   Abstract Data Type: unsigned32
   Data Type Semantics: identifier
   ElementId: 75
   Status: current
   Reference: See RFC 3032.

5.5.20.  mplsLabelStackEntry7

   Description:
      The label, exp, and s fields from the label stack entry that was
      pushed immediately before the label stack entry that would be
      reported by mplsLabelStackEntry6.  See the definition of
      mplsTopLabelStackEntry for further details.







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   Abstract Data Type: unsigned32
   Data Type Semantics: identifier
   ElementId: 76
   Status: current
   Reference: See RFC 3032.

5.5.21.  mplsLabelStackEntry8

   Description:
      The label, exp, and s fields from the label stack entry that was
      pushed immediately before the label stack entry that would be
      reported by mplsLabelStackEntry7.  See the definition of
      mplsTopLabelStackEntry for further details.
   Abstract Data Type: unsigned32
   Data Type Semantics: identifier
   ElementId: 77
   Status: current
   Reference: See RFC 3032.

5.5.22.  mplsLabelStackEntry9

   Description:
      The label, exp, and s fields from the label stack entry that was
      pushed immediately before the label stack entry that would be
      reported by mplsLabelStackEntry8.  See the definition of
      mplsTopLabelStackEntry for further details.
   Abstract Data Type: unsigned32
   Data Type Semantics: identifier
   ElementId: 78
   Status: current
   Reference: See RFC 3032.

5.5.23.  mplsLabelStackEntry10

   Description:
      The label, exp, and s fields from the label stack entry that was
      pushed immediately before the label stack entry that would be
      reported by mplsLabelStackEntry9.  See the definition of
      mplsTopLabelStackEntry for further details.
   Abstract Data Type: unsigned32
   Data Type Semantics: identifier
   ElementId: 79
   Status: current
   Reference: See RFC 3032.

5.6.  Derived Packet Properties

   The set of Information Elements derived from values of header fields



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   and further information includes the Information Elements listed in
   the table below.

   +-----+---------------------------+-----+---------------------------+
   |  ID | Name                      |  ID | Name                      |
   +-----+---------------------------+-----+---------------------------+
   |  15 | ipNextHopIPv4Address      |  18 | bgpNextHopIPv4Address     |
   |  62 | ipNextHopIPv6Address      |  63 | bgpNextHopIPv6Address     |
   |  16 | bgpSourceAsNumber         |  46 | mplsTopLabelType          |
   |  17 | bgpDestinationAsNumber    |  47 | mplsTopLabelIPv4Address   |
   | 128 | bgpNextAdjacentAsNumber   | 140 | mplsTopLabelIPv6Address   |
   | 129 | bgpPrevAdjacentAsNumber   |     |                           |
   +-----+---------------------------+-----+---------------------------+

5.6.1.  ipNextHopIPv4Address

   Description:
      The IPv4 address of the next IPv4 hop.
   Abstract Data Type: ipv4Address
   Data Type Semantics: identifier
   ElementId: 15
   Status: current

5.6.2.  ipNextHopIPv6Address

   Description:
      The IPv6 address of the next IPv6 hop.
   Abstract Data Type: ipv6Address
   Data Type Semantics: identifier
   ElementId: 62
   Status: current

5.6.3.  bgpSourceAsNumber

   Description:
      The autonomous system (AS) number of the source IP address.  If AS
      path information for this Flow is only available as unordered AS
      set (and not as ordered AS sequence), then the value of this
      Information Element is 0.
   Abstract Data Type: unsigned16
   Data Type Semantics: identifier
   ElementId: 16
   Status: current
   Reference: See RFC 1771 for a description of BGP-4 and see RFC 1930
      for a definition of the AS number.






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5.6.4.  bgpDestinationAsNumber

   Description:
      The autonomous system (AS) number of the destination IP address.
      If AS path information for this Flow is only available as
      unordered AS set (and not as ordered AS sequence), then the value
      of this Information Element is 0.
   Abstract Data Type: unsigned16
   Data Type Semantics: identifier
   ElementId: 17
   Status: current
   Reference: See RFC 1771 for a description of BGP-4 and see RFC 1930
      for a definition of the AS number.

5.6.5.  bgpNextAdjacentAsNumber

   Description:
      The autonomous system (AS) number of the first AS in the AS path
      to the destination IP address.  The path is deduced by looking up
      the destination IP address of the Flow in the BGP routing
      information base.  If AS path information for this Flow is only
      available as unordered AS set (and not as ordered AS sequence),
      then the value of this Information Element is 0.
   Abstract Data Type: unsigned16
   Data Type Semantics: identifier
   ElementId: 128
   Status: current
   Reference: See RFC 1771 for a description of BGP-4 and see RFC 1930
      for a definition of the AS number.

5.6.6.  bgpPrevAdjacentAsNumber

   Description:
      The autonomous system (AS) number of the last AS in the AS path
      from the source IP address.  The path is deduced by looking up the
      source IP address of the Flow in the BGP routing information base.
      If AS path information for this Flow is only available as
      unordered AS set (and not as ordered AS sequence), then the value
      of this Information Element is 0.  In case of BGP asymmetry, the
      bgpPrevAdjacentAsNumber might not be able to report the correct
      value.
   Abstract Data Type: unsigned16
   Data Type Semantics: identifier
   ElementId: 129







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   Status: current
   Reference: See RFC 1771 for a description of BGP-4 and see RFC 1930
      for a definition of the AS number.

5.6.7.  bgpNextHopIPv4Address

   Description:
      The IPv4 address of the next (adjacent) BGP hop.
   Abstract Data Type: ipv4Address
   Data Type Semantics: identifier
   ElementId: 18
   Status: current
   Reference: See RFC 1771 for a description of BGP-4 and

5.6.8.  bgpNextHopIPv6Address

   Description:
      The IPv6 address of the next (adjacent) BGP hop.
   Abstract Data Type: ipv6Address
   Data Type Semantics: identifier
   ElementId: 63
   Status: current
   Reference: See RFC 1771 for a description of BGP-4.

5.6.9.  mplsTopLabelType

   Description:
      This field identifies the control protocol that allocated the top
      of stack label.  Defined values for this field include:

        - 0x01 TE-MIDPT: Any TE tunnel mid-point or tail label
        - 0x02 Pseudowire: Any PWE3 or Cisco AToM based label
        - 0x03 VPN: Any label associated with VPN
        - 0x04 BGP: Any label associated with BGP or BGP routing
        - 0x05 LDP: Any label associated with dynamically assigned
                    labels using LDP

   Abstract Data Type: octet
   Data Type Semantics: identifier
   ElementId: 46
   Status: current
   Reference: See RFC 3031 for the MPLS label structure.  See RFC 2547
      for the association of MPLS labels with VPNs.  See RFC 1771 for
      BGP and BGP routing.  See RFC 3036 for LDP. and IP addresses.

5.6.10.  mplsTopLabelIPv4Address





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   Description:
      The IPv4 address of the system that the MPLS top label will cause
      this Flow to be forwarded to.
   Abstract Data Type: ipv4Address
   Data Type Semantics: identifier
   ElementId: 47
   Status: current
   Reference: See RFC 3031 for the association between MPLS labels and
      IP addresses.

5.6.11.  mplsTopLabelIPv6Address

   Description:
      The IPv6 address of the system that the MPLS top label will cause
      this Flow to be forwarded to.
   Abstract Data Type: ipv6Address
   Data Type Semantics: identifier
   ElementId: 140
   Status: current
   Reference: See RFC 3031 for the association between MPLS labels and
      IP addresses.

5.7.  Min/Max Flow Properties

   Information Elements in this section are results of minimum or
   maximum operations over all packets of a Flow.

   +-----+---------------------------+-----+---------------------------+
   |  ID | Name                      |  ID | Name                      |
   +-----+---------------------------+-----+---------------------------+
   |  25 | minimumPacketLength       | 208 | ipv4Options               |
   |  26 | maximumPacketLength       |  64 | ipv6ExtensionHeaders      |
   |  52 | minimumTtl                |   6 | tcpControlBits            |
   |  53 | maximumTtl                | 209 | tcpOptions                |
   +-----+---------------------------+-----+---------------------------+

5.7.1.  minimumPacketLength

   Description:
      Length of the smallest packet observed for this Flow.
   Abstract Data Type: unsigned16
   ElementId: 25
   Status: current
   Units: octets

5.7.2.  maximumPacketLength





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   Description:
      Length of the largest packet observed for this Flow.
   Abstract Data Type: unsigned16
   ElementId: 26
   Status: current
   Units: octets

5.7.3.  minimumTtl

   Description:
      Minimum TTL value observed for any packet in this Flow.
   Abstract Data Type: octet
   ElementId: 52
   Status: current

5.7.4.  maximumTtl

   Description:
      Maximum TTL value observed for any packet in this Flow.
   Abstract Data Type: octet
   ElementId: 53
   Status: current

5.7.5.  ipv4Options

   Description:
      IPv4 options in packets of this Flow.  The information is encoded
      in a set of bit fields.  For each valid IPv4 option type there is
      a bit in this set.  The bit is set to 1 if any observed packet of
      this Flow contains the corresponding IPv4 option type.  Otherwise,
      if no observed packet of this Flow contained the respective IPv4
      option type, the value of the corresponding bit is 0.
      The list of valid IPv4 options is maintained by IANA.  Note that
      for identifying an option not just the 5-bit Option Number, but
      all 8 bits of the Option Type need to match one of the IPv4
      options specified at
      http://www.iana.org/assignments/ip-parameters.
      Options are mapped to bits according to their option numbers.
      Option number X is mapped to bit X. The mapping is illustrated by
      the figure below.

           0      1      2      3      4      5      6      7
       +------+------+------+------+------+------+------+------+
       | EOOL | NOP  | SEC  | LSR  |  TS  |E-SEC |CIPSO |  RR  | ...
       +------+------+------+------+------+------+------+------+

           8      9     10     11     12     13     14     15
       +------+------+------+------+------+------+------+------+



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   ... | SID  | SSR  | ZSU  | MTUP | MTUR | FINN | VISA |ENCODE| ...
       +------+------+------+------+------+------+------+------+

          16     17     18     19     20     21     22     23
       +------+------+------+------+------+------+------+------+
   ... |IMITD | EIP  |  TR  |ADDEXT|RTRALT| SDB  |NSAPA | DPS  | ...
       +------+------+------+------+------+------+------+------+

          24     25     26     27     28     29     30     31
       +------+------+------+------+------+------+------+------+
   ... | UMP  |             to be assigned by IANA             |
       +------+------+------+------+------+------+------+------+


           Type   Option
       Bit Value  Name    Reference
       ---+-----+-------+------------------------------------
        0     0   EOOL    End of Options List, RFC 791
        1     1   NOP     No Operation, RFC 791
        2   130   SEC     Security, RFC 1108
        3   131   LSR     Loose Source Route, RFC 791
        4    68   TS      Time Stamp, RFC 791
        5   133   E-SEC   Extended Security, RFC 1108
        6   134   CIPSO   Commercial Security
        7     7   RR      Record Route, RFC 791
        8   136   SID     Stream ID, RFC 791
        9   137   SSR     Strict Source Route, RFC 791
       10    10   ZSU     Experimental Measurement
       11    11   MTUP    (obsoleted) MTU Probe, RFC 1191
       12    12   MTUR    (obsoleted) MTU Reply, RFC 1191
       13   205   FINN    Experimental Flow Control
       14   142   VISA    Experimental Access Control
       15    15   ENDOCE
       16   144   IMITD   IMI Traffic Descriptor
       17   145   EIP     Extended Internet Protocol, RFC 1385
       18    82   TR      Traceroute, RFC 3193
       19   147   ADDEXT  Address Extension
       20   148   RTRALT  Router Alert, RFC 2113
       21   149   SDB     Selective Directed Broadcast
       22   150   NSAPA   NSAP Address
       23   151   DPS     Dynamic Packet State
       24   152   UMP     Upstream Multicast Pkt.
       ...  ...   ...     Further options numbers
                          may be assigned by IANA







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   Abstract Data Type: unsigned32
   Data Type Semantics: flags
   ElementId: 208
   Status: current
   Reference: See RFC 791 for the definition of IPv4 options.  See the
      list of IPv4 option numbers assigned by IANA at
      http://www.iana.org/assignments/ip-parameters.

5.7.6.  ipv6ExtensionHeaders

   Description:
      IPv6 extension headers observed in packets of this Flow.  The
      information is encoded in a set of bit fields.  For each IPv6
      option header there is a bit in this set.  The bit is set to 1 if
      any observed packet of this Flow contains the corresponding IPv6
      extension header.  Otherwise, if no observed packet of this Flow
      contained the respective IPv6 extension header, the value of the
      corresponding bit is 0.

































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              0     1     2     3     4     5     6     7
          +-----+-----+-----+-----+-----+-----+-----+-----+
          | Res | FRA1| ROU | FRA0| UNK | Res | HOP | DST |  ...
          +-----+-----+-----+-----+-----+-----+-----+-----+

              8     9    10    11    12    13    14    15
          +-----+-----+-----+-----+-----+-----+-----+-----+
      ... | PAY | AUT | ENC |         Reserved            | ...
          +-----+-----+-----+-----+-----+-----+-----+-----+

             16    17    18    19    20    21    22    23
          +-----+-----+-----+-----+-----+-----+-----+-----+
      ... |                  Reserved                     | ...
          +-----+-----+-----+-----+-----+-----+-----+-----+

             24    25    26    27    28    29    30    31
          +-----+-----+-----+-----+-----+-----+-----+-----+
      ... |                  Reserved                     |
          +-----+-----+-----+-----+-----+-----+-----+-----+

        Bit    IPv6 Option   Description

       0, Res               Reserved
       1, FRA1     44       Fragmentation header - not first fragment
       2, ROU      43       Routing header
       3, FRA0     44       Fragment header - first fragment
       4, UNK               Unknown Layer 4 header
                            (compressed, encrypted, not supported)
       5, Res               Reserved
       6, HOP       0       Hop-by-hop option header
       7, DST      60       Destination option header
       8, PAY     108       Payload compression header
       9, AUT      51       Authentication Header
      10, ENC      50       Encrypted security payload
      11 to 31              Reserved

   Abstract Data Type: unsigned32
   Data Type Semantics: flags
   ElementId: 64
   Status: current
   Reference: See RFC 2460 for the general definition of IPv6 extensions
      headers and for the specification of the hop-by-hop options
      header, the routing header, the fragment header, and the
      destination options header.  See RFC 2402 for the specification of
      the authentication header.  See RFC 2406 for the specification of
      the encapsulating security payload.





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5.7.7.  tcpControlBits

   Description:
      TCP control bits observed for packets of this Flow.  The
      information is encoded in a set of bit fields.  For each TCP
      control bit there is a bit in this set.  A bit is set to 1 if any
      observed packet of this Flow has the corresponding TCP control bit
      set to 1.  A value of 0 for a bit indicates that the corresponding
      bit was not set in any of the observed packets of this Flow.

          0     1     2     3     4     5     6     7
      +-----+-----+-----+-----+-----+-----+-----+-----+
      |  Reserved | URG | ACK | PSH | RST | SYN | FIN |
      +-----+-----+-----+-----+-----+-----+-----+-----+

      Reserved:  Reserved for future use by TCP.  Must be zero.
           URG:  Urgent Pointer field significant
           ACK:  Acknowledgment field significant
           PSH:  Push Function
           RST:  Reset the connection
           SYN:  Synchronize sequence numbers
           FIN:  No more data from sender

   Abstract Data Type: octet
   Data Type Semantics: flags
   ElementId: 6
   Status: current
   Reference: See RFC 793 for a definition of the TCP control bits in
      the TCP header.

5.7.8.  tcpOptions

   Description:
      TCP options in packets of this Flow.  The information is encoded
      in a set of bit fields.  For each TCP option there is a bit in
      this set.  The bit is set to 1 if any observed packet of this Flow
      contains the corresponding TCP option.  Otherwise, if no observed
      packet of this Flow contained the respective TCP option, the value
      of the corresponding bit is 0.
      Options are mapped to bits according to their option numbers.
      Option number X is mapped to bit X. TCP option numbers are
      maintained by IANA.
   Abstract Data Type: unsigned64
   Data Type Semantics: flags







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   ElementId: 209
   Status: current
   Reference: See RFC 793 for the definition of TCP options.  See the
      list of TCP option numbers assigned by IANA at
      http://www.iana.org/assignments/tcp-parameters.

5.8.  Flow Time Stamps

   Information Elements in this section are time stamps of events.

   Time stamps flowStartSeconds, flowEndSeconds, flowStartMilliSeconds,
   flowEndMilliSeconds, flowStartMicroSeconds, flowEndMicroSeconds,
   flowStartNanoSeconds, flowEndNanoSeconds, and
   systemInitTimeMilliSeconds are absolute and have a well defined fixed
   time base, such as, for example, the number of seconds since 0000 UTC
   Jan 1st 1970.

   Time stamps flowStartDeltaMicroSeconds and flowEndDeltaMicroSeconds
   are relative time stamps only valid within the scope of a single
   IPFIX Message.  They contain the negative time offsets relative to
   the export time specified in the IPFIX Message header.

   Time stamps flowStartSysUpTime and flowEndSysUpTime are relative time
   stamps indicating the time relative to the last (re-)initialization
   of the IPFIX Device.  For reporting the time of the last
   (re-)initialization, systemInitTimeMilliSeconds can be reported, for
   example, in Data Records defined by Option Templates.

   +-----+---------------------------+-----+---------------------------+
   |  ID | Name                      |  ID | Name                      |
   +-----+---------------------------+-----+---------------------------+
   | 150 | flowStartSeconds          | 156 | flowStartNanoSeconds      |
   | 151 | flowEndSeconds            | 157 | flowEndNanoSeconds        |
   | 152 | flowStartMilliSeconds     | 158 | flowStartDeltaMicroSeconds|
   | 153 | flowEndMilliSeconds       | 159 | flowEndDeltaMicroSeconds  |
   | 154 | flowStartMicroSeconds     | 160 | systemInitTimeMilliSeconds|
   | 155 | flowEndMicroSeconds       |  22 | flowStartSysUpTime        |
   |     |                           |  21 | flowEndSysUpTime          |
   +-----+---------------------------+-----+---------------------------+

5.8.1.  flowStartSeconds

   Description: The absolute timestamp of the first packet of this Flow.
   Abstract Data Type: dateTimeSeconds







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   ElementId: 150
   Status: current
   Units: seconds

5.8.2.  flowEndSeconds

   Description: The absolute timestamp of the last packet of this Flow.
   Abstract Data Type: dateTimeSeconds
   ElementId: 151
   Status: current
   Units: seconds

5.8.3.  flowStartMilliSeconds

   Description: The absolute timestamp of the first packet of this Flow.
   Abstract Data Type: dateTimeMilliSeconds
   ElementId: 152
   Status: current
   Units: milliseconds

5.8.4.  flowEndMilliSeconds

   Description: The absolute timestamp of the last packet of this Flow.
   Abstract Data Type: dateTimeMilliSeconds
   ElementId: 153
   Status: current
   Units: milliseconds

5.8.5.  flowStartMicroSeconds

   Description: The absolute timestamp of the first packet of this Flow.
   Abstract Data Type: dateTimeMicroSeconds
   ElementId: 154
   Status: current
   Units: microseconds

5.8.6.  flowEndMicroSeconds

   Description: The absolute timestamp of the last packet of this Flow.
   Abstract Data Type: dateTimeMicroSeconds
   ElementId: 155
   Status: current
   Units: microseconds

5.8.7.  flowStartNanoSeconds






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   Description: The absolute timestamp of the first packet of this Flow.
   Abstract Data Type: dateTimeNanoSeconds
   ElementId: 156
   Status: current
   Units: nanoseconds

5.8.8.  flowEndNanoSeconds

   Description: The absolute timestamp of the last packet of this Flow.
   Abstract Data Type: dateTimeNanoSeconds
   ElementId: 157
   Status: current
   Units: nanoseconds

5.8.9.  flowStartDeltaMicroSeconds

   Description: This is a relative time stamp only valid within the
      scope of a single IPFIX Message.  It contains the negative time
      offset of the first observed packet of this Flow relative to the
      export time specified in the IPFIX Message header.
   Abstract Data Type: unsigned32
   ElementId: 158
   Status: current
   Units: microseconds
   Reference: See [I-D.ietf-ipfix-protocol] for the definition of the
      IPFIX Message header.

5.8.10.  flowEndDeltaMicroSeconds

   Description: This is a relative time stamp only valid within the
      scope of a single IPFIX Message.  It contains the negative time
      offset of the last observed packet of this Flow relative to the
      export time specified in the IPFIX Message header.
   Abstract Data Type: unsigned32
   ElementId: 159
   Status: current
   Units: microseconds
   Reference: See [I-D.ietf-ipfix-protocol] for the definition of the
      IPFIX Message header.

5.8.11.  systemInitTimeMilliSeconds

   Description: The absolute timestamp of the last (re-)initialization
      of the IPFIX Device.







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   Abstract Data Type: dateTimeMilliSeconds
   ElementId: 160
   Status: current
   Units: milliseconds

5.8.12.  flowStartSysUpTime

   Description: The relative timestamp of the first packet of this Flow.
      It indicates the number of milliseconds since the last
      (re-)initialization of the IPFIX Device (sysUpTime).
   Abstract Data Type: unsigned32
   ElementId: 22
   Status: current
   Units: milliseconds

5.8.13.  flowEndSysUpTime

   Description: The relative timestamp of the last packet of this Flow.
      It indicates the number of milliseconds since the last
      (re-)initialization of the IPFIX Device (sysUpTime).
   Abstract Data Type: unsigned32
   ElementId: 21
   Status: current
   Units: milliseconds

5.9.  Per-Flow Counters

   Information Elements in this section are counters all having integer
   values.  Their values may change for every report they are used in.
   They cannot serve as part of a Flow Key used for mapping packets to
   Flows.  However, potentially they can be used for selecting exported
   Flows, for example, by only exporting Flows with more than a
   threshold number of observed octets.

   There are running counters and delta counters.  Delta counters are
   reset to zero each time their values are exported.  Running counters
   continue counting independently of the Exporting Process.

   There are per-Flow counters and counters related to the Metering
   Process and/or the Exporting Process.  Per-Flow counters are Flow
   properties that potentially change each time a packet belonging to
   the Flow is observed.  The set of per-Flow counters includes the
   Information Elements listed in the table below.








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   +-----+---------------------------+-----+---------------------------+
   |  ID | Name                      |  ID | Name                      |
   +-----+---------------------------+-----+---------------------------+
   |   1 | octetDeltaCount           | 132 | droppedOctetDeltaCount    |
   |  23 | postOctetDeltaCount       | 133 | droppedPacketDeltaCount   |
   | 198 | octetDeltaSumOfSquares    | 134 | droppedOctetTotalCount    |
   |  85 | octetTotalCount           | 135 | droppedPacketTotalCount   |
   | 171 | postOctetTotalCount       |  19 | postMCastPacketDeltaCount |
   | 199 | octetTotalSumOfSquares    |  20 | postMCastOctetDeltaCount  |
   |   2 | packetDeltaCount          | 174 | postMCastPacketTotalCount |
   |  24 | postPacketDeltaCount      | 175 | postMCastOctetTotalCount  |
   |  86 | packetTotalCount          |     |                           |
   | 172 | postPacketTotalCount      |     |                           |
   +-----+---------------------------+-----+---------------------------+

5.9.1.  octetDeltaCount

   Description:
      The number of octets since the previous report (if any) in
      incoming packets for this Flow at the Observation Point.  The
      number of octets include IP header(s) and IP payload.
   Abstract Data Type: unsigned64
   Data Type Semantics: deltaCounter
   ElementId: 1
   Status: current
   Units: octets

5.9.2.  postOctetDeltaCount

   Description:
      The definition of this Information Element is identical to the
      definition of Information Element 'octetDeltaCount', except that
      it reports a potentially modified value caused by a middlebox
      function after the packet passed the observation point.
   Abstract Data Type: unsigned64
   Data Type Semantics: deltaCounter
   ElementId: 23
   Status: current
   Units: octets

5.9.3.  octetDeltaSumOfSquares

   Description:
      The sum of the squared numbers of octets per incoming packet since
      the previous report (if any) for this Flow at the Observation
      Point.  The number of octets include IP header(s) and IP payload.





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   Abstract Data Type: unsigned64
   ElementId: 198
   Status: current

5.9.4.  octetTotalCount

   Description:
      The total number of octets in incoming packets for this Flow at
      the Observation Point since the Metering Process
      (re-)initialization for this Observation Point.  The number of
      octets include IP header(s) and IP payload.
   Abstract Data Type: unsigned64
   Data Type Semantics: totalCounter
   ElementId: 85
   Status: current
   Units: octets

5.9.5.  postOctetTotalCount

   Description:
      The definition of this Information Element is identical to the
      definition of Information Element 'octetTotalCount', except that
      it reports a potentially modified value caused by a middlebox
      function after the packet passed the observation point.
   Abstract Data Type: unsigned64
   Data Type Semantics: totalCounter
   ElementId: 171
   Status: current
   Units: octets

5.9.6.  octetTotalSumOfSquares

   Description:
      The total sum of the squared numbers of octets in incoming packets
      for this Flow at the Observation Point since the Metering Process
      (re-)initialization for this Observation Point.  The number of
      octets include IP header(s) and IP payload.
   Abstract Data Type: unsigned64
   ElementId: 199
   Status: current
   Units: octets

5.9.7.  packetDeltaCount








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   Description:
      The number of incoming packets since the previous report (if any)
      for this Flow at the Observation Point.
   Abstract Data Type: unsigned64
   Data Type Semantics: deltaCounter
   ElementId: 2
   Status: current
   Units: packets

5.9.8.  postPacketDeltaCount

   Description:
      The definition of this Information Element is identical to the
      definition of Information Element 'packetDeltaCount', except that
      it reports a potentially modified value caused by a middlebox
      function after the packet passed the observation point.
   Abstract Data Type: unsigned64
   Data Type Semantics: deltaCounter
   ElementId: 24
   Status: current
   Units: packets

5.9.9.  packetTotalCount

   Description:
      The total number of incoming packets for this Flow at the
      Observation Point since the Metering Process (re-)initialization
      for this Observation Point.
   Abstract Data Type: unsigned64
   Data Type Semantics: totalCounter
   ElementId: 86
   Status: current
   Units: packets

5.9.10.  postPacketTotalCount

   Description:
      The definition of this Information Element is identical to the
      definition of Information Element 'packetTotalCount', except that
      it reports a potentially modified value caused by a middlebox
      function after the packet passed the observation point.
   Abstract Data Type: unsigned64
   Data Type Semantics: totalCounter
   ElementId: 172







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   Status: current
   Units: packets

5.9.11.  droppedOctetDeltaCount

   Description:
      The number of octets since the previous report (if any) in packets
      of this Flow dropped by packet treatment.  The number of octets
      include IP header(s) and IP payload.
   Abstract Data Type: unsigned64
   Data Type Semantics: deltaCounter
   ElementId: 132
   Status: current
   Units: octets

5.9.12.  droppedPacketDeltaCount

   Description:
      The number of packets since the previous report (if any) of this
      Flow dropped by packet treatment.
   Abstract Data Type: unsigned64
   Data Type Semantics: deltaCounter
   ElementId: 133
   Status: current
   Units: packets

5.9.13.  droppedOctetTotalCount

   Description:
      The total number of octets in packets of this Flow dropped by
      packet treatment since the Metering Process (re-)initialization
      for this Observation Point.  The number of octets include IP
      header(s) and IP payload.
   Abstract Data Type: unsigned64
   Data Type Semantics: totalCounter
   ElementId: 134
   Status: current
   Units: octets

5.9.14.  droppedPacketTotalCount

   Description:
      The number of packets of this Flow dropped by packet treatment
      since the Metering Process (re-)initialization for this
      Observation Point.






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   Abstract Data Type: unsigned64
   Data Type Semantics: totalCounter
   ElementId: 135
   Status: current
   Units: packets

5.9.15.  postMCastPacketDeltaCount

   Description:
      The number of outgoing multicast packets since the previous report
      (if any) sent for packets of this Flow by a multicast daemon
      within the Observation Domain.  This property cannot necessarily
      be observed at the Observation Point, but may be retrieved by
      other means.
   Abstract Data Type: unsigned64
   Data Type Semantics: deltaCounter
   ElementId: 19
   Status: current
   Units: packets

5.9.16.  postMCastOctetDeltaCount

   Description:
      The number of octets since the previous report (if any) in
      outgoing multicast packets sent for packets of this Flow by a
      multicast daemon within the Observation Domain.  This property
      cannot necessarily be observed at the Observation Point, but may
      be retrieved by other means.  The number of octets include IP
      header(s) and IP payload.
   Abstract Data Type: unsigned64
   Data Type Semantics: deltaCounter
   ElementId: 20
   Status: current
   Units: octets

5.9.17.  postMCastPacketTotalCount

   Description:
      The total number of outgoing multicast packets sent for packets of
      this Flow by a multicast daemon within the Observation Domain
      since the Metering Process (re-)initialization.  This property
      cannot necessarily be observed at the Observation Point, but may
      be retrieved by other means.
   Abstract Data Type: unsigned64







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   Data Type Semantics: totalCounter
   ElementId: 174
   Status: current
   Units: packets

5.9.18.  postMCastOctetTotalCount

   Description:
      The total number of octets in outgoing multicast packets sent for
      packets of this Flow by a multicast daemon in the Observation
      Domain since the Metering Process (re-)initialization.  This
      property cannot necessarily be observed at the Observation Point,
      but may be retrieved by other means.  The number of octets include
      IP header(s) and IP payload.
   Abstract Data Type: unsigned64
   Data Type Semantics: totalCounter
   ElementId: 175
   Status: current
   Units: octets

5.10.  Miscellaneous Flow Properties

   Information Elements in this section describe properties of Flows
   that are related to Flow start, Flow duration and Flow termination,
   but they are no time stamps as Information Elements in section 5.8.

   +-----+---------------------------+-----+---------------------------+
   |  ID | Name                      |  ID | Name                      |
   +-----+---------------------------+-----+---------------------------+
   |  36 | flowActiveTimeOut         | 161 | flowDurationMilliSeconds  |
   |  37 | flowInactiveTimeout       | 162 | flowDurationMicroSeconds  |
   | 136 | flowEndReason             |     |                           |
   +-----+---------------------------+-----+---------------------------+

5.10.1.  flowActiveTimeOut

   Description:
      The number of seconds after which an active Flow is timed out
      anyway, even if there is still a continuous flow of packets.
   Abstract Data Type: unsigned16
   ElementId: 36
   Status: current
   Units: seconds

5.10.2.  flowInactiveTimeout






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   Description:
      A Flow is considered to be timed out if no packets belonging to
      the Flow have been observed for the number of seconds specified by
      this field.
   Abstract Data Type: unsigned16
   ElementId: 37
   Status: current
   Units: seconds

5.10.3.  flowEndReason

   Description:
      The reason for Flow termination.  The range of values includes

      0x01: idle timeout
            The flow was terminated because it was considered to be
            idle.
      0x02: active timeout
            The flow was terminated for reporting purposes while it was
            still active, for example, after the maximum lifetime of
            unreported flows was reached.
      0x03: end of Flow detected
            The flow was terminated because the Metering Process
            detected signals indicating the end of the flow,
            for example, the TCP FIN flag.
      0x04: forced end
            The flow was terminated because of some external event,
            for example, a shut down of the Metering Process initiated
            by a network management application.
      0x05: cache full
            the flow was terminated because of lack of resources
            available to the Metering Process and/or the Exporting
            Process

   Abstract Data Type: octet
   Data Type Semantics: identifier
   ElementId: 136
   Status: current

5.10.4.  flowDurationMilliSeconds

   Description: The difference between in time between the observation
      of the first packet of this Flow and the observation of the last
      packet of this Flow.







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   Abstract Data Type: unsigned32
   ElementId: 161
   Status: current
   Units: milliseconds

5.10.5.  flowDurationMicroSeconds

   Description: The difference between in time between the observation
      of the first packet of this Flow and the observation of the last
      packet of this Flow.
   Abstract Data Type: unsigned32
   ElementId: 162
   Status: current
   Units: microseconds

5.11.  Padding

   This section contains a single Information Element only, that can be
   used for padding of Flow Records.

   IPFIX Implementations may wish to align Information Elements within
   Data Records or to align entire Data Records to 4 octet or 8 octet
   boundaries.  This can be achieved by including one or more
   paddingOctets Information Elements in a Data Record.

   +-----+---------------------------+-----+---------------------------+
   |  ID | Name                      |  ID | Name                      |
   +-----+---------------------------+-----+---------------------------+
   | 210 | paddingOctets             |     |                           |
   +-----+---------------------------+-----+---------------------------+

5.11.1.  paddingOctets

   Description:
      The value of this Information Element is always 0.
   Abstract Data Type: octetArray
   ElementId: 210
   Status: current


6.  Extending the Information Model

   A key requirement for IPFIX is to allow for extending the set of
   Information Elements which are reported.  This section defines the
   mechanism for extending this set.

   Extension is done by defining new Information Elements.  Each new
   Information Element MUST be assigned a unique Information Element



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   identifier as part of its definition.  These unique Information
   Element identifiers are the connection between the record structure
   communicated by the protocol using templates and a consuming
   application.  For generally applicable Information Elements using
   IETF and IANA mechanisms for extending the information model is
   recommended.

   Names of new Information Elements SHOULD be chosen according to the
   naming conventions given in section 2.3.

   For extensions, the type space defined in section 3 can be used.  If
   required, new data types can be added.  New data types SHOULD be
   defined in IETF standards track documents.

   Enterprises may wish to define Information Elements without
   registering them with IANA.  IPFIX explicitly supports enterprise-
   specific Information Elements.  Enterprise-specific Information
   Elements as described in sections 2.1 and 4.

   However, before creating enterprise-specific Information Elements,
   the general applicability of such Information Elements should be
   considered.  IPFIX does not support enterprise-specific data types.


7.  IANA Considerations

   This documents defines an initial set of IPFIX Information Elements.
   For extending them in the future, IANA needs to create a new registry
   for IPFIX Information Element identifiers.

   New assignments for IPFIX Information Elements will be administered
   by IANA, on a First Come First Served basis [RFC2434], subject to
   Expert Review [RFC2434], i.e. review by one of a group of experts
   designated by an IETF Operations and Management Area Director.  The
   group of experts must double check the Information Elements
   definitions with already defined Information Elements for
   completeness, accuracy, redundancy, and correct naming following the
   naming conventions in section 2.3.  Those experts will initially be
   drawn from the Working Group Chairs and document editors of the IPFIX
   and PSAMP Working Groups.

   Appendix B defines an XML schema which may be used to create
   consistent machine readable extensions to the IPFIX information
   model.  This schema introduces a new namespace, which will be
   assigned by IANA according to RFC 3688.  Currently the name space for
   this schema is identified as http://www.ietf.org/ipfix.





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8.  Security Considerations

   The IPFIX information model itself does not directly introduce
   security issues.  Rather it defines a set of attributes which may for
   privacy or business issues be considered sensitive information.

   The underlying protocol used to exchange the information described
   here must therefore apply appropriate procedures to guarantee the
   integrity and confidentiality of the exported information.  Such
   protocols are defined in separate documents, specifically the IPFIX
   protocol document [I-D.ietf-ipfix-protocol].


9.  Acknowledgements

   The editors thank Paul Callato for creating the initial version of
   this document, Thomas Dietz for developing the XSLT scripts that
   generate large portions of the text part of this document from the
   XML appendices, and Paul Aitken for a very detailed review that
   helped improving the document significantly.


10.  References

10.1.  Normative References

   [I-D.ietf-ipfix-protocol]
              Claise, B., "IPFIX Protocol Specification",
              draft-ietf-ipfix-protocol-12 (work in progress),
              April 2005.

10.2.  Informative References

   [I-D.ietf-ipfix-architecture]
              Sadasivan, G., Brownlee, N., Claise, B., and J. Quittek,
              "Architecture for IP Flow Information Export",
              draft-ietf-ipfix-architecture-07 (work in progress),
              March 2005.

   [I-D.ietf-ipfix-as]
              Zseby, T., Boschi, E., Brownlee, N., and B. Claise, "IPFIX
              Applicability", draft-ietf-ipfix-as-04 (work in progress),
              February 2005.

   [IEEE.754.1985]
              Institute of Electrical and Electronics Engineers,
              "Standard for Binary Floating-Point Arithmetic",
              IEEE Standard 754, August 1985.



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   [IEEE.802-11.1999]
              "Information technology - Telecommunications and
              information exchange between systems - Local and
              metropolitan area networks - Specific requirements - Part
              11: Wireless LAN Medium Access Control (MAC) and Physical
              Layer (PHY) specifications", IEEE Standard 802.11, 1999,
              <http://standards.ieee.org/getieee802/download/
              802.11-1999.pdf>.

   [IEEE.802-3.2002]
              "Information technology - Telecommunications and
              information exchange between systems - Local and
              metropolitan area networks - Specific requirements - Part
              3: Carrier sense multiple access with collision detection
              (CSMA/CD) access method and physical layer
              specifications"", IEEE Standard 802.3, September 2002.

   [IEEE.P802-1Q.2003]
              Institute of Electrical and Electronics Engineers, "Local
              and Metropolitan Area Networks: Virtual Bridged Local Area
              Networks", IEEE Standard 802.1Q, March 2003.

   [ISO.10646-1.1993]
              International Organization for Standardization,
              "Information Technology - Universal Multiple-octet coded
              Character Set (UCS) - Part 1: Architecture and Basic
              Multilingual Plane", ISO Standard 10646-1, May 1993.

   [ISO.646.1991]
              International Organization for Standardization,
              "Information technology - ISO 7-bit coded character set
              for information interchange", ISO Standard 646, 1991.

   [RFC0768]  Postel, J., "User Datagram Protocol", STD 6, RFC 768,
              August 1980.

   [RFC0791]  Postel, J., "Internet Protocol", STD 5, RFC 791,
              September 1981.

   [RFC0792]  Postel, J., "Internet Control Message Protocol", STD 5,
              RFC 792, September 1981.

   [RFC0793]  Postel, J., "Transmission Control Protocol", STD 7,
              RFC 793, September 1981.

   [RFC1771]  Rekhter, Y. and T. Li, "A Border Gateway Protocol 4
              (BGP-4)", RFC 1771, March 1995.




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   [RFC1812]  Baker, F., "Requirements for IP Version 4 Routers",
              RFC 1812, June 1995.

   [RFC1930]  Hawkinson, J. and T. Bates, "Guidelines for creation,
              selection, and registration of an Autonomous System (AS)",
              BCP 6, RFC 1930, March 1996.

   [RFC2236]  Fenner, W., "Internet Group Management Protocol, Version
              2", RFC 2236, November 1997.

   [RFC2402]  Kent, S. and R. Atkinson, "IP Authentication Header",
              RFC 2402, November 1998.

   [RFC2406]  Kent, S. and R. Atkinson, "IP Encapsulating Security
              Payload (ESP)", RFC 2406, November 1998.

   [RFC2434]  Narten, T. and H. Alvestrand, "Guidelines for Writing an
              IANA Considerations Section in RFCs", BCP 26, RFC 2434,
              October 1998.

   [RFC2460]  Deering, S. and R. Hinden, "Internet Protocol, Version 6
              (IPv6) Specification", RFC 2460, December 1998.

   [RFC2463]  Conta, A. and S. Deering, "Internet Control Message
              Protocol (ICMPv6) for the Internet Protocol Version 6
              (IPv6) Specification", RFC 2463, December 1998.

   [RFC2547]  Rosen, E. and Y. Rekhter, "BGP/MPLS VPNs", RFC 2547,
              March 1999.

   [RFC2629]  Rose, M., "Writing I-Ds and RFCs using XML", RFC 2629,
              June 1999.

   [RFC2863]  McCloghrie, K. and F. Kastenholz, "The Interfaces Group
              MIB", RFC 2863, June 2000.

   [RFC2960]  Stewart, R., Xie, Q., Morneault, K., Sharp, C.,
              Schwarzbauer, H., Taylor, T., Rytina, I., Kalla, M.,
              Zhang, L., and V. Paxson, "Stream Control Transmission
              Protocol", RFC 2960, October 2000.

   [RFC3031]  Rosen, E., Viswanathan, A., and R. Callon, "Multiprotocol
              Label Switching Architecture", RFC 3031, January 2001.

   [RFC3032]  Rosen, E., Tappan, D., Fedorkow, G., Rekhter, Y.,
              Farinacci, D., Li, T., and A. Conta, "MPLS Label Stack
              Encoding", RFC 3032, January 2001.




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   [RFC3036]  Andersson, L., Doolan, P., Feldman, N., Fredette, A., and
              B. Thomas, "LDP Specification", RFC 3036, January 2001.

   [RFC3234]  Carpenter, B. and S. Brim, "Middleboxes: Taxonomy and
              Issues", RFC 3234, February 2002.

   [RFC3260]  Grossman, D., "New Terminology and Clarifications for
              Diffserv", RFC 3260, April 2002.

   [RFC3667]  Bradner, S., "IETF Rights in Contributions", RFC 3667,
              February 2004.

   [RFC3668]  Bradner, S., "Intellectual Property Rights in IETF
              Technology", RFC 3668, February 2004.

   [RFC3917]  Quittek, J., Zseby, T., Claise, B., and S. Zander,
              "Requirements for IP Flow Information Export (IPFIX)",
              RFC 3917, October 2004.

   [RFC3954]  Claise, B., "Cisco Systems NetFlow Services Export Version
              9", RFC 3954, October 2004.


Appendix A.  Formal Specification of IPFIX Information Element

   This appendix contains a formal description of the IPFIX information
   model XML document.  Note that this appendix is of informational
   nature, while the text in section 4 generated from this appendix is
   normative.

   Using a formal and machine readable syntax for the Information model
   enables the creation of IPFIX aware tools which can automatically
   adapt to extensions to the information model, by simply reading
   updated information model specifications.

   The wide availability of XML aware tools and libraries for client
   devices is a primary consideration for this choice.  In particular
   libraries for parsing XML documents are readily available.  Also
   mechanisms such as the Extensible Stylesheet Language (XSL) allow for
   transforming a source XML document into other documents.  This draft
   was authored in XML and transformed according to RFC2629.

   It should be noted that the use of XML in Exporters, Collectors or
   other tools is not mandatory for the deployment of IPFIX.  In
   particular Exporting Processes do not produce or consume XML as part
   of their operation.  It is expected that IPFIX Collectors MAY take
   advantage of the machine readability of the Information Model vs.
   hard coding their behavior or inventing proprietary means for



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   accommodating extensions.




   <fieldDefinitions>

     <field name="ipVersion" dataType="octet"
            group="IpHeader"
            dataTypeSemantics="identifier"
            fieldId="60" applicability="all" status="current">
       <description>
         The IP version field in the IP packet header.
       </description>
       <reference>
         <paragraph>
         See RFC 791 for a definition of the version field in the
         IPv4 packet header.
         See RFC 2460 for a definition of the version field in the
         IPv6 packet header.
         Additional information on defined version numbers
         can be found at
         http://www.iana.org/assignments/version-numbers.
         </paragraph>
       </reference>
     </field>

     <field name="sourceIPv4Address" dataType="ipv4Address"
            group="IpHeader"
            dataTypeSemantics="identifier"
            fieldId="8" applicability="all" status="current">
       <description>
         <paragraph>
         The IPv4 source address in the IP packet header.
         </paragraph>
       </description>
       <reference>
         See RFC 791 for the definition of the IPv4 source address
         field.
       </reference>
     </field>

     <field name="sourceIPv6Address" dataType="ipv6Address"
            group="IpHeader"
            dataTypeSemantics="identifier"
            fieldId="27" applicability="all" status="current">
       <description>
         <paragraph>



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         The IPv6 source address in the IP packet header.
         </paragraph>
       </description>
     </field>

     <field name="sourceIPv4Mask" dataType="octet"
            group="IpHeader"
            fieldId="9" applicability="option" status="current">
       <description>
         <paragraph>
         The number of contiguous bits that are relevant in the
         sourceIPv4Prefix Information Element.
         </paragraph>
       </description>
       <units>bits</units>
       <range>0-32</range>
     </field>

     <field name="sourceIPv6Mask" dataType="octet"
            group="IpHeader"
            fieldId="29" applicability="option" status="current">
       <description>
         <paragraph>
         The number of contiguous bits that are relevant in the
         sourceIPv6Prefix Information Element.
         </paragraph>
       </description>
       <units>bits</units>
       <range>0-128</range>
     </field>

     <field name="sourceIPv4Prefix" dataType="ipv4Address"
            group="IpHeader"
            fieldId="44" applicability="data" status="current">
       <description>
         <paragraph>
         IPv4 source address prefix.
         </paragraph>
       </description>
     </field>

     <field name="sourceIPv6Prefix" dataType="ipv6Address"
            group="IpHeader"
            fieldId="170" applicability="data" status="current">
       <description>
         <paragraph>
         IPv6 source address prefix.
         </paragraph>



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       </description>
     </field>

     <field name="destinationIPv4Address" dataType="ipv4Address"
            group="IpHeader"
            dataTypeSemantics="identifier"
            fieldId="12" applicability="all" status="current">
       <description>
         <paragraph>
         The IPv4 destination address in the IP packet header.
         </paragraph>
       </description>
       <reference>
         See RFC 791 for the definition of the IPv4 destination address
         field.
       </reference>
     </field>

     <field name="destinationIPv6Address" dataType="ipv6Address"
            group="IpHeader"
            dataTypeSemantics="identifier"
            fieldId="28" applicability="all" status="current">
       <description>
         <paragraph>
         The IPv6 destination address in the IP packet header.
         </paragraph>
       </description>
     </field>

     <field name="destinationIPv4Mask" dataType="octet"
            group="IpHeader"
            fieldId="13" applicability="option" status="current">
       <description>
         <paragraph>
         The number of contiguous bits that are relevant in the
         destinationIPv4Prefix Information Element.
         </paragraph>
       </description>
       <units>bits</units>
       <range>0-32</range>
     </field>

     <field name="destinationIPv6Mask" dataType="octet"
            group="IpHeader"
            fieldId="30" applicability="option" status="current">
       <description>
         <paragraph>
         The number of contiguous bits that are relevant in the



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         destinationIPv6Prefix Information Element.
         </paragraph>
       </description>
       <units>bits</units>
       <range>0-128</range>
     </field>

     <field name="destinationIPv4Prefix" dataType="ipv4Address"
            group="IpHeader"
            fieldId="45" applicability="data" status="current">
       <description>
         <paragraph> IPv4 destination address prefix. </paragraph>
       </description>
     </field>

     <field name="destinationIPv6Prefix" dataType="ipv6Address"
            group="IpHeader"
            fieldId="169" applicability="data" status="current">
       <description>
         <paragraph> IPv6 destination address prefix. </paragraph>
       </description>
     </field>

     <field name="ipTimeToLive" dataType="octet"
            group="IpHeader"
            fieldId="192" applicability="all" status="current">
       <description>
         <paragraph>
         For IPv4, the value of the Information Element matches
         the value of the Time to Live field in the IPv4 packet
         header.  For IPv6, the value of the Information Element
         matches the value of the Hop Limit field in the IPv6
         packet header.
         </paragraph>
       </description>
       <reference>
         See RFC 791 for the definition of the IPv4 Time to Live
         field.
         See RFC 2460 for the definition of the IPv6 Hop Limit
         field.
       </reference>
       <units>hops</units>
     </field>

     <field name="protocolIdentifier" dataType="octet"
            group="IpHeader"
            dataTypeSemantics="identifier"
            fieldId="4" applicability="all" status="current">



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       <description>
         <paragraph>
         The value of the protocol number in the IP packet header.
         The protocol number identifies the IP packet payload type.
         Protocol numbers are defined in the IANA Protocol Numbers
         registry.</paragraph>

         <paragraph>
         In Internet Protocol version 4 (IPv4) this is carried in the
         "Protocol" field. In Internet Protocol version 6 (IPv6) this
         is carried in the "Next Header" field in the last extension
         header of the packet.</paragraph>
       </description>
       <reference>
         <paragraph>
         See RFC 791 for the specification of the IPv4 protocol field.
         See RFC 2460 for the specification of the IPv6 protocol field.
         See the list of protocol numbers assigned by IANA at
         http://www.iana.org/assignments/protocol-numbers.
         </paragraph>
       </reference>
     </field>

     <field name="nextHeaderIPv6" dataType="octet"
            group="IpHeader"
            fieldId="193" applicability="all" status="current">
       <description>
         <paragraph>
         The value of the Next Header field of the IPv6 header.
         The value identifies the type of the following IPv6
         extension header or of the following IP payload.
         Valid values are defined in the IANA
         Protocol Numbers registry.
         </paragraph>
       </description>
       <reference>
         See RFC 2460 for the definition of the IPv6 Next Header field.
         See the list of protocol numbers assigned by IANA at
         http://www.iana.org/assignments/protocol-numbers.
       </reference>
     </field>

     <field name="ipClassOfService" dataType="octet"
            group="IpHeader"
            dataTypeSemantics="identifier"
            fieldId="194" applicability="all" status="current">
       <description>
         <paragraph>



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         For IPv4 packets, this is the value of the TOS field in
         the IPv4 packet header. For IPv6 packets, this is the
         value of the Traffic Class field in the IPv6 packet header.
         </paragraph>
       </description>
       <reference>
         See section 5.3.2 of RFC 1812 and RFC 791 for the
         definition of the IPv4 TOS field.
         See RFC 2460 for the definition of the IPv6 Traffic Class
         field.
       </reference>
     </field>

     <field name="ipDiffServCodePoint" dataType="octet"
            group="IpHeader"
            dataTypeSemantics="identifier"
            fieldId="195" applicability="all" status="current">
       <description>
         <paragraph>
         The value of a Differentiated Services Code Point (DSCP)
         encoded in the Differentiated Services Field. The
         Differentiated Services Field spans the most significant
         6 bits of the IPv4 TOS field or the IPv6 Traffic class
         field, respectively.
         </paragraph>
         <paragraph>
         This Information Element encodes only the 6 bits of the
         Differentiated Services field. Therefore its value may
         range from 0 to 63.
         </paragraph>
       </description>
       <range>0-63</range>
       <reference>
         See RFC 3260 for the definition of the Differentiated
         Services Field.
         See section 5.3.2 of RFC 1812 and RFC 791 for the
         definition of the IPv4 TOS field.
         See RFC 2460 for the definition of the IPv6 Traffic Class
         field.
       </reference>
     </field>

     <field name="ipPrecedence" dataType="octet"
            group="IpHeader"
            dataTypeSemantics="identifier"
            fieldId="196" applicability="all" status="current">
       <description>
         <paragraph>



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         The value of the IP Precedence.  The IP Precedence value
         is encoded in the first 3 bits of the IPv4 TOS field
         or the IPv6 Traffic class field, respectively.
         </paragraph>
         <paragraph>
         This Information Element encodes only the 3 bits of the
         Differentiated Services field. Therefore its value may
         range from 0 to 7.
         </paragraph>
       </description>
       <range>0-7</range>
       <reference>
         See section 5.3.3 of RFC 1812 and RFC 791 for the
         definition of the IP Precedence.
         See section 5.3.2 of RFC 1812 and RFC 791 for the
         definition of the IPv4 TOS field.
         See RFC 2460 for the definition of the IPv6 Traffic Class
         field.
       </reference>
     </field>

     <field name="classOfServiceIPv4" dataType="octet"
            group="IpHeader"
            dataTypeSemantics="identifier"
            fieldId="5" applicability="all" status="current">
       <description>
         <paragraph>
         The value of the TOS field in the IPv4 packet header.
         </paragraph>
       </description>
       <reference>
         See RFC 791 for the definition of the IPv4 TOS field.
       </reference>
     </field>

     <field name="postClassOfServiceIPv4" dataType="octet"
            group="IpHeader"
            dataTypeSemantics="identifier"
            fieldId="55" applicability="all" status="current">
       <description>
         <paragraph>
         The definition of this Information Element is identical
         to the definition of Information Element
         'classOfServiceIPv4', except that it reports a
         potentially modified value caused by a middlebox
         function after the packet passed the observation point.
         </paragraph>
       </description>



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       <reference>
         See RFC 791 for the definition of the IPv4 TOS field.
         See RFC 3234 for the definition of middleboxes.
       </reference>
     </field>

     <field name="classOfServiceIPv6" dataType="octet"
            group="IpHeader"
            dataTypeSemantics="identifier"
            fieldId="137" applicability="data" status="current">
       <description>
         <paragraph>
         The value of the Traffic Class field in the
         IPv6 packet header.
         </paragraph>
       </description>
       <reference>
         See RFC 2460 for the definition of the IPv6 Traffic Class
         field.
       </reference>
     </field>

     <field name="postClassOfServiceIPv6" dataType="octet"
            group="IpHeader"
            dataTypeSemantics="identifier"
            fieldId="138" applicability="data" status="current">
       <description>
         <paragraph>
         The definition of this Information Element is identical
         to the definition of Information Element
         'classOfServiceIPv6', except that it reports a
         potentially modified value caused by a middlebox
         function after the packet passed the observation point.
         </paragraph>
       </description>
       <reference>
         See RFC 2460 for the definition of the IPv6 traffic class
         field.
       </reference>
     </field>

     <field name="flowLabelIPv6" dataType="unsigned32"
            group="IpHeader"
            dataTypeSemantics="identifier"
            fieldId="31" applicability="all" status="current">
       <description>
         <paragraph>
         The value of the IPv6 Flow Label field in the IP packet header.



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         </paragraph>
       </description>
       <reference>
         See RFC 2460 for a definition of the flow label field in the
         IPv6 packet header.
       </reference>
     </field>

     <field name="isMulticast" dataType="octet"
            group="IpHeader"
            dataTypeSemantics="flags"
            fieldId="206" applicability="data" status="current">
       <description>
         <paragraph>
           If the IP destination address is a reserved multicast
           address then the value of this Information Element is
           not equal to zero.  Otherwise, the value of all bits
           of the octet is zero.
         </paragraph>
         <paragraph>
           The first bit of this octet is set to 1 if the Version
           field of the IP header has the value 4 and if the
           Destination Address field contains a reserved multicast
           address in the range from 224.0.0.0 to 239.255.255.255.
           Otherwise, this bit is set to 0.
         </paragraph>
         <paragraph>
           The second and third bit of this octet are reserved for
           future use.
         </paragraph>
         <paragraph>
           The remaining bits of the octet are only set to values
           other than zero if th IP Destination Address is a
           reserved IPv6 multicast address. Then the fourth bit
           of the octet is set to the value of the T flag in the
           IPv6 multicast address and the remaining four bits are
           set to the value of the scope field in the IPv6
           multicast address.
         </paragraph>
         <artwork>
             0      1      2      3      4      5      6      7
          +------+------+------+------+------+------+------+------+
          | MCv4 | RES. | RES. |  T   |   IPv6 multicast scope    |
          +------+------+------+------+------+------+------+------+

          Bit 0:    set to 1 if IPv4 multicast
          Bit 1-2:  reserved for future use
          Bit 4:    set to value of T-flag, if IPv6 multicast



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          Bit 4-7:  set to value of multicast scope if IPv6 multicast
         </artwork>
       </description>
       <reference>
         See RFC 1112 for the specification of reserved IPv4 multicast
         addresses.
         See RFC 3513 for the specification of reserved IPv6 multicast
         addresses and the definition of the T-flag and the IPv6
         multicast scope.
       </reference>
     </field>

     <field name="identificationIPv4" dataType="unsigned16"
            group="IpHeader"
            dataTypeSemantics="identifier"
            fieldId="54" applicability="data" status="current">
       <description>
         <paragraph>
         The value of the IPv4 packet identification field
         in the IP packet header.
         </paragraph>
       </description>
       <reference>
         See RFC 791 for the definition of the IPv4 identification
         field.
       </reference>
     </field>

       <field name="fragmentOffsetIPv4" dataType="unsigned16"
            group="IpHeader"
            dataTypeSemantics="identifier"
            fieldId="88" applicability="all" status="current">
       <description>
         <paragraph>
         The value of the IPv4 fragment offset field
         in the IP packet header.
         </paragraph>
       </description>
       <reference>
         <paragraph>
         See RFC 791 for the specification of the IPv4 fragment offset.
         </paragraph>
       </reference>
     </field>

       <field name="fragmentFlagsIPv4" dataType="octet"
            group="IpHeader"
            dataTypeSemantics="flags"



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            fieldId="197" applicability="all" status="current">
       <description>
         <paragraph>
         The value of the fragmentation bits
         in the IPv4 packet header.
         </paragraph>
         <artwork>
         Bit 0:    reserved, must be zero.
         Bit 1:    (DF) 0 = May Fragment,  1 = Don't Fragment.
         Bit 2:    (MF) 0 = Last Fragment, 1 = More Fragments.
         Bits 3-7: (DC) Don't Care, value is irrelevant.

             0   1   2   3   4   5   6   7
           +---+---+---+---+---+---+---+---+
           |   | D | M | D | D | D | D | D |
           | 0 | F | F | C | C | C | C | C |
           +---+---+---+---+---+---+---+---+
         </artwork>
       </description>
       <reference>
         <paragraph>
         See RFC 791 for the specification of the IPv4 fragment flags.
         </paragraph>
       </reference>
     </field>

       <field name="ipHeaderLength" dataType="octet"
            group="IpHeader"
            fieldId="189" applicability="all" status="current">
       <description>
         <paragraph>
         The length of the IP header.  For IPv6, the value of this
         Information Element is 40.
         </paragraph>
       </description>
       <reference>
         <paragraph>
         See RFC 791 for the specification of the IPv4 header.
         See RFC 2460 for the specification of the IPv6 header.
         </paragraph>
       </reference>
       <units>octets</units>
     </field>

       <field name="headerLengthIPv4" dataType="octet"
            group="IpHeader"
            fieldId="213" applicability="all" status="current">
       <description>



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         <paragraph>
         The length of the IPv4 header.
         </paragraph>
       </description>
       <reference>
         <paragraph>
         See RFC 791 for the specification of the IPv4 header.
         </paragraph>
       </reference>
       <units>octets</units>
     </field>

       <field name="internetHeaderLengthIPv4" dataType="octet"
            group="IpHeader"
            fieldId="207" applicability="all" status="current">
       <description>
         <paragraph>
         The value of the Internet Header Length (IHL) field in
         the IPv4 header. It specifies the length of the header
         in units of 4 octets.
         </paragraph>
       </description>
       <reference>
         <paragraph>
         See RFC 791 for the specification of the IPv4 header.
         </paragraph>
       </reference>
       <units>4 octets</units>
     </field>

       <field name="totalLengthIPv4" dataType="unsigned16"
            group="IpHeader"
            fieldId="190" applicability="all" status="current">
       <description>
         <paragraph>
         The total length of the IPv4 packet.
         </paragraph>
       </description>
       <reference>
         <paragraph>
         See RFC 791 for the specification of the IPv4 total length.
         </paragraph>
       </reference>
       <units>octets</units>
     </field>

       <field name="payloadLengthIPv6" dataType="unsigned32"
            group="IpHeader"



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            fieldId="191" applicability="all" status="current">
       <description>
         <paragraph>
         The length of the IPv6 payload, i.e., the rest of the
         packet following the IPv6 header, in octets.  Note that any
         extension headers present are considered part
         of the payload, i.e., included in the length count.
         </paragraph>
         <paragraph>
         This Information Element reports the value of the Payload
         Length field in the IPv6 header except in the case that
         the value of this field is zero and that there is a valid
         jumbo payload option. Then the value of the Jumbo Payload
         Length field in the jumbo payload option is reported.
         </paragraph>
       </description>
       <reference>
         <paragraph>
         See RFC 2460 for the specification of the IPv6 payload length.
         See RFC 2675 for the specification of the IPv6 jumbo payload
         length.
         </paragraph>
       </reference>
     </field>

       <field name="ipPayloadLength" dataType="unsigned64"
            group="IpHeader"
            fieldId="204" applicability="all" status="current">
       <description>
         <paragraph>
         The effective length of the IP payload.
         </paragraph>
         <paragraph>
         For IPv4 packets the value of this Information Element is
         the difference between the total length of the IPv4 packet
         (as reported by Information Element totalLengthIPv4) and the
         length of the IPv4 header (as reported by Information Element
         headerLengthIPv4).
         </paragraph>
         <paragraph>
         For IPv6, the value of the Payload Length field
         in the IPv6 header is reported except in the case that
         the value of this field is zero and that there is a valid
         jumbo payload option. In this case the value of the
         Jumbo Payload Length field in the jumbo payload option
         is reported.
         </paragraph>
       </description>



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       <reference>
         <paragraph>
         See RFC 791 for the specification of IPv4 packets.
         See RFC 2460 for the specification of the IPv6 payload length.
         See RFC 2675 for the specification of the IPv6 jumbo payload
         length.
         </paragraph>
       </reference>
     </field>

     <field name="sourceTransportPort" dataType="unsigned16"
            group="transportHeader"
            dataTypeSemantics="identifier"
            fieldId="7" applicability="all" status="current">
       <description>
         <paragraph>
         The source port identifier in the transport header.
         For the transport
         protocols UDP, TCP and SCTP this is the source port number
         given in the respective header.  This field MAY also be used
         for future transport protocols that have 16 bit source port
         identifiers.
         </paragraph>
       </description>
       <reference>
         <paragraph>
         See RFC 768 for the definition of the UDP source port field.
         See RFC 793 for the definition of the TCP source port field.
         See RFC 2960 for the definition of SCTP.</paragraph>
         <paragraph>
         Additional information on defined UDP and TCP port numbers can
         be found at http://www.iana.org/assignments/port-numbers.
         </paragraph>
       </reference>
     </field>

     <field name="destinationTransportPort" dataType="unsigned16"
            group="transportHeader"
            dataTypeSemantics="identifier"
            fieldId="11" applicability="all" status="current">
       <description>
         <paragraph>
         The destination port identifier in the transport header.
         For the transport protocols UDP, TCP and SCTP this is the
         destination port number given in the respective header.
         This field MAY also be used for future transport protocols
         that have 16 bit destination port identifiers.
         </paragraph>



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       </description>
       <reference>
         <paragraph>
         See RFC 768 for the definition of the UDP source port field.
         See RFC 793 for the definition of the TCP source port field.
         See RFC 2960 for the definition of SCTP.  </paragraph>

         <paragraph>
         Additional information on defined UDP and TCP port numbers can
         be found at http://www.iana.org/assignments/port-numbers.
         </paragraph>
       </reference>
     </field>

     <field name="udpSourcePort" dataType="unsigned16"
            group="transportHeader"
            dataTypeSemantics="identifier"
            fieldId="180" applicability="all" status="current">
       <description>
         The source port identifier in the UDP header.
       </description>
       <reference>
         See RFC 768 for the definition of the UDP source port field.
         Additional information on defined UDP port numbers can
         be found at http://www.iana.org/assignments/port-numbers.
       </reference>
     </field>

     <field name="udpDestinationPort" dataType="unsigned16"
            group="transportHeader"
            dataTypeSemantics="identifier"
            fieldId="181" applicability="all" status="current">
       <description>
         The destination port identifier in the UDP header.
       </description>
       <reference>
         See RFC 768 for the definition of the UDP source port field.
         Additional information on defined UDP port numbers can
         be found at http://www.iana.org/assignments/port-numbers.
       </reference>
     </field>

     <field name="udpMessageLength" dataType="unsigned16"
            group="transportHeader"
            fieldId="205" applicability="all" status="current">
       <description>
         The value of the Length field in the UDP header.
       </description>



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       <reference>
         See RFC 768 for the specification of the UDP header.
       </reference>
       <units>octets</units>
     </field>

     <field name="tcpSourcePort" dataType="unsigned16"
            group="transportHeader"
            dataTypeSemantics="identifier"
            fieldId="182" applicability="all" status="current">
       <description>
         The source port identifier in the TCP header.
       </description>
       <reference>
         See RFC 793 for the definition of the TCP source port field.
         Additional information on defined TCP port numbers can
         be found at http://www.iana.org/assignments/port-numbers.
       </reference>
     </field>

     <field name="tcpDestinationPort" dataType="unsigned16"
            group="transportHeader"
            dataTypeSemantics="identifier"
            fieldId="183" applicability="all" status="current">
       <description>
         The destination port identifier in the TCP header.
       </description>
       <reference>
         See RFC 793 for the definition of the TCP source port field.
         Additional information on defined TCP port numbers can
         be found at http://www.iana.org/assignments/port-numbers.
       </reference>
     </field>

     <field name="tcpSequenceNumber" dataType="unsigned32"
            group="transportHeader"
            fieldId="184" applicability="all" status="current">
       <description>
         The sequence number in the TCP header.
       </description>
       <reference>
         See RFC 793 for the definition of the TCP sequence number.
       </reference>
     </field>

     <field name="tcpAcknowledgementNumber" dataType="unsigned32"
            group="transportHeader"
            fieldId="185" applicability="all" status="current">



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       <description>
         The acknowledgement number in the TCP header.
       </description>
       <reference>
         See RFC 793 for the definition of the TCP acknowledgement
         number.
       </reference>
     </field>

     <field name="tcpWindowSize" dataType="unsigned16"
            group="transportHeader"
            fieldId="186" applicability="all" status="current">
       <description>
         The window field in the TCP header.
       </description>
       <reference>
         See RFC 793 for the definition of the TCP window field.
       </reference>
     </field>

     <field name="tcpUrgentPointer" dataType="unsigned16"
            group="transportHeader"
            fieldId="187" applicability="all" status="current">
       <description>
         The urgent pointer in the TCP header.
       </description>
       <reference>
         See RFC 793 for the definition of the TCP urgent pointer.
       </reference>
     </field>

     <field name="tcpHeaderLength" dataType="unsigned16"
            group="transportHeader"
            fieldId="188" applicability="all" status="current">
       <description>
         The length of the TCP header.
       </description>
       <reference>
         See RFC 793 for the definition of the TCP header.
       </reference>
       <units>octets</units>
     </field>

     <field name="icmpTypeCodeIPv4" dataType="unsigned16"
            group="transportHeader"
            dataTypeSemantics="identifier"
            fieldId="32" applicability="all" status="current">
       <description>



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         <paragraph>
         Type and Code of the IPv4 ICMP message. The combination of
         both values is reported as (ICMP type * 256) + ICMP code.
         </paragraph>
       </description>
       <reference>
         See RFC 792 for a definition of the IPv4 ICMP type and code
         fields.
       </reference>
     </field>

     <field name="icmpTypeIPv4" dataType="octet"
            group="transportHeader"
            dataTypeSemantics="identifier"
            fieldId="176" applicability="all" status="current">
       <description>
         <paragraph>
         Type of the IPv4 ICMP message.
         </paragraph>
       </description>
       <reference>
         See RFC 792 for a definition of the IPv4 ICMP type field.
       </reference>
     </field>

     <field name="icmpCodeIPv4" dataType="octet"
            group="transportHeader"
            dataTypeSemantics="identifier"
            fieldId="177" applicability="all" status="current">
       <description>
         <paragraph>
         Code of the IPv4 ICMP message.
         </paragraph>
       </description>
       <reference>
         See RFC 792 for a definition of the IPv4 ICMP code field.
       </reference>
     </field>

     <field name="icmpTypeCodeIPv6" dataType="unsigned16"
            group="transportHeader"
            dataTypeSemantics="identifier"
            fieldId="139" applicability="all" status="current">
       <description>
         <paragraph>
         Type and Code of the IPv6 ICMP message. The combination of
         both values is reported as (ICMP type * 256) + ICMP code.
         </paragraph>



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       </description>
       <reference>
         See RFC 2463 for a definition of the IPv6 ICMP type and code
         fields.
       </reference>
     </field>

     <field name="icmpTypeIPv6" dataType="octet"
            group="transportHeader"
            dataTypeSemantics="identifier"
            fieldId="178" applicability="all" status="current">
       <description>
         <paragraph>
         Type of the IPv6 ICMP message.
         </paragraph>
       </description>
       <reference>
         See RFC 2463 for a definition of the IPv6 ICMP type field.
       </reference>
     </field>

     <field name="icmpCodeIPv6" dataType="octet"
            group="transportHeader"
            dataTypeSemantics="identifier"
            fieldId="179" applicability="all" status="current">
       <description>
         <paragraph>
         Code of the IPv6 ICMP message.
         </paragraph>
       </description>
       <reference>
         See RFC 2463 for a definition of the IPv6 ICMP code field.
       </reference>
     </field>

     <field name="igmpType" dataType="octet"
            group="transportHeader"
            dataTypeSemantics="identifier"
            fieldId="33" applicability="all" status="current">
       <description>
         The type field of the IGMP message.
       </description>
       <reference>
         See RFC 2236 for a definition of the IGMP type field.
       </reference>
     </field>

     <field name="sourceMacAddress" dataType="macAddress"



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            group="subIpHeader"
            dataTypeSemantics="identifier"
            fieldId="56" applicability="data" status="current">
       <description>
         <paragraph>
           The IEEE 802 source MAC address field.
         </paragraph>
       </description>
       <reference>
         See IEEE.802-3.2002.
       </reference>
     </field>

     <field name="postSourceMacAddress" dataType="macAddress"
            group="subIpHeader"
            dataTypeSemantics="identifier"
            fieldId="81" applicability="data" status="current">
       <description>
         <paragraph>
         The definition of this Information Element is identical
         to the definition of Information Element
         'sourceMacAddress', except that it reports a
         potentially modified value caused by a middlebox
         function after the packet passed the observation point.
         </paragraph>
       </description>
       <reference>
         See IEEE.802-3.2002.
       </reference>
     </field>

     <field name="vlanId" dataType="unsigned16"
            group="subIpHeader"
            dataTypeSemantics="identifier"
            fieldId="58" applicability="data" status="current">
       <description>
         <paragraph>
           The IEEE 802.1Q VLAN identifier (VID) extracted from the Tag
           Control Information field that was attached to the IP packet.
         </paragraph>
       </description>
       <reference>
         See IEEE.802-1Q.2003.
       </reference>
     </field>

     <field name="postVlanId" dataType="unsigned16"
            group="subIpHeader"



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            dataTypeSemantics="identifier"
            fieldId="59" applicability="data" status="current">
       <description>
         <paragraph>
         The definition of this Information Element is identical
         to the definition of Information Element
         'vlanId', except that it reports a
         potentially modified value caused by a middlebox
         function after the packet passed the observation point.
         </paragraph>
       </description>
       <reference>
         See IEEE.802-1Q.2003.
       </reference>
     </field>

     <field name="destinationMacAddress" dataType="macAddress"
            group="subIpHeader"
            dataTypeSemantics="identifier"
            fieldId="80" applicability="data" status="current">
       <description>
         <paragraph>
           The IEEE 802 destination MAC address field.
         </paragraph>
       </description>
       <reference>
         See IEEE.802-3.2002.
       </reference>
     </field>

     <field name="postDestinationMacAddr" dataType="macAddress"
            group="subIpHeader"
            dataTypeSemantics="identifier"
            fieldId="57" applicability="data" status="current">
       <description>
         <paragraph>
         The definition of this Information Element is identical
         to the definition of Information Element
         'destinationMacAddress', except that it reports a
         potentially modified value caused by a middlebox
         function after the packet passed the observation point.
         </paragraph>
       </description>
       <reference>
         See IEEE.802-3.2002.
       </reference>
     </field>




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     <field name="wlanChannelId" dataType="octet"
            group="subIpHeader"
            dataTypeSemantics="identifier"
            fieldId="146" applicability="data" status="current">
       <description>
         <paragraph>
           The identifier of the 802.11 (Wi-Fi) channel used.
         </paragraph>
       </description>
       <reference>
         See IEEE.802-11.1999.
       </reference>
     </field>

     <field name="wlanSsid" dataType="string"
            group="subIpHeader"
            fieldId="147" applicability="data" status="current">
       <description>
         <paragraph>
           The Service Set IDentifier (SSID) identifying an 802.11
           (Wi-Fi) network used.  According to IEEE.802-11.1999 the
           SSID is encoded into a string of up to 32 characters.
         </paragraph>
       </description>
       <reference>
         See IEEE.802-11.1999.
       </reference>
     </field>

     <field name="mplsTopLabelTtl" dataType="unsigned32"
            group="subIpHeader"
            fieldId="200" applicability="all" status="current">
       <description>
         The TTL field from the top MPLS label stack entry,
         i.e. the last label that was pushed.
       </description>
       <reference>
         See RFC 3032 for the specification of the TTL field.
       </reference>
     </field>

     <field name="mplsTopLabelExp" dataType="octet"
            group="subIpHeader"
            dataTypeSemantics="flags"
            fieldId="203" applicability="all" status="current">
       <description>
         <paragraph>
         The Exp field from the top MPLS label stack entry,



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         i.e. the last label that was pushed.
         </paragraph>
         <artwork>
         Bit 0-4:  Don't Care, value is irrelevant.
         Bit 5-7:  MPLS Exp field

             0   1   2   3   4   5   6   7
           +---+---+---+---+---+---+---+---+
           |     don't care    |    Exp    |
           +---+---+---+---+---+---+---+---+
         </artwork>
       </description>
       <reference>
         See RFC 3032 for the specification of the Exp field.
         See RFC 3270 for usage of the Exp field.
       </reference>
     </field>

     <field name="mplsLabelStackDepth" dataType="unsigned32"
            group="subIpHeader"
            fieldId="202" applicability="all" status="current">
       <description>
         The number of labels in the MPLS label stack.
       </description>
       <reference>
         See RFC 3032 for the specification of the MPLS label
         stack.
       </reference>
       <units>label stack entries</units>
     </field>

     <field name="mplsLabelStackLength" dataType="unsigned32"
            group="subIpHeader"
            fieldId="201" applicability="all" status="current">
       <description>
         The length of the MPLS label stack in units of octets.
       </description>
       <reference>
         See RFC 3032 for the specification of the MPLS label
         stack.
       </reference>
       <units>octets</units>
     </field>

     <field name="mplsPayloadLength" dataType="unsigned32"
            group="subIpHeader"
            fieldId="214" applicability="all" status="current">
       <description>



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         The size of the MPLS packet without the label stack.
       </description>
       <reference>
         See RFC 3031 for the specification of MPLS packets.
         See RFC 3032 for the specification of the MPLS label
         stack.
       </reference>
       <units>octets</units>
     </field>

     <field name="mplsTopLabelStackEntry" dataType="unsigned32"
            group="subIpHeader"
            dataTypeSemantics="identifier"
            fieldId="70" applicability="all" status="current">
       <description>
         <paragraph>
         The label, exp and s fields from the top MPLS label
         stack entry, i.e. the last label that was pushed.
         </paragraph>
         <artwork>
       0                   1                   2
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                Label                  | Exp |S|
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

      Label:  Label Value, 20 bits
      Exp:    Experimental Use, 3 bits
      S:      Bottom of Stack, 1 bit
         </artwork>
       </description>
       <reference>
         See RFC 3032.
       </reference>
     </field>

     <field name="mplsLabelStackEntry2" dataType="unsigned32"
            group="subIpHeader"
            dataTypeSemantics="identifier"
            fieldId="71" applicability="all" status="current">
       <description>
         <paragraph>
         The label, exp, and s fields from the label stack entry that
         was pushed immediately before the label stack entry that would
         be reported by mplsTopLabelStackEntry. See the definition of
         mplsTopLabelStackEntry for further details.
         </paragraph>
       </description>



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       <reference>
         See RFC 3032.
       </reference>
     </field>

     <field name="mplsLabelStackEntry3" dataType="unsigned32"
            group="subIpHeader"
            dataTypeSemantics="identifier"
            fieldId="72" applicability="all" status="current">
       <description>
         <paragraph>
         The label, exp, and s fields from the label stack entry that
         was pushed immediately before the label stack entry that would
         be reported by mplsLabelStackEntry2. See the definition of
         mplsTopLabelStackEntry for further details.
         </paragraph>
       </description>
       <reference>
         See RFC 3032.
       </reference>
     </field>

     <field name="mplsLabelStackEntry4" dataType="unsigned32"
            group="subIpHeader"
            dataTypeSemantics="identifier"
            fieldId="73" applicability="all" status="current">
       <description>
         <paragraph>
         The label, exp, and s fields from the label stack entry that
         was pushed immediately before the label stack entry that would
         be reported by mplsLabelStackEntry3. See the definition of
         mplsTopLabelStackEntry for further details.
         </paragraph>
       </description>
       <reference>
         See RFC 3032.
       </reference>
     </field>

     <field name="mplsLabelStackEntry5" dataType="unsigned32"
            group="subIpHeader"
            dataTypeSemantics="identifier"
            fieldId="74" applicability="all" status="current">
       <description>
         <paragraph>
         The label, exp, and s fields from the label stack entry that
         was pushed immediately before the label stack entry that would
         be reported by mplsLabelStackEntry4. See the definition of



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         mplsTopLabelStackEntry for further details.
         </paragraph>
       </description>
       <reference>
         See RFC 3032.
       </reference>
     </field>

     <field name="mplsLabelStackEntry6" dataType="unsigned32"
            group="subIpHeader"
            dataTypeSemantics="identifier"
            fieldId="75" applicability="all" status="current">
       <description>
         <paragraph>
         The label, exp, and s fields from the label stack entry that
         was pushed immediately before the label stack entry that would
         be reported by mplsLabelStackEntry5. See the definition of
         mplsTopLabelStackEntry for further details.
         </paragraph>
       </description>
       <reference>
         See RFC 3032.
       </reference>
     </field>

     <field name="mplsLabelStackEntry7" dataType="unsigned32"
            group="subIpHeader"
            dataTypeSemantics="identifier"
            fieldId="76" applicability="all" status="current">
       <description>
         <paragraph>
         The label, exp, and s fields from the label stack entry that
         was pushed immediately before the label stack entry that would
         be reported by mplsLabelStackEntry6. See the definition of
         mplsTopLabelStackEntry for further details.
         </paragraph>
       </description>
       <reference>
         See RFC 3032.
       </reference>
     </field>

     <field name="mplsLabelStackEntry8" dataType="unsigned32"
            group="subIpHeader"
            dataTypeSemantics="identifier"
            fieldId="77" applicability="all" status="current">
       <description>
         <paragraph>



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         The label, exp, and s fields from the label stack entry that
         was pushed immediately before the label stack entry that would
         be reported by mplsLabelStackEntry7. See the definition of
         mplsTopLabelStackEntry for further details.
         </paragraph>
       </description>
       <reference>
         See RFC 3032.
       </reference>
     </field>

     <field name="mplsLabelStackEntry9" dataType="unsigned32"
            group="subIpHeader"
            dataTypeSemantics="identifier"
            fieldId="78" applicability="all" status="current">
       <description>
         <paragraph>
         The label, exp, and s fields from the label stack entry that
         was pushed immediately before the label stack entry that would
         be reported by mplsLabelStackEntry8. See the definition of
         mplsTopLabelStackEntry for further details.
         </paragraph>
       </description>
       <reference>
         See RFC 3032.
       </reference>
     </field>

     <field name="mplsLabelStackEntry10" dataType="unsigned32"
            group="subIpHeader"
            dataTypeSemantics="identifier"
            fieldId="79" applicability="all" status="current">
       <description>
         <paragraph>
         The label, exp, and s fields from the label stack entry that
         was pushed immediately before the label stack entry that would
         be reported by mplsLabelStackEntry9. See the definition of
         mplsTopLabelStackEntry for further details.
         </paragraph>
       </description>
       <reference>
         See RFC 3032.
       </reference>
     </field>

     <field name="ipNextHopIPv4Address" dataType="ipv4Address"
            group="derived"
            dataTypeSemantics="identifier"



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            fieldId="15" applicability="data" status="current">
       <description>
         <paragraph>
         The IPv4 address of the next IPv4 hop.
         </paragraph>
       </description>
     </field>

     <field name="ipNextHopIPv6Address" dataType="ipv6Address"
            group="derived"
            dataTypeSemantics="identifier"
            fieldId="62" applicability="data" status="current">
       <description>
         <paragraph>
         The IPv6 address of the next IPv6 hop.
         </paragraph>
       </description>
     </field>

   <!--
     <field name="ipNextHopAsNumber" dataType="unsigned16"
            group="derived"
            dataTypeSemantics="identifier"
            fieldId="162" applicability="all" status="current">
       <description>
         <paragraph>
         The autonomous system (AS) number of the next IP hop.
         </paragraph>
       </description>
       <reference>
         See RFC 1771 for a description of BGP-4 and
         see RFC 1930 for a definition of the AS number.
       </reference>
     </field>
   -->

     <field name="bgpSourceAsNumber" dataType="unsigned16"
            group="derived"
            dataTypeSemantics="identifier"
            fieldId="16" applicability="all" status="current">
       <description>
         <paragraph>
         The autonomous system (AS) number of the source IP address.
         If AS path information for this Flow is only available as
         unordered AS set (and not as ordered AS sequence),
         then the value of this Information Element is 0.
         </paragraph>
       </description>



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       <reference>
         See RFC 1771 for a description of BGP-4 and
         see RFC 1930 for a definition of the AS number.
       </reference>
     </field>

     <field name="bgpDestinationAsNumber" dataType="unsigned16"
            group="derived"
            dataTypeSemantics="identifier"
            fieldId="17" applicability="all" status="current">
       <description>
         <paragraph>
         The autonomous system (AS) number of the destination IP
         address.  If AS path information for this Flow is only
         available as unordered AS set (and not as ordered AS
         sequence), then the value of this Information Element is 0.
         </paragraph>
       </description>
       <reference>
         See RFC 1771 for a description of BGP-4 and
         see RFC 1930 for a definition of the AS number.
       </reference>
     </field>

     <field name="bgpNextAdjacentAsNumber" dataType="unsigned16"
            group="derived"
            dataTypeSemantics="identifier"
            fieldId="128" applicability="all" status="current">
       <description>
         <paragraph>
         The autonomous system (AS) number of the first AS in the AS
         path to the destination IP address.  The path is deduced
         by looking up the destination IP address of the Flow in the
         BGP routing information base.  If AS path information for
         this Flow is only available as unordered AS set (and not as
         ordered AS sequence),
         then the value of this Information Element is 0.
         </paragraph>
       </description>
       <reference>
         See RFC 1771 for a description of BGP-4 and
         see RFC 1930 for a definition of the AS number.
       </reference>
     </field>

     <field name="bgpPrevAdjacentAsNumber" dataType="unsigned16"
            group="derived"
            dataTypeSemantics="identifier"



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            fieldId="129" applicability="all" status="current">
       <description>
         <paragraph>
         The autonomous system (AS) number of the last AS in the AS
         path from the source IP address.  The path is deduced
         by looking up the source IP address of the Flow in the BGP
         routing information base.  If AS path information for this
         Flow is only available as unordered AS set (and not as
         ordered AS sequence), then the value of this Information
         Element is 0.  In case of BGP asymmetry, the
         bgpPrevAdjacentAsNumber might not be
         able to report the correct value.
         </paragraph>
       </description>
       <reference>
         See RFC 1771 for a description of BGP-4 and
         see RFC 1930 for a definition of the AS number.
       </reference>
     </field>

     <field name="bgpNextHopIPv4Address" dataType="ipv4Address"
            group="derived"
            dataTypeSemantics="identifier"
            fieldId="18" applicability="all" status="current">
       <description>
         <paragraph>
         The IPv4 address of the next (adjacent) BGP hop.
         </paragraph>
       </description>
       <reference>
         See RFC 1771 for a description of BGP-4 and
       </reference>
     </field>

     <field name="bgpNextHopIPv6Address" dataType="ipv6Address"
            group="derived"
            dataTypeSemantics="identifier"
            fieldId="63" applicability="all" status="current">
       <description>
         <paragraph>
         The IPv6 address of the next (adjacent) BGP hop.
         </paragraph>
       </description>
       <reference>
         See RFC 1771 for a description of BGP-4.
       </reference>
     </field>




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     <field name="mplsTopLabelType" dataType="octet"
            group="derived"
            dataTypeSemantics="identifier"
            fieldId="46" applicability="data" status="current">
       <description>
         <paragraph>
         This field identifies the control protocol that allocated the
         top of stack label.  Defined values for this field include:
         <artwork>
        - 0x01 TE-MIDPT: Any TE tunnel mid-point or tail label
        - 0x02 Pseudowire: Any PWE3 or Cisco AToM based label
        - 0x03 VPN: Any label associated with VPN
        - 0x04 BGP: Any label associated with BGP or BGP routing
        - 0x05 LDP: Any label associated with dynamically assigned
                    labels using LDP
         </artwork>
         </paragraph>
       </description>
       <reference>
         See RFC 3031 for the MPLS label structure.
         See RFC 2547 for the association of MPLS labels with VPNs.
         See RFC 1771 for BGP and BGP routing.
         See RFC 3036 for LDP.
         and IP addresses.
       </reference>
     </field>

     <field name="mplsTopLabelIPv4Address" dataType="ipv4Address"
            group="derived"
            dataTypeSemantics="identifier"
            fieldId="47" applicability="data" status="current">
       <description>
         <paragraph>
           The IPv4 address of the system that the MPLS top label will
           cause this Flow to be forwarded to.
         </paragraph>
       </description>
       <reference>
         See RFC 3031 for the association between MPLS labels
         and IP addresses.
       </reference>
     </field>

     <field name="mplsTopLabelIPv6Address" dataType="ipv6Address"
            group="derived"
            dataTypeSemantics="identifier"
            fieldId="140" applicability="data" status="current">
       <description>



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         <paragraph>
           The IPv6 address of the system that the MPLS top label will
           cause this Flow to be forwarded to.
         </paragraph>
       </description>
       <reference>
         See RFC 3031 for the association between MPLS labels
         and IP addresses.
       </reference>
     </field>

     <field name="exporterIPv4Address" dataType="ipv4Address"
            dataTypeSemantics="identifier"
            group="config"
            fieldId="130" applicability="all" status="current">
       <description>
         <paragraph>
         The IPv4 address used by the Exporting Process.  This is used
         by the Collector to identify the Exporter in cases where the
         identity of the Exporter may have been obscured by the use of
         a proxy.
         </paragraph>
       </description>
     </field>

     <field name="exporterIPv6Address" dataType="ipv6Address"
            dataTypeSemantics="identifier"
            group="config"
            fieldId="131" applicability="all" status="current">
       <description>
         <paragraph>
         The IPv6 address used by the Exporting Process.  This is used
         by the Collector to identify the Exporter in cases where the
         identity of the Exporter may have been obscured by the use of
         a proxy.
         </paragraph>
       </description>
     </field>

     <field name="minimumPacketLength" dataType="unsigned16"
            group="minMax"
            fieldId="25" applicability="all" status="current">
       <description>
         <paragraph>
         Length of the smallest packet observed for this Flow.
         </paragraph>
       </description>
       <units>octets</units>



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     </field>

     <field name="maximumPacketLength" dataType="unsigned16"
            group="minMax"
            fieldId="26" applicability="all" status="current">
       <description>
         <paragraph>
         Length of the largest packet observed for this Flow.
         </paragraph>
       </description>
       <units>octets</units>
     </field>

     <field name="minimumTtl" dataType="octet"
            group="minMax"
            fieldId="52" applicability="data" status="current">
       <description>
         <paragraph>
           Minimum TTL value observed for any packet in this Flow.
         </paragraph>
       </description>
     </field>

     <field name="maximumTtl" dataType="octet"
            group="minMax"
            fieldId="53" applicability="data" status="current">
       <description>
         <paragraph>
           Maximum TTL value observed for any packet in this Flow.
         </paragraph>
       </description>
     </field>

     <field name="ipv4Options" dataType="unsigned32"
            dataTypeSemantics="flags"
            group="minMax"
            fieldId="208" applicability="all" status="current">
       <description>
         <paragraph>
         IPv4 options in packets of this Flow.
         The information is encoded in a set of bit fields.  For
         each valid IPv4 option type there is a bit in this set.
         The bit is set to 1 if any observed packet of this Flow
         contains the corresponding IPv4 option type.  Otherwise,
         if no observed packet of this Flow contained the
         respective IPv4 option type, the value of the
         corresponding bit is 0.
         </paragraph>



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         <paragraph>
         The list of valid IPv4 options is maintained by IANA.
         Note that for identifying an option not just the 5-bit
         Option Number, but all 8 bits of the Option Type need to
         match one of the IPv4 options specified at
         http://www.iana.org/assignments/ip-parameters.
         </paragraph>
         <paragraph>
         Options are mapped to bits according to their option numbers.
         Option number X is mapped to bit X.
         The mapping is illustrated by the figure below.
         </paragraph>
         <artwork>
           0      1      2      3      4      5      6      7
       +------+------+------+------+------+------+------+------+
       | EOOL | NOP  | SEC  | LSR  |  TS  |E-SEC |CIPSO |  RR  | ...
       +------+------+------+------+------+------+------+------+

           8      9     10     11     12     13     14     15
       +------+------+------+------+------+------+------+------+
   ... | SID  | SSR  | ZSU  | MTUP | MTUR | FINN | VISA |ENCODE| ...
       +------+------+------+------+------+------+------+------+

          16     17     18     19     20     21     22     23
       +------+------+------+------+------+------+------+------+
   ... |IMITD | EIP  |  TR  |ADDEXT|RTRALT| SDB  |NSAPA | DPS  | ...
       +------+------+------+------+------+------+------+------+

          24     25     26     27     28     29     30     31
       +------+------+------+------+------+------+------+------+
   ... | UMP  |             to be assigned by IANA             |
       +------+------+------+------+------+------+------+------+


           Type   Option
       Bit Value  Name    Reference
       ---+-----+-------+------------------------------------
        0     0   EOOL    End of Options List, RFC 791
        1     1   NOP     No Operation, RFC 791
        2   130   SEC     Security, RFC 1108
        3   131   LSR     Loose Source Route, RFC 791
        4    68   TS      Time Stamp, RFC 791
        5   133   E-SEC   Extended Security, RFC 1108
        6   134   CIPSO   Commercial Security
        7     7   RR      Record Route, RFC 791
        8   136   SID     Stream ID, RFC 791
        9   137   SSR     Strict Source Route, RFC 791
       10    10   ZSU     Experimental Measurement



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       11    11   MTUP    (obsoleted) MTU Probe, RFC 1191
       12    12   MTUR    (obsoleted) MTU Reply, RFC 1191
       13   205   FINN    Experimental Flow Control
       14   142   VISA    Experimental Access Control
       15    15   ENDOCE
       16   144   IMITD   IMI Traffic Descriptor
       17   145   EIP     Extended Internet Protocol, RFC 1385
       18    82   TR      Traceroute, RFC 3193
       19   147   ADDEXT  Address Extension
       20   148   RTRALT  Router Alert, RFC 2113
       21   149   SDB     Selective Directed Broadcast
       22   150   NSAPA   NSAP Address
       23   151   DPS     Dynamic Packet State
       24   152   UMP     Upstream Multicast Pkt.
       ...  ...   ...     Further options numbers
                          may be assigned by IANA
         </artwork>
       </description>
       <reference>
         See RFC 791 for the definition of IPv4 options.
         See the list of IPv4 option numbers assigned by IANA
         at http://www.iana.org/assignments/ip-parameters.
       </reference>
     </field>

     <field name="ipv6ExtensionHeaders" dataType="unsigned32"
            dataTypeSemantics="flags"
            group="minMax"
            fieldId="64" applicability="all" status="current">
       <description>
         <paragraph>
        IPv6 extension headers observed in packets of this Flow.
        The information is encoded in a set of bit fields.  For
        each IPv6 option header there is a bit in this set.
        The bit is set to 1 if any observed packet of this Flow
        contains the corresponding IPv6 extension header.
        Otherwise, if no observed packet of this Flow contained
        the respective IPv6 extension header, the value of the
        corresponding bit is 0.
         </paragraph>
         <artwork>
              0     1     2     3     4     5     6     7
          +-----+-----+-----+-----+-----+-----+-----+-----+
          | Res | FRA1| ROU | FRA0| UNK | Res | HOP | DST |  ...
          +-----+-----+-----+-----+-----+-----+-----+-----+

              8     9    10    11    12    13    14    15
          +-----+-----+-----+-----+-----+-----+-----+-----+



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      ... | PAY | AUT | ENC |         Reserved            | ...
          +-----+-----+-----+-----+-----+-----+-----+-----+

             16    17    18    19    20    21    22    23
          +-----+-----+-----+-----+-----+-----+-----+-----+
      ... |                  Reserved                     | ...
          +-----+-----+-----+-----+-----+-----+-----+-----+

             24    25    26    27    28    29    30    31
          +-----+-----+-----+-----+-----+-----+-----+-----+
      ... |                  Reserved                     |
          +-----+-----+-----+-----+-----+-----+-----+-----+

        Bit    IPv6 Option   Description

       0, Res               Reserved
       1, FRA1     44       Fragmentation header - not first fragment
       2, ROU      43       Routing header
       3, FRA0     44       Fragment header - first fragment
       4, UNK               Unknown Layer 4 header
                            (compressed, encrypted, not supported)
       5, Res               Reserved
       6, HOP       0       Hop-by-hop option header
       7, DST      60       Destination option header
       8, PAY     108       Payload compression header
       9, AUT      51       Authentication Header
      10, ENC      50       Encrypted security payload
      11 to 31              Reserved
         </artwork>
       </description>
       <reference>
        See RFC 2460 for the general definition of IPv6 extensions
        headers and for the specification of the hop-by-hop options
        header, the routing header, the fragment header, and the
        destination options header.
        See RFC 2402 for the specification of the authentication
        header.
        See RFC 2406 for the specification of the encapsulating
        security payload.
       </reference>
     </field>

     <field name="tcpControlBits" dataType="octet"
            dataTypeSemantics="flags"
            group="minMax"
            fieldId="6" applicability="all" status="current">
       <description>
         <paragraph>



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         TCP control bits observed for packets of this Flow.
         The information is encoded in a set of bit fields.
         For each TCP control bit there is a bit in this
         set.  A bit is set to 1 if any observed packet of this
         Flow has the corresponding TCP control bit set to 1.
         A value of 0 for a bit indicates that the corresponding
         bit was not set in any of the observed packets
         of this Flow.
         </paragraph>
         <artwork>
          0     1     2     3     4     5     6     7
      +-----+-----+-----+-----+-----+-----+-----+-----+
      |  Reserved | URG | ACK | PSH | RST | SYN | FIN |
      +-----+-----+-----+-----+-----+-----+-----+-----+

      Reserved:  Reserved for future use by TCP.  Must be zero.
           URG:  Urgent Pointer field significant
           ACK:  Acknowledgment field significant
           PSH:  Push Function
           RST:  Reset the connection
           SYN:  Synchronize sequence numbers
           FIN:  No more data from sender
         </artwork>
       </description>
       <reference>See RFC 793 for a definition of the TCP control bits
       in the TCP header.</reference>
     </field>

     <field name="tcpOptions" dataType="unsigned64"
            dataTypeSemantics="flags"
            group="minMax"
            fieldId="209" applicability="all" status="current">
       <description>
         <paragraph>
        TCP options in packets of this Flow.
        The information is encoded in a set of bit fields.  For
        each TCP option there is a bit in this set.
        The bit is set to 1 if any observed packet of this Flow
        contains the corresponding TCP option.
        Otherwise, if no observed packet of this Flow contained
        the respective TCP option, the value of the
        corresponding bit is 0.
         </paragraph>
         <paragraph>
         Options are mapped to bits according to their option
         numbers.  Option number X is mapped to bit X.
         TCP option numbers are maintained by IANA.
         </paragraph>



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       </description>
       <reference>
         See RFC 793 for the definition of TCP options.
         See the list of TCP option numbers assigned by IANA
         at http://www.iana.org/assignments/tcp-parameters.
       </reference>
     </field>

     <field name="flowStartSeconds" dataType="dateTimeSeconds"
            group="timestamp"
            fieldId="150" applicability="data" status="current">
       <description>
         The absolute timestamp of the first packet of this Flow.
       </description>
       <units>seconds</units>
     </field>

     <field name="flowEndSeconds" dataType="dateTimeSeconds"
            group="timestamp"
            fieldId="151" applicability="data" status="current">
       <description>
         The absolute timestamp of the last packet of this Flow.
       </description>
       <units>seconds</units>
     </field>

     <field name="flowStartMilliSeconds" dataType="dateTimeMilliSeconds"
            group="timestamp"
            fieldId="152" applicability="data" status="current">
       <description>
         The absolute timestamp of the first packet of this Flow.
       </description>
       <units>milliseconds</units>
     </field>

     <field name="flowEndMilliSeconds" dataType="dateTimeMilliSeconds"
            group="timestamp"
            fieldId="153" applicability="data" status="current">
       <description>
         The absolute timestamp of the last packet of this Flow.
       </description>
       <units>milliseconds</units>
     </field>

     <field name="flowStartMicroSeconds" dataType="dateTimeMicroSeconds"
            group="timestamp"
            fieldId="154" applicability="data" status="current">
       <description>



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         The absolute timestamp of the first packet of this Flow.
       </description>
       <units>microseconds</units>
     </field>

     <field name="flowEndMicroSeconds" dataType="dateTimeMicroSeconds"
            group="timestamp"
            fieldId="155" applicability="data" status="current">
       <description>
         The absolute timestamp of the last packet of this Flow.
       </description>
       <units>microseconds</units>
     </field>

     <field name="flowStartNanoSeconds" dataType="dateTimeNanoSeconds"
            group="timestamp"
            fieldId="156" applicability="data" status="current">
       <description>
         The absolute timestamp of the first packet of this Flow.
       </description>
       <units>nanoseconds</units>
     </field>

     <field name="flowEndNanoSeconds" dataType="dateTimeNanoSeconds"
            group="timestamp"
            fieldId="157" applicability="data" status="current">
       <description>
         The absolute timestamp of the last packet of this Flow.
       </description>
       <units>nanoseconds</units>
     </field>

     <field name="flowStartDeltaMicroSeconds" dataType="unsigned32"
            group="timestamp"
            fieldId="158" applicability="data" status="current">
       <description>
         This is a relative time stamp only valid within the scope
         of a single IPFIX Message.  It contains the negative time
         offset of the first observed packet of this Flow relative
         to the export time specified in the IPFIX Message header.
       </description>
       <reference>
         See [I-D.ietf-ipfix-protocol] for the definition of the IPFIX
         Message header.
       </reference>
       <units>microseconds</units>
     </field>




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     <field name="flowEndDeltaMicroSeconds" dataType="unsigned32"
            group="timestamp"
            fieldId="159" applicability="data" status="current">
       <description>
         This is a relative time stamp only valid within the scope
         of a single IPFIX Message.  It contains the negative time
         offset of the last observed packet of this Flow relative
         to the export time specified in the IPFIX Message header.
       </description>
       <reference>
         See [I-D.ietf-ipfix-protocol] for the definition of the IPFIX
         Message header.
       </reference>
       <units>microseconds</units>
     </field>

     <field name="systemInitTimeMilliSeconds"
            dataType="dateTimeMilliSeconds"
            group="timestamp"
            fieldId="160" applicability="data" status="current">
       <description>
         The absolute timestamp of the last (re-)initialization of the
         IPFIX Device.
       </description>
       <units>milliseconds</units>
     </field>

     <field name="flowStartSysUpTime" dataType="unsigned32"
            group="timestamp"
            fieldId="22" applicability="data" status="current">
       <description>
         The relative timestamp of the first packet of this Flow.
         It indicates the number of milliseconds since the
         last (re-)initialization of the IPFIX Device (sysUpTime).
       </description>
       <units>milliseconds</units>
     </field>

     <field name="flowEndSysUpTime" dataType="unsigned32"
            group="timestamp"
            fieldId="21" applicability="data" status="current">
       <description>
         The relative timestamp of the last packet of this Flow.
         It indicates the number of milliseconds since the
         last (re-)initialization of the IPFIX Device (sysUpTime).
       </description>
       <units>milliseconds</units>
     </field>



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     <field name="flowActiveTimeOut" dataType="unsigned16"
            group="misc"
            fieldId="36" applicability="all" status="current">
       <description>
         <paragraph>
         The number of seconds after which an active Flow is timed out
         anyway, even if there is still a continuous flow of packets.
         </paragraph>
       </description>
       <units>seconds</units>
     </field>

     <field name="flowInactiveTimeout" dataType="unsigned16"
            group="misc"
            fieldId="37" applicability="all" status="current">
       <description>
         <paragraph>
          A Flow is considered to be timed out if no packets belonging
          to the Flow have been observed for the number of seconds
          specified by this field.
         </paragraph>
       </description>
       <units>seconds</units>
     </field>

     <field name="flowEndReason" dataType="octet"
            group="misc"
            dataTypeSemantics="identifier"
            fieldId="136" applicability="data" status="current">
       <description>
         <paragraph>
         The reason for Flow termination. The range of values includes
         <artwork>
      0x01: idle timeout
            The flow was terminated because it was considered to be
            idle.
      0x02: active timeout
            The flow was terminated for reporting purposes while it was
            still active, for example, after the maximum lifetime of
            unreported flows was reached.
      0x03: end of Flow detected
            The flow was terminated because the Metering Process
            detected signals indicating the end of the flow,
            for example, the TCP FIN flag.
      0x04: forced end
            The flow was terminated because of some external event,
            for example, a shut down of the Metering Process initiated
            by a network management application.



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      0x05: cache full
            the flow was terminated because of lack of resources
            available to the Metering Process and/or the Exporting
            Process
         </artwork>
         </paragraph>
       </description>
     </field>

     <field name="flowDurationMilliSeconds" dataType="unsigned32"
            group="misc"
            fieldId="161" applicability="data" status="current">
       <description>
         The difference between in time between the observation of the
         first packet of this Flow and the observation of the last
         packet of this Flow.
       </description>
       <units>milliseconds</units>
     </field>

     <field name="flowDurationMicroSeconds" dataType="unsigned32"
            group="misc"
            fieldId="162" applicability="data" status="current">
       <description>
         The difference between in time between the observation of the
         first packet of this Flow and the observation of the last
         packet of this Flow.
       </description>
       <units>microseconds</units>
     </field>

     <field name="octetDeltaCount" dataType="unsigned64"
            dataTypeSemantics="deltaCounter"
            group="flowCounter"
            fieldId="1" applicability="data" status="current">
       <description>
         <paragraph>
         The number of octets since the previous report (if any)
         in incoming packets for this Flow at the Observation Point.
         The number of octets include IP header(s) and IP payload.
         </paragraph>
       </description>
       <units>octets</units>
     </field>

     <field name="postOctetDeltaCount" dataType="unsigned64"
            dataTypeSemantics="deltaCounter"
            group="flowCounter"



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            fieldId="23" applicability="data" status="current">
       <description>
         <paragraph>
         The definition of this Information Element is identical
         to the definition of Information Element
         'octetDeltaCount', except that it reports a
         potentially modified value caused by a middlebox
         function after the packet passed the observation point.
         </paragraph>
       </description>
       <units>octets</units>
     </field>

     <field name="octetDeltaSumOfSquares" dataType="unsigned64"
            group="flowCounter"
            fieldId="198" applicability="data" status="current">
       <description>
         <paragraph>
         The sum of the squared numbers of octets per incoming
         packet since the previous report (if any) for this
         Flow at the Observation Point.
         The number of octets include IP header(s) and IP payload.
         </paragraph>
       </description>
     </field>

     <field name="octetTotalCount" dataType="unsigned64"
            dataTypeSemantics="totalCounter"
            group="flowCounter"
            fieldId="85" applicability="all" status="current">
       <description>
         <paragraph>
         The total number of octets in incoming packets
         for this Flow at the Observation Point since the Metering
         Process (re-)initialization for this Observation Point. The
         number of octets include IP header(s) and IP payload.
         </paragraph>
       </description>
       <units>octets</units>
     </field>

     <field name="postOctetTotalCount" dataType="unsigned64"
            dataTypeSemantics="totalCounter"
            group="flowCounter"
            fieldId="171" applicability="all" status="current">
       <description>
         <paragraph>
         The definition of this Information Element is identical



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         to the definition of Information Element
         'octetTotalCount', except that it reports a
         potentially modified value caused by a middlebox
         function after the packet passed the observation point.
         </paragraph>
       </description>
       <units>octets</units>
     </field>

     <field name="octetTotalSumOfSquares" dataType="unsigned64"
            group="flowCounter"
            fieldId="199" applicability="all" status="current">
       <description>
         <paragraph>
         The total sum of the squared numbers of octets in incoming
         packets for this Flow at the Observation Point since the
         Metering Process (re-)initialization for this Observation
         Point. The number of octets include IP header(s) and IP
         payload.
         </paragraph>
       </description>
       <units>octets</units>
     </field>

     <field name="packetDeltaCount" dataType="unsigned64"
            dataTypeSemantics="deltaCounter"
            group="flowCounter"
            fieldId="2" applicability="data" status="current">
       <description>
         <paragraph>
         The number of incoming packets since the previous report
         (if any) for this Flow at the Observation Point.
         </paragraph>
       </description>
       <units>packets</units>
     </field>

     <field name="postPacketDeltaCount" dataType="unsigned64"
            dataTypeSemantics="deltaCounter"
            group="flowCounter"
            fieldId="24" applicability="data" status="current">
       <description>
         <paragraph>
         The definition of this Information Element is identical
         to the definition of Information Element
         'packetDeltaCount', except that it reports a
         potentially modified value caused by a middlebox
         function after the packet passed the observation point.



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         </paragraph>
       </description>
       <units>packets</units>
     </field>

     <field name="packetTotalCount" dataType="unsigned64"
            dataTypeSemantics="totalCounter"
            group="flowCounter"
            fieldId="86" applicability="all" status="current">
       <description>
         <paragraph>
         The total number of incoming packets for this Flow
         at the Observation Point since the Metering Process
         (re-)initialization for this Observation Point.
         </paragraph>
       </description>
       <units>packets</units>
     </field>

     <field name="postPacketTotalCount" dataType="unsigned64"
            dataTypeSemantics="totalCounter"
            group="flowCounter"
            fieldId="172" applicability="all" status="current">
       <description>
         <paragraph>
         The definition of this Information Element is identical
         to the definition of Information Element
         'packetTotalCount', except that it reports a
         potentially modified value caused by a middlebox
         function after the packet passed the observation point.
         </paragraph>
       </description>
       <units>packets</units>
     </field>

     <field name="droppedOctetDeltaCount" dataType="unsigned64"
            dataTypeSemantics="deltaCounter"
            group="flowCounter"
            fieldId="132" applicability="data" status="current">
       <description>
         <paragraph>
         The number of octets since the previous report (if any)
         in packets of this Flow dropped by packet treatment.
         The number of octets include IP header(s) and IP payload.
         </paragraph>
       </description>
       <units>octets</units>
     </field>



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     <field name="droppedPacketDeltaCount" dataType="unsigned64"
            dataTypeSemantics="deltaCounter"
            group="flowCounter"
            fieldId="133" applicability="data" status="current">
       <description>
         <paragraph>
         The number of packets since the previous report (if any)
         of this Flow dropped by packet treatment.
         </paragraph>
       </description>
       <units>packets</units>
     </field>

     <field name="droppedOctetTotalCount" dataType="unsigned64"
            dataTypeSemantics="totalCounter"
            group="flowCounter"
            fieldId="134" applicability="data" status="current">
       <description>
         <paragraph>
         The total number of octets in packets of this Flow dropped
         by packet treatment since the Metering Process
         (re-)initialization for this Observation Point.
         The number of octets include IP header(s) and IP payload.
         </paragraph>
       </description>
       <units>octets</units>
     </field>

     <field name="droppedPacketTotalCount" dataType="unsigned64"
            dataTypeSemantics="totalCounter"
            group="flowCounter"
            fieldId="135" applicability="data" status="current">
       <description>
         <paragraph>
         The number of packets of this Flow dropped by packet
         treatment since the Metering Process
         (re-)initialization for this Observation Point.
         </paragraph>
       </description>
       <units>packets</units>
     </field>

     <field name="postMCastPacketDeltaCount" dataType="unsigned64"
            dataTypeSemantics="deltaCounter"
            group="flowCounter"
            fieldId="19" applicability="data" status="current">
       <description>
         <paragraph>



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         The number of outgoing multicast packets since the
         previous report (if any) sent for packets of this Flow
         by a multicast daemon within the Observation Domain.
         This property cannot necessarily be observed at the
         Observation Point, but may be retrieved by other means.
         </paragraph>
       </description>
       <units>packets</units>
     </field>

     <field name="postMCastOctetDeltaCount" dataType="unsigned64"
            dataTypeSemantics="deltaCounter"
            group="flowCounter"
            fieldId="20" applicability="data" status="current">
       <description>
         <paragraph>
         The number of octets since the previous report (if any)
         in outgoing multicast packets sent for packets of this
         Flow by a multicast daemon within the Observation Domain.
         This property cannot necessarily be observed at the
         Observation Point, but may be retrieved by other means.
         The number of octets include IP header(s) and IP payload.
         </paragraph>
       </description>
       <units>octets</units>
     </field>

     <field name="postMCastPacketTotalCount" dataType="unsigned64"
            dataTypeSemantics="totalCounter"
            group="flowCounter"
            fieldId="174" applicability="data" status="current">
       <description>
         <paragraph>
         The total number of outgoing multicast packets sent for
         packets of this Flow by a multicast daemon within the
         Observation Domain since the Metering Process
         (re-)initialization.  This property cannot necessarily
         be observed at the Observation Point, but may be retrieved
         by other means.
         </paragraph>
       </description>
       <units>packets</units>
     </field>

     <field name="postMCastOctetTotalCount" dataType="unsigned64"
            dataTypeSemantics="totalCounter"
            group="flowCounter"
            fieldId="175" applicability="data" status="current">



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       <description>
         <paragraph>
         The total number of octets in outgoing multicast packets
         sent for packets of this Flow by a multicast daemon in the
         Observation Domain since the Metering Process
         (re-)initialization.  This property cannot necessarily be
         observed at the Observation Point, but may be retrieved by
         other means.
         The number of octets include IP header(s) and IP payload.
         </paragraph>
       </description>
       <units>octets</units>
     </field>

     <field name="exportedMessageTotalCount" dataType="unsigned64"
            dataTypeSemantics="totalCounter"
            group="processCounter"
            fieldId="41" applicability="data" status="current">
       <description>
         <paragraph>
         The total number of IPFIX Messages that the Exporting Process
         successfully sent since the Exporting Process
         (re-)initialization to the Collecting Process receiving a
         report that contains this Information Element.
         </paragraph>
       </description>
       <units>messages</units>
     </field>

     <field name="exportedOctetTotalCount" dataType="unsigned64"
            dataTypeSemantics="totalCounter"
            group="processCounter"
            fieldId="40" applicability="data" status="current">
       <description>
         <paragraph>
            The total number of octets that the Exporting Process
            successfully sent since the Exporting Process
            (re-)initialization to the Collecting Process receiving a
            report that contains this Information Element.  The value
            of this Information Element is calculated by summing up
            the IPFIX Message header length values of all IPFIX Messages
            that were successfully sent to the Collecting Process
            receiving a report that contains this Information Element.
         </paragraph>
       </description>
       <units>octets</units>
     </field>




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     <field name="exportedFlowTotalCount" dataType="unsigned64"
            group="processCounter"
            dataTypeSemantics="totalCounter"
            fieldId="42" applicability="data" status="current">
       <description>
         <paragraph>
         The total number of Flows Records that the Exporting
         Process successfully sent as Data Records since the Exporting
         Process (re-)initialization to the Collecting Process receiving
         a report that contains this Information Element.
         </paragraph>
       </description>
       <units>Flows</units>
     </field>

     <field name="observedFlowTotalCount" dataType="unsigned64"
            dataTypeSemantics="totalCounter"
            group="processCounter"
            fieldId="163" applicability="data" status="current">
       <description>
         <paragraph>
         The total number of Flows observed in the Observation Domain
         since the Metering Process (re-)initialization for this
         Observation Point.
         </paragraph>
       </description>
       <units>Flows</units>
     </field>

     <field name="ignoredPacketTotalCount" dataType="unsigned64"
            dataTypeSemantics="totalCounter"
            group="processCounter"
            fieldId="164" applicability="data" status="current">
       <description>
         <paragraph>
            The total number of observed IP packets that the
            Metering Process did not process since the
            (re-)initialization of the Metering Process.
         </paragraph>
       </description>
       <units>packets</units>
     </field>

     <field name="ignoredOctetTotalCount" dataType="unsigned64"
            dataTypeSemantics="totalCounter"
            group="processCounter"
            fieldId="165" applicability="data" status="current">
       <description>



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         <paragraph>
            The total number of octets in observed IP packets
            that the Metering Process did not process since the
            (re-)initialization of the Metering Process.
         </paragraph>
       </description>
       <units>octets</units>
     </field>

     <field name="notSentFlowTotalCount" dataType="unsigned64"
            dataTypeSemantics="totalCounter"
            group="processCounter"
            fieldId="166" applicability="data" status="current">
       <description>
         <paragraph>
            The total number of Flow Records that were generated by the
            Metering Process and but dropped by the Metering Process or
            by the Exporting Process
            instead of sending it to the Collecting Process.
            There are several potential reasons for this including
            resource shortage and special Flow export policies.
         </paragraph>
       </description>
       <units>Flows</units>
     </field>

     <field name="notSentPacketTotalCount" dataType="unsigned64"
            dataTypeSemantics="totalCounter"
            group="processCounter"
            fieldId="167" applicability="data" status="current">
       <description>
         <paragraph>
            The total number of packets in Flow Records that were
            generated by the Metering Process and but dropped
            by the Metering Process or by the Exporting Process
            instead of sending it to the Collecting Process.
            There are several potential reasons for this including
            resource shortage and special Flow export policies.
         </paragraph>
       </description>
       <units>packets</units>
     </field>

     <field name="notSentOctetTotalCount" dataType="unsigned64"
            dataTypeSemantics="totalCounter"
            group="processCounter"
            fieldId="168" applicability="data" status="current">
       <description>



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         <paragraph>
            The total number of octets in packets in Flow Records
            that were generated by the Metering Process and but
            dropped by the Metering Process or by the Exporting
            Process instead of sending it to the Collecting Process.
            There are several potential reasons for this including
            resource shortage and special Flow export policies.
         </paragraph>
       </description>
       <units>octets</units>
     </field>

     <field name="flowKeyIndicator" dataType="unsigned64"
            dataTypeSemantics="flags"
            group="processCounter"
            fieldId="173" applicability="all" status="current">
       <description>
         <paragraph>
         This set of bit fields is used for marking the Information
         Elements of a Data Record that serve as Flow Key.  Each bit
         represents an Information Element in the Data Record with
         the n-th bit representing the n-th Information Element.
         A set bit with value 1 indicates that the corresponding
         Information element is a Flow Key of the reported Flow.
         A value of 0 indicates that this is not the case.  If the
         Data Record contains more than 64 Information Elements, the
         corresponding Template SHOULD be designed such that all Flow
         Keys are among the first 64 Information Elements, because the
         flowKeyIndicator only contains 64 bits.  If the Data Record
         contains less than 64 Information Elements, then the bits in
         the flowKeyIndicator for which no corresponding Information
         Element exists SHOULD have the value 0.
         </paragraph>
       </description>
     </field>

     <field name="lineCardId" dataType="unsigned32"
            group="scope"
            dataTypeSemantics="identifier"
            fieldId="141" applicability="option" status="current">
       <description>
         <paragraph>
           A locally unique identifier of a line card at an IPFIX
           Device hosting an Observation Point.  Typically, this
           Information Element is used for limiting the scope
           of other Information Elements.
         </paragraph>
       </description>



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     </field>

     <field name="portId" dataType="unsigned32"
            group="scope"
            dataTypeSemantics="identifier"
            fieldId="142" applicability="option" status="current">
       <description>
         <paragraph>
           A locally unique identifier of a line port at an IPFIX
           Device hosting an Observation Point.  Typically, this
           Information Element is used for limiting the scope
           of other Information Elements.
         </paragraph>
       </description>
     </field>

     <field name="ingressInterface" dataType="unsigned32"
            group="scope"
            dataTypeSemantics="identifier"
            fieldId="10" applicability="all" status="current">
       <description>
         <paragraph>
           The index of the IP interface (ifIndex) where packets of
           this Flow are being received.
         </paragraph>
       </description>
       <reference>
         See RFC 2863 for the definition of the ifIndex object.
       </reference>
     </field>

     <field name="egressInterface" dataType="unsigned32"
            group="scope"
            dataTypeSemantics="identifier"
            fieldId="14" applicability="all" status="current">
       <description>
         <paragraph>
           The index of the IP interface (ifIndex) where packets of
           this Flow are being sent.
         </paragraph>
       </description>
       <reference>
         See RFC 2863 for the definition of the ifIndex object.
       </reference>
     </field>

     <field name="meteringProcessId" dataType="unsigned32"
            group="scope"



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            dataTypeSemantics="identifier"
            fieldId="143" applicability="option" status="current">
       <description>
         <paragraph>
           A locally unique identifier of a Metering Process
           at an IPFIX Device.  Typically, this
           Information Element is used for limiting the scope
           of other Information Elements.
         </paragraph>
       </description>
     </field>

     <field name="exportingProcessId" dataType="unsigned32"
            group="scope"
            dataTypeSemantics="identifier"
            fieldId="144" applicability="option" status="current">
       <description>
         <paragraph>
           A locally unique identifier of an Exporting Process
           at an IPFIX Device.  Typically, this
           Information Element is used for limiting the scope
           of other Information Elements.
         </paragraph>
       </description>
     </field>

     <field name="flowId" dataType="unsigned32"
            group="scope"
            dataTypeSemantics="identifier"
            fieldId="148" applicability="option" status="current">
       <description>
         <paragraph>
           An identifier of a Flow that is unique within an Observation
           Domain. This Information Element can be used to distinguish
           between different Flows if Flow Keys such as IP addresses and
           port numbers are not reported or reported in separate
           records.
         </paragraph>
       </description>
     </field>

     <field name="templateId" dataType="unsigned16"
            group="scope"
            dataTypeSemantics="identifier"
            fieldId="145" applicability="option" status="current">
       <description>
         <paragraph>
           An identifier of a Template that is locally unique to an



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           Exporting Process.  Typically, this Information Element is
           used for limiting the scope of other Information Elements.
         </paragraph>
       </description>
     </field>

     <field name="sourceId" dataType="unsigned32"
            group="scope"
            dataTypeSemantics="identifier"
            fieldId="149" applicability="option" status="current">
       <description>
         <paragraph>
           An identifier of an Observation Domain that is locally
           unique to an Exporting Process.  Typically, this Information
           Element is used for limiting the scope of other Information
           Elements.
         </paragraph>
       </description>
     </field>

     <field name="paddingOctets" dataType="octetArray"
            group="padding"
            fieldId="210" applicability="option" status="current">
       <description>
         <paragraph>
           The value of this Information Element is always 0.
         </paragraph>
       </description>
     </field>

   </fieldDefinitions>





Appendix B.  Formal Specification of Abstract Data Types

   This appendix containfs a formal description of the abstract data
   types to be used for IPFIX Information Elements and a formal
   description of the template used for defining IPFIX Information
   Elements.  Note that this appendix is of informational nature, while
   the text in sections 2 and 3 generated from this appendix is
   normative.



   <?xml version="1.0" encoding="UTF-8"?>



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   <schema>
   <!-- <schema elementFormDefault="qualified"
           targetNamespace="http://www.ietf.org/ipfix"
           xmlns="http://www.w3.org/2001/XMLSchema"
           xmlns:ipfix="http://www.ietf.org/ipfix">  -->

     <simpleType name="dataType">
       <restriction base="string">
         <enumeration value="octet">
           <annotation>
             <documentation>The type "octet" represents a
               non-negative integer value in the range of 0 to 255.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="unsigned16">
           <annotation>
             <documentation>The type "unsigned16" represents a
               non-negative integer value in the range of 0 to 65535.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="unsigned32">
           <annotation>
             <documentation>The type "unsigned32" represents a
                non-negative integer value in the range of 0 to
                4294967295.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="unsigned64">
           <annotation>
             <documentation>The type "unsigned64" represents a
               non-negative integer value in the range of 0 to
               18446744073709551615.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="float32">
           <annotation>
             <documentation>The type "float32" corresponds to an IEEE
               single-precision 32-bit floating point type as defined
               in [IEEE.754.1985].
             </documentation>



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           </annotation>
         </enumeration>

         <enumeration value="boolean">
           <annotation>
             <documentation>The type "boolean" represents a binary
               value.  The only allowed values are "true" and false.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="macAddress">
           <annotation>
             <documentation>The type "macAddress" represents a
               string of 6 octets.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="octetArray">
           <annotation>
             <documentation>The type "octetArray" represents a finite
             length string of octets.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="string">
           <annotation>
             <documentation>
               The type "string" represents a finite length string
               of valid characters from the Unicode character encoding
               set [ISO.10646-1.1993].  Unicode allows for ASCII
               [ISO.646.1991] and many other international character
               sets to be used.  It is expected that strings will be
               encoded in UTF-8 format, which is identical in encoding
               for ASCII characters, but also accommodates other Unicode
               multi-byte characters.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="dateTimeSeconds">
           <annotation>
             <documentation>
               The type "dateTimeSeconds" represents a time value
               in units of seconds normalized to the
               GMT time zone.



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             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="dateTimeMilliSeconds">
           <annotation>
             <documentation>The type "dateTimeMilliSeconds" represents
               a time value in units of milliseconds
               normalized to the GMT time zone.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="dateTimeMicroSeconds">
           <annotation>
             <documentation>The type "dateTimeMicroSeconds" represents
               a time value in units of microseconds
               normalized to the GMT time zone.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="dateTimeNanoSeconds">
           <annotation>
             <documentation>The type "dateTimeNanoSeconds" represents
               a time value in units of nanoseconds
               normalized to the GMT time zone.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="ipv4Address">
           <annotation>
             <documentation>The type "ipv4Address" represents a value
               of an IPv4 address.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="ipv6Address">
           <annotation>
             <documentation>The type "ipv6Address" represents a value
               of an IPv6 address.
             </documentation>
           </annotation>
         </enumeration>
       </restriction>
     </simpleType>



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     <simpleType name="dataTypeSemantics">
       <restriction base="string">
         <enumeration value="quantity">
           <annotation>
             <documentation>
               A quantity value represents a discrete
               measured value pertaining to the record. This is
               distinguished from counters which represent an ongoing
               measured value whose "odometer" reading is captured as
               part of a given record. If no semantic qualifier is
               given, the Information Elements that have an integral
               data type should behave as a quantity.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="totalCounter">
           <annotation>
             <documentation>
               An integral value reporting the value of a counter.
               Basically the same semantics as counters in SNMP.
               Counters are unsigned and wrap back to zero after
               reaching the limit of the type. For example, an
               unsigned64 with counter semantics will continue to
               increment until reaching the value of 2**64 - 1.  At
               this point the next increment will wrap its value to
               zero and continue counting from zero.  A running counter
               counts independently of the export of its value.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="deltaCounter">
           <annotation>
             <documentation>
               An integral value reporting the value of a counter.
               Basically the same semantics as counters in SNMP.
               Counters are unsigned and wrap back to zero after
               reaching the limit of the type. For example, an
               unsigned64 with counter semantics will continue to
               increment until reaching the value of 2**64 - 1.  At
               this point the next increment will wrap its value to
               zero and continue counting from zero.  A delta counter
               is reset to zero each time its value is exported.
             </documentation>
           </annotation>
         </enumeration>




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         <enumeration value="identifier">
           <annotation>
             <documentation>
               An integral value which serves as an identifier.
               Specifically mathematical operations on two
               identifiers (aside from the equality operation) are
               meaningless. For example, Autonomous System ID 1 *
               Autonomous System ID 2 is meaningless.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="flags">
           <annotation>
             <documentation>
               An integral value which actually represents a set of
               bit fields.  Logical operations are appropriate on
               such values, but not other mathematical operations.
               Flags should always be of an unsigned type.
             </documentation>
           </annotation>
         </enumeration>
       </restriction>
     </simpleType>

     <simpleType name="applicability">
       <restriction base="string">
         <enumeration value="data">
           <annotation>
             <documentation>
               Used for Information Elements that are applicable to
               Flow Records only.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="option">
           <annotation>
             <documentation>
               Used for Information Elements that are applicable to
               option records only.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="all">
           <annotation>
             <documentation>



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               Used for Information Elements that are applicable to
               Flow Records as well as to option records.
             </documentation>
           </annotation>
         </enumeration>
       </restriction>
     </simpleType>

     <simpleType name="status">
       <restriction base="string">
         <enumeration value="current">
           <annotation>
             <documentation>
               Indicates that the Information Element definition
               is that the definition is current and valid.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="deprecated">
           <annotation>
             <documentation>
               Indicates that the Information Element definition is
               obsolete, but it permits new/continued implementation
               in order to foster interoperability with older/existing
               implementations.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="obsolete">
           <annotation>
             <documentation>
               Indicates that the Information Element definition is
               obsolete and should not be implemented and/or can be
               removed if previously implemented.
             </documentation>
           </annotation>
         </enumeration>
       </restriction>
     </simpleType>

   <!--
     <simpleType name="enumRange">
       <restriction base="string"/>
     </simpleType>
   -->




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     <simpleType name="range">
       <restriction base="string"/>
     </simpleType>

     <complexType name="descriptionList">
       <sequence>
         <element maxOccurs="unbounded" minOccurs="1"
                  name="item" type="string">
           <annotation>
             <documentation>to be done ...</documentation>
           </annotation>
         </element>
       </sequence>
     </complexType>

     <complexType name="text" mixed="true">
       <sequence>
         <element maxOccurs="unbounded" minOccurs="0"
                  name="paragraph" type="string">
           <annotation>
             <documentation>to be done ...</documentation>
           </annotation>
         </element>
         <element maxOccurs="unbounded" minOccurs="0"
                  name="list" type="ipfix:descriptionList">
           <annotation>
             <documentation>to be done ...</documentation>
           </annotation>
         </element>
       </sequence>
     </complexType>

     <element name="fieldDefinitions">
       <complexType>
         <sequence>
           <element maxOccurs="unbounded" minOccurs="1" name="field">
             <complexType>
               <sequence>
                 <element maxOccurs="1" minOccurs="1" name="description"
                          type="ipfix:text">
                   <annotation>
                     <documentation>
                       The semantics of this Information Element.
                       Describes how this Information Element is
                       derived from the Flow or other information
                       available to the observer.
                     </documentation>
                   </annotation>



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                 </element>
   <!--
                 <element maxOccurs="1" minOccurs="0" name="usage"
                          type="ipfix:text">
                   <annotation>
                     <documentation>to be done ...</documentation>
                   </annotation>
                 </element>
   -->
                 <element maxOccurs="1" minOccurs="0" name="units"
                          type="string">
                   <annotation>
                     <documentation>
                       If the Information Element is a measure of some
                       kind, the units identify what the measure is.
                     </documentation>
                   </annotation>
                 </element>

                 <element maxOccurs="1" minOccurs="0" name="reference"
                          type="ipfix:text">
                   <annotation>
                     <documentation>
                       Identifies additional specifications which more
                       precisely define this item or provide additional
                       context for its use.
                     </documentation>
                   </annotation>
                 </element>

   <!--
                 <element maxOccurs="1" minOccurs="0"
                          name="enumeratedRange" type="ipfix:enumRange">
                   <annotation>
                     <documentation>
                       Some items may have a specific set of numeric
                       identifiers associated with a set of discrete
                       values this Information Element may take. The
                       meaning of each discrete value and a human
                       readable name should be assigned.
                     </documentation>
                   </annotation>
                 </element>
   -->

                 <element maxOccurs="1" minOccurs="0" name="range"
                          type="ipfix:range">
                   <annotation>



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                     <documentation>
                       Some Information Elements may only be able to
                       take on a restricted set of values which can be
                       expressed as a range (e.g. 0 through 511
                       inclusive). If this is the case, the valid
                       inclusive range should be specified.
                     </documentation>
                   </annotation>
                 </element>
               </sequence>

               <attribute name="name" type="string" use="required">
                 <annotation>
                   <documentation>
                     A unique and meaningful name for the Information
                     Element.
                   </documentation>
                 </annotation>
               </attribute>

               <attribute name="dataType" type="ipfix:dataType"
                          use="required">
                 <annotation>
                   <documentation>
                     One of the types listed in section 3.1 of this
                     document or in a future extension of the
                     information model. The type space for attributes
                     is constrained to facilitate implementation.  The
                     existing type space does however encompass most
                     basic types used in modern programming languages,
                     as well as some derived types (such as ipv4Address)
                     which are common to this domain and useful
                     to distinguish.
                   </documentation>
                 </annotation>
               </attribute>

               <attribute name="dataTypeSemantics"
                          type="ipfix:dataTypeSemantics" use="optional">
                 <annotation>
                   <documentation>
                     The integral types may be qualified by additional
                     semantic details. Valid values for the data type
                     semantics are specified in section 3.2 of this
                     document or in a future extension of the
                     information model.
                   </documentation>
                 </annotation>



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               </attribute>

               <attribute name="elementId" type="nonNegativeInteger"
                          use="required">
                 <annotation>
                   <documentation>
                     A numeric identifier of the Information Element.
                     If this identifier is used without an enterprise
                     identifier (see below), then it is globally unique
                     and the list of allowed values is administered by
                     IANA.  It is used for compact identification of an
                     Information Element when encoding templates in the
                     protocol.
                   </documentation>
                 </annotation>
               </attribute>

               <attribute name="enterpriseId" type="nonNegativeInteger"
                          use="optional">
                 <annotation>
                   <documentation>
                     Enterprises may wish to define Information Elements
                     without registering them with IANA, for example for
                     enterprise-internal purposes. For such Information
                     Elements the Information Element identifier
                     described above is not sufficient when the
                     Information Element is used outside the enterprise.
                     If specifications of enterprise-specific
                     Information Elements are made public and/or if
                     enterprise-specific identifiers are used by the
                     IPFIX protocol outside the enterprise, then the
                     enterprise-specific identifier MUST be made
                     globally unique by combining it with an enterprise
                     identifier.  Valid values for the enterpriseId are
                     defined by IANA as SMI network management private
                     enterprise codes.  They are defined at
                     http://www.iana.org/assignments/enterprise-numbers.
                   </documentation>
                 </annotation>
               </attribute>

               <attribute name="applicability"
                          type="ipfix:applicability" use="required">
                 <annotation>
                   <documentation>This propoerty of an Information
                   Element indicates in which kind of records the
                   Information Element can be used.
                   Allowed values for this property are 'data',



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                   'option', and 'all'.</documentation>
                 </annotation>
               </attribute>

               <attribute name="status" type="ipfix:status"
                          use="required">
                 <annotation>
                   <documentation>
                     The status of the specification of this
                     Information Element.  Allowed values are 'current',
                     'deprecated', and 'obsolete'.
                   </documentation>
                 </annotation>
               </attribute>

               <attribute name="group" type="string"
                          use="required">
                 <annotation>
                   <documentation>to be done ...</documentation>
                 </annotation>
               </attribute>

             </complexType>
           </element>
         </sequence>
       </complexType>

       <unique name="infoElementIdUnique">
         <selector xpath="field"/>

         <field xpath="infoElementId"/>
       </unique>
     </element>
   </schema>

















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Authors' Addresses

   Juergen Quittek
   NEC
   Kurfuersten-Anlage 36
   Heidelberg  69115
   Germany

   Phone: +49 6221 90511-15
   Email: quittek@netlab.nec.de
   URI:   http://www.netlab.nec.de/


   Stewart Bryant
   Cisco Systems
   250, Longwater, Green Park
   Reading  RG2 6GB
   United Kingdom

   Email: stbryant@cisco.com


   Benoit Claise
   Cisco Systems
   De Kleetlaan 6a b1
   Diegem  1831
   Belgium

   Phone: +32 2 704 5622
   Email: bclaise@cisco.com


   Jeff Meyer
   PayPal
   2211 N. First St.
   San Jose, CA  95131-2021
   US

   Phone: +1 408 976-9149
   Email: jemeyer@paypal.com
   URI:   http://www.paypal.com










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