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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. Meyer
Internet-Draft                                                    PayPal
Expires: January 17, 2005                                     J. Quittek
                                                                     NEC
                                                               S. Bryant
                                                       Cisco Systems Ltd
                                                           July 19, 2004


            Information Model for IP Flow Information Export
                        draft-ietf-ipfix-info-04

Status of this Memo

   This document is an Internet-Draft and is in full conformance with
   all provisions of Section 10 of RFC2026.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF), its areas, and its working groups. Note that other
   groups may also distribute working documents as Internet-Drafts.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time. It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   The list of current Internet-Drafts can be accessed at http://
   www.ietf.org/ietf/1id-abstracts.txt.

   The list of Internet-Draft Shadow Directories can be accessed at
   http://www.ietf.org/shadow.html.

   This Internet-Draft will expire on January 17, 2005.

Copyright Notice

   Copyright (C) The Internet Society (2004). All Rights Reserved.

Abstract

   This memo defines and 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
   exporting process. Although developed for the IPFIX protcol, the
   model is defined in an open way that easily allows using it in other
   protocols, interfaces, and applications.





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Table of Contents

   1.   Introduction . . . . . . . . . . . . . . . . . . . . . . . .   5
   2.   Properties of IPFIX Protocol Fields  . . . . . . . . . . . .   6
   3.   Type Space . . . . . . . . . . . . . . . . . . . . . . . . .   8
   3.1  octet  . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
   3.2  unsigned16 . . . . . . . . . . . . . . . . . . . . . . . . .   8
   3.3  unsigned32 . . . . . . . . . . . . . . . . . . . . . . . . .   8
   3.4  unsigned64 . . . . . . . . . . . . . . . . . . . . . . . . .   8
   3.5  float32  . . . . . . . . . . . . . . . . . . . . . . . . . .   8
   3.6  boolean  . . . . . . . . . . . . . . . . . . . . . . . . . .   8
   3.7  octetArray . . . . . . . . . . . . . . . . . . . . . . . . .   8
   3.8  string . . . . . . . . . . . . . . . . . . . . . . . . . . .   8
   3.9  dateTimeSeconds  . . . . . . . . . . . . . . . . . . . . . .   9
   3.10 dataTimeMicroSeconds . . . . . . . . . . . . . . . . . . . .   9
   3.11 ipv4Address  . . . . . . . . . . . . . . . . . . . . . . . .   9
   3.12 ipv6Address  . . . . . . . . . . . . . . . . . . . . . . . .   9
   4.   Flow Attributes  . . . . . . . . . . . . . . . . . . . . . .  10
   4.1  deltaOctetCount  . . . . . . . . . . . . . . . . . . . . . .  10
   4.2  deltaPacketCount . . . . . . . . . . . . . . . . . . . . . .  10
   4.3  totalFlowCount . . . . . . . . . . . . . . . . . . . . . . .  10
   4.4  protocolIdentifier . . . . . . . . . . . . . . . . . . . . .  11
   4.5  classOfServiceV4 . . . . . . . . . . . . . . . . . . . . . .  11
   4.6  tcpControlBits . . . . . . . . . . . . . . . . . . . . . . .  11
   4.7  transportSourcePort  . . . . . . . . . . . . . . . . . . . .  12
   4.8  sourceAddressV4  . . . . . . . . . . . . . . . . . . . . . .  13
   4.9  sourceMaskV4 . . . . . . . . . . . . . . . . . . . . . . . .  13
   4.10 ingressInterface . . . . . . . . . . . . . . . . . . . . . .  13
   4.11 transportDestinationPort . . . . . . . . . . . . . . . . . .  14
   4.12 destinationAddressV4 . . . . . . . . . . . . . . . . . . . .  14
   4.13 destinationMaskV4  . . . . . . . . . . . . . . . . . . . . .  15
   4.14 egressInterface  . . . . . . . . . . . . . . . . . . . . . .  15
   4.15 ipNextHopAddressV4 . . . . . . . . . . . . . . . . . . . . .  15
   4.16 sourceAsNumber . . . . . . . . . . . . . . . . . . . . . . .  15
   4.17 destinationAsNumber  . . . . . . . . . . . . . . . . . . . .  16
   4.18 bgpNextHopAddressV4  . . . . . . . . . . . . . . . . . . . .  16
   4.19 OutMulticastPacketCount  . . . . . . . . . . . . . . . . . .  16
   4.20 OutMulticastOctetCount . . . . . . . . . . . . . . . . . . .  17
   4.21 flowEndTime  . . . . . . . . . . . . . . . . . . . . . . . .  17
   4.22 flowCreationTime . . . . . . . . . . . . . . . . . . . . . .  17
   4.23 deltaOutOctetCount . . . . . . . . . . . . . . . . . . . . .  17
   4.24 deltaOutPacketCount  . . . . . . . . . . . . . . . . . . . .  18
   4.25 minPacketLength  . . . . . . . . . . . . . . . . . . . . . .  18
   4.26 maxPacketLength  . . . . . . . . . . . . . . . . . . . . . .  18
   4.27 sourceAddressV6  . . . . . . . . . . . . . . . . . . . . . .  18
   4.28 destinationAddressV6 . . . . . . . . . . . . . . . . . . . .  19
   4.29 sourceMaskV6 . . . . . . . . . . . . . . . . . . . . . . . .  19
   4.30 destinationMaskV6  . . . . . . . . . . . . . . . . . . . . .  19



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   4.31 flowLabelV6  . . . . . . . . . . . . . . . . . . . . . . . .  19
   4.32 icmpTypeCode . . . . . . . . . . . . . . . . . . . . . . . .  20
   4.33 igmpType . . . . . . . . . . . . . . . . . . . . . . . . . .  20
   4.34 flowActiveTimeOut  . . . . . . . . . . . . . . . . . . . . .  20
   4.35 flowInactiveTimeout  . . . . . . . . . . . . . . . . . . . .  21
   4.36 exportedOctetCount . . . . . . . . . . . . . . . . . . . . .  21
   4.37 exportedPacketCount  . . . . . . . . . . . . . . . . . . . .  21
   4.38 exportedFlowCount  . . . . . . . . . . . . . . . . . . . . .  21
   4.39 sourcePrefixV4 . . . . . . . . . . . . . . . . . . . . . . .  22
   4.40 destinationPrefixV4  . . . . . . . . . . . . . . . . . . . .  22
   4.41 mplsTopLabelType . . . . . . . . . . . . . . . . . . . . . .  22
   4.42 mplsTopLabelIPAddressV4  . . . . . . . . . . . . . . . . . .  23
   4.43 minimumTTL . . . . . . . . . . . . . . . . . . . . . . . . .  23
   4.44 maximumTTL . . . . . . . . . . . . . . . . . . . . . . . . .  23
   4.45 identificationV4 . . . . . . . . . . . . . . . . . . . . . .  23
   4.46 sourceMacAddress . . . . . . . . . . . . . . . . . . . . . .  24
   4.47 ipVersion  . . . . . . . . . . . . . . . . . . . . . . . . .  24
   4.48 ipNextHopAddressV6 . . . . . . . . . . . . . . . . . . . . .  24
   4.49 bgpNextHopAddressV6  . . . . . . . . . . . . . . . . . . . .  25
   4.50 ipv6OptionHeaders  . . . . . . . . . . . . . . . . . . . . .  25
   4.51 partialMPLSLabelStackEntry1  . . . . . . . . . . . . . . . .  26
   4.52 partialMPLSLabelStackEntry2  . . . . . . . . . . . . . . . .  26
   4.53 partialMPLSLabelStackEntry3  . . . . . . . . . . . . . . . .  27
   4.54 partialMPLSLabelStackEntry4  . . . . . . . . . . . . . . . .  27
   4.55 partialMPLSLabelStackEntry5  . . . . . . . . . . . . . . . .  27
   4.56 partialMPLSLabelStackEntry6  . . . . . . . . . . . . . . . .  28
   4.57 partialMPLSLabelStackEntry7  . . . . . . . . . . . . . . . .  28
   4.58 partialMPLSLabelStackEntry8  . . . . . . . . . . . . . . . .  28
   4.59 partialMPLSLabelStackEntry9  . . . . . . . . . . . . . . . .  29
   4.60 partialMPLSLabelStackEntry10 . . . . . . . . . . . . . . . .  29
   4.61 runningOctetCounter  . . . . . . . . . . . . . . . . . . . .  29
   4.62 runningPacketCounter . . . . . . . . . . . . . . . . . . . .  30
   4.63 bgpNextHopAsNumber . . . . . . . . . . . . . . . . . . . . .  30
   4.64 ipNextHopAsNumber  . . . . . . . . . . . . . . . . . . . . .  30
   4.65 exporterAddressV4  . . . . . . . . . . . . . . . . . . . . .  31
   4.66 exporterAddressV6  . . . . . . . . . . . . . . . . . . . . .  31
   4.67 droppedOctetDeltaCount . . . . . . . . . . . . . . . . . . .  31
   4.68 droppedPacketDeltaCount  . . . . . . . . . . . . . . . . . .  32
   4.69 droppedOctetTotalCount . . . . . . . . . . . . . . . . . . .  32
   4.70 droppedPacketTotalCount  . . . . . . . . . . . . . . . . . .  32
   4.71 flowEndReason  . . . . . . . . . . . . . . . . . . . . . . .  32
   4.72 classOfServiceV6 . . . . . . . . . . . . . . . . . . . . . .  33
   5.   Extending the Information Model  . . . . . . . . . . . . . .  34
   6.   IANA Considerations  . . . . . . . . . . . . . . . . . . . .  35
   7.   Security Considerations  . . . . . . . . . . . . . . . . . .  36
   8.   Acknowledgements . . . . . . . . . . . . . . . . . . . . . .  37
        Normative Reference  . . . . . . . . . . . . . . . . . . . .  38
        Informative Reference  . . . . . . . . . . . . . . . . . . .  39



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        Authors' Addresses . . . . . . . . . . . . . . . . . . . . .  40
   A.   Formal Specification of IPFIX Fields . . . . . . . . . . . .  41
   B.   Formal Specification of Abstract Data Types  . . . . . . . .  63
        Intellectual Property and Copyright Statements . . . . . . .  73















































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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 [IPFIX-PROTO] defines how
   information elements are transmitted.  For information elements, it
   specifies the encoding of a set of basic data types.  However, the
   list of fields 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, smapling rate, flow timeout interval, etc.), is
   not specified in [IPFIX-PROTO].

   This document complements the IPFIX protocol specification by
   providing the IPFIX information model.  The main part of this
   document is Section 5 defines the (extensible) list of fields to be
   transmitted by the IPFIX protcol.  Section 2 defines a template for
   specifying IPFIX fields that is used in Section 4.  Section 3 defines
   the set of abstract data types that are available for IPFIX fields.
   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 fields can be used for automatically checking
   syntactical correctness of the specification of IPFIX fields.
   Further it can be used for generating IPFIX protocol implementation
   code that deals with processing IPFIX fields.  Also code for
   applications that further process traffic information transmitted via
   the IPFIX protocol can be generated with the XML specification of
   IPFIX fields.

   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.













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2. Properties of IPFIX Protocol Fields

   Fields of the IPFIX protocol carrying information about traffic
   measurement are modeled as elements of the IPFIX information model
   and specified in Section 4.  For defining the fields, a template is
   used that is specified below.

   All fields specified for the IPFIX protocol either in this document
   or by an extension MUST have the following properties defined:

   name - A unique and meaningful name for the field. The preferred
      spelling for the name is to use mixed case if the name is
      compound, with an initial lower case letter. (E.g.
      "sourceIpAddress").

   fieldType - A numeric identifier administered by IANA. This is used
      for compact identification of an information item when encoding
      templates in the protocol.

   description - The semantics of this information element. Describes
      how this field is derived from the flow or other information
      available to the observer.

   dataType - One of the types listed in the "Type Space" section. 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 IPAddress) which are common to this
      domain and useful to distinguish.

   dataTypeSemantics - The integral types may be qualified by additional
      semantic details. Qualifying the fields as 'quantity', 'counter',
      'identifier' or 'flags'.

   applicability - to be done ...

   status - to be done ...

   All fields specified for the IPFIX protocol either in this document
   or by an extension MAY have the following properties defined:

   vendorId - When extension is done outside of the scope of the IANA
      IPFIX fieldId range, a vendorId MUST be provided. This identifier
      is based on IANA assigned enterprise identifiers.

   usage - to be done ...





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

   enumeratedRange - Some items may have a specific set of numeric
      identifiers associated with a set of discrete values this element
      may take. The meaning of each discrete value and a human readable
      name should be assigned.

   range - Some 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.




































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3. Type Space

   The following subsections describe the abstract data types that can
   be used for the specification of IPFIX fields in Section 4.

3.1 octet

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

3.2 unsigned16

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

3.3 unsigned32

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

3.4 unsigned64

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

3.5 float32

   The type "float32" corresponds to an IEEE single-precision 32-bit
   floating point type.

3.6 boolean

   The type "boolean" represents a binary value.

3.7 octetArray

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

3.8 string

   The type "string" represents a finite length string of valid
   characters from the Unicode character encoding set. Unicode allows
   for ASCII 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 USASCII characters, but also accomodates
   other Unicode multibyte characters.





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3.9 dateTimeSeconds

   The type "dateTimeSeconds" represents a time value having a precision
   of seconds and normalized to the GMT timezone. Such types are in
   common use on many operating systems and have the advantage that they
   can be stored in 32-bit integers.

3.10 dataTimeMicroSeconds

   The type "dateTimeSeconds" represents a time value having a precision
   of microseconds and normalized to the GMT timezone.

3.11 ipv4Address

   The type "ipv4Addr" represents a value of an IPv4 address. These
   addresses are typically stored as 32-bit integers.

3.12 ipv6Address

   The type "ipv6Addr" represents a value of an IPv6 address.































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4. Flow Attributes

4.1 deltaOctetCount

   Description:

      The number of octets in (incoming) packets observed for this flow
      at the observation point since the previous report (if any). The
      number of octets include IP header(s) and IP payload.

   Abstract Data Type: unsigned64

   Data Type Semantics: deltaCounter

   Field Id: 1

   Units: octets

4.2 deltaPacketCount

   Description:

      The number of (incoming) packets observed for this flow at the
      observation point since the previous report (if any).

   Abstract Data Type: unsigned64

   Data Type Semantics: deltaCounter

   Field Id: 2

   Units: packets

4.3 totalFlowCount

   Description:

      The number of flows observed so far in the observation domain.

   Abstract Data Type: unsigned64

   Data Type Semantics: runningCounter

   Field Id: 3

   Units: flows





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4.4 protocolIdentifier

   Description:

      The protocol number observed for packets of this flow. The
      protocol number identifies the IP packet payload. 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.

   Abstract Data Type: octet

   Data Type Semantics: identifier

   Field Id: 4

   Reference:

      See RFC 791 for the specification of the IPv4 protocol field. See
      RFC 2460 for the specification of the IPv6 protocol field. See
      list of protocol numbers assigned by IANA at http://www.iana.org/
      assignments/protocol-numbers.


4.5 classOfServiceV4

   Description:

      The value of the IPv4 TOS field observed for packets of this flow.

   Abstract Data Type: octet

   Data Type Semantics: identifier

   Field Id: 5

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


4.6 tcpControlBits

   Description:






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      TCP control bits observed for packets of this flow. The value of
      this field is the result of a logical OR operation over the flags
      observed in all packets of the flow. This implies that a 0 value
      for a bit indicates that the respective 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

   Field Id: 6

   Reference: See RFC 793 for a definition of the TCP control bits in
      the TCP header.


4.7 transportSourcePort

   Description:

      A source port identifier in the transport header. For 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

   Field Id: 7





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   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.


4.8 sourceAddressV4

   Description:

      IPv4 source address taken from the IP packet header of a packet of
      this flow.

   Abstract Data Type: ipv4Address

   Field Id: 8

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


4.9 sourceMaskV4

   Description:

      The number of contiguous bits that are relevant in the
      sourceAddressV4 field.

   Abstract Data Type: octet

   Field Id: 9

   Units: bits

4.10 ingressInterface

   Description:

      The index of the IP interface (ifIndex) where packets of this flow
      are being received.

   Abstract Data Type: unsigned32

   Data Type Semantics: identifier



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   Field Id: 10

   Reference: See RFC 2863 for the definition of the ifIndex object.


4.11 transportDestinationPort

   Description:

      A destination port identifier in the transport header. For
      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.

   Abstract Data Type: unsigned16

   Data Type Semantics: identifier

   Field Id: 11

   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.


4.12 destinationAddressV4

   Description:

      IPv4 destination address taken from the IP packet header of a
      packet of this flow.

   Abstract Data Type: ipv4Address

   Field Id: 12

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







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4.13 destinationMaskV4

   Description:

      The number of contiguous bits that are relevant in the
      destinationAddressV4 field.

   Abstract Data Type: octet

   Field Id: 13

   Units: bits

4.14 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

   Field Id: 14

   Reference: See RFC 2863 for the definition of the ifIndex object.


4.15 ipNextHopAddressV4

   Description:

      The IPv4 address of the next IP hop to which packets of this flow
      are forwarded.

   Abstract Data Type: ipv4Address

   Field Id: 15

4.16 sourceAsNumber

   Description:

      The autonomous system (AS) number of the source address in the IP
      packet header in a packet of this flow.

   Abstract Data Type: unsigned16



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   Data Type Semantics: identifier

   Field Id: 16

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


4.17 destinationAsNumber

   Description:

      The autonomous system (AS) number of the destination address in
      the IP packet header in a packet of this flow.

   Abstract Data Type: unsigned16

   Data Type Semantics: identifier

   Field Id: 17

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


4.18 bgpNextHopAddressV4

   Description:

      The IPv4 address of the next BGP hop to which packets of this flow
      are forwarded.

   Abstract Data Type: ipv4Address

   Field Id: 18

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


4.19 OutMulticastPacketCount

   Description:

      The number of outgoing multicast packets created for packets of
      this flow by an adjacent multicast daemon. Note that typically not
      all of the created packets can be observed at the observation
      point of this flow.



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   Abstract Data Type: unsigned64

   Field Id: 19

   Units: packets

4.20 OutMulticastOctetCount

   Description:

      The number of octets in outgoing multicast packets created for
      packets of this flow by an adjacent multicast daemon. Note that
      typically not all of the created packets can be observed at the
      observation point of this flow.

   Abstract Data Type: unsigned64

   Field Id: 20

   Units: octets

4.21 flowEndTime

   Description: The timestamp of the last packet of this flow.

   Abstract Data Type: dateTimeSeconds

   Field Id: 21

4.22 flowCreationTime

   Description: The timestamp of the first packet of this flow.

   Abstract Data Type: dateTimeSeconds

   Field Id: 22

4.23 deltaOutOctetCount

   Description:

      The number of octets in outgoing packets observed for this flow at
      the observation point since the previous report (if any). The
      number of octets include IP header(s) and IP payload.

   Abstract Data Type: unsigned64

   Data Type Semantics: deltaCounter



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   Field Id: 23

   Units: octets

4.24 deltaOutPacketCount

   Description:

      The number of outgoing packets observed for this flow at the
      observation point since the previous report (if any).

   Abstract Data Type: unsigned64

   Data Type Semantics: deltaCounter

   Field Id: 24

   Units: packets

4.25 minPacketLength

   Description:

      Length of the smallest packet observed for this flow.

   Abstract Data Type: unsigned16

   Field Id: 25

   Units: octets

4.26 maxPacketLength

   Description:

      Length of the largest packet observed for this flow.

   Abstract Data Type: unsigned16

   Field Id: 26

   Units: octets

4.27 sourceAddressV6

   Description:





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      IPv6 source address taken from the IP packet header of a packet of
      this flow.

   Abstract Data Type: ipv6Address

   Field Id: 27

4.28 destinationAddressV6

   Description:

      IPv6 destination address taken from the IP packet header of a
      packet of this flow.

   Abstract Data Type: ipv6Address

   Field Id: 28

4.29 sourceMaskV6

   Description:

      The number of contiguous bits that are relevant in the
      sourceAddressV6 field.

   Abstract Data Type: octet

   Field Id: 29

   Units: bits

4.30 destinationMaskV6

   Description:

      The number of contiguous bits that are relevant in the
      destinationAddressV6 field.

   Abstract Data Type: octet

   Field Id: 30

   Units: bits

4.31 flowLabelV6






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   Description:

      The Flow Label of the IPv6 packet header observed in a packet of
      this flow.

   Abstract Data Type: unsigned32

   Field Id: 31

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


4.32 icmpTypeCode

   Description:

      Type and Code of the ICMP message. The combination of both values
      is reported as (ICMP type * 256) + ICMP code.

   Abstract Data Type: unsigned16

   Field Id: 32

   Reference: See RFC 792 for a definition of the ICMP type and code
      fields.


4.33 igmpType

   Description: The type field of the IGMP message.

   Abstract Data Type: octet

   Field Id: 33

   Reference: See RFC 2236 for a definition of the IGMP type field.


4.34 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




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   Field Id: 36

   Units: seconds

4.35 flowInactiveTimeout

   Description:

      A flow is considered to be timed out if not packet belonging to
      the flow has been observed for the number of seconds specified by
      this field.

   Abstract Data Type: unsigned16

   Field Id: 37

   Units: seconds

4.36 exportedOctetCount

   Description:

      The number of all octets reported by the exporting process to this
      collecting process.

   Abstract Data Type: unsigned64

   Field Id: 40

   Units: octets

4.37 exportedPacketCount

   Description:

      The number of all packets reported by the exporting process to
      this collecting process.

   Abstract Data Type: unsigned64

   Field Id: 41

   Units: packets

4.38 exportedFlowCount






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   Description:

      The number of all flows records reported by the exporting process
      to this collecting process.

   Abstract Data Type: unsigned64

   Field Id: 42

   Units: flows

4.39 sourcePrefixV4

   Description:

      IPv4 source address prefix.

      EDITOR'S NOTE: to be discussed on ipfix mailing list

   Abstract Data Type: ipV4Address

   Field Id: 44

   Units: flows

4.40 destinationPrefixV4

   Description:

      IPv4 destination address prefix.

      EDITOR'S NOTE: to be discussed on ipfix mailing list

   Abstract Data Type: ipV4Address

   Field Id: 45

   Units: flows

4.41 mplsTopLabelType

   Description:

      MPLS top label type:

      This field identifies the control protocol that allocated the top
      of stack label.




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   Abstract Data Type: octet

   Data Type Semantics: identifier

   Field Id: 46

4.42 mplsTopLabelIPAddressV4

   Description:

      The IPv4 address of the system that the MPLS top label will cause
      this packet to be forwarded to.

   Abstract Data Type: ipV4Address

   Field Id: 47

4.43 minimumTTL

   Description:

      Minimum TTL value observed for any packet in this flow.

   Abstract Data Type: octet

   Field Id: 52

4.44 maximumTTL

   Description:

      Maximum TTL value observed for any packet in this flow.

   Abstract Data Type: octet

   Field Id: 53

4.45 identificationV4

   Description:

      Packet identification field from the first IP packet of this flow.

   Abstract Data Type: octet

   Data Type Semantics: identifier

   Field Id: 54



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


4.46 sourceMacAddress

   Description:

      Packet identification field from the first IP packet of this flow.

   Abstract Data Type: octet

   Field Id: 56

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


4.47 ipVersion

   Description: The IP version field given in the IP header.

   Abstract Data Type: octet

   Field Id: 60

   Units: flows

   Reference:

      See RFC 791 for a definition of the version field in the IPv6
      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.


4.48 ipNextHopAddressV6

   Description:

      The IPv6 address of the next BGP hop to which packets of this flow
      are forwarded.

   Abstract Data Type: ipv6Address

   Field Id: 62




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4.49 bgpNextHopAddressV6

   Description:

      The IPv6 address of the next BGP hop to which packets of this flow
      are forwarded.

   Abstract Data Type: ipv6Address

   Data Type Semantics: identifier

   Field Id: 63

   Reference: See RFC 1771 for a description of BGB-4. See RFC 1930 a
      definition of the AS number.


4.50 ipv6OptionHeaders

   Description:

      IPv6 options in the IP packet headers of this flow. This is
      encoded as a bit field.

      bit      IPv6 Option    Definition

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

   Abstract Data Type: unsigned32




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   Data Type Semantics: flags

   Field Id: 64

   Reference: To be done.


4.51 partialMPLSLabelStackEntry1

   Description:

      The label, exp and s fields from the outermost MPLS label stack
      entry e.g. the last label that was pushed last.

       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

   Field Id: 70

   Reference: See RFC 3032.


4.52 partialMPLSLabelStackEntry2

   Description:

      The label, exp and s fields from the LSE that was pushed
      immediately before the LSE that would be reported by
      partialMplsLse1. See the definition of partialMplsLse1 for further
      details.

   Abstract Data Type: unsigned32

   Field Id: 71

   Reference: See RFC 3032.






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4.53 partialMPLSLabelStackEntry3

   Description:

      The label, exp and s fields from the LSE that was pushed
      immediately before the LSE that would be reported by
      partialMplsLse2. See the definition of partialMplsLse1 for further
      details.

   Abstract Data Type: unsigned32

   Field Id: 72

   Reference: See RFC 3032.


4.54 partialMPLSLabelStackEntry4

   Description:

      The label, exp and s fields from the LSE that was pushed
      immediately before the LSE that would be reported by
      partialMplsLse3. See the definition of partialMplsLse1 for further
      details.

   Abstract Data Type: unsigned32

   Field Id: 73

   Reference: See RFC 3032.


4.55 partialMPLSLabelStackEntry5

   Description:

      The label, exp and s fields from the LSE that was pushed
      immediately before the LSE that would be reported by
      partialMplsLse4. See the definition of partialMplsLse1 for further
      details.

   Abstract Data Type: unsigned32

   Field Id: 74

   Reference: See RFC 3032.





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4.56 partialMPLSLabelStackEntry6

   Description:

      The label, exp and s fields from the LSE that was pushed
      immediately before the LSE that would be reported by
      partialMplsLse5. See the definition of partialMplsLse1 for further
      details.

   Abstract Data Type: unsigned32

   Field Id: 75

   Reference: See RFC 3032.


4.57 partialMPLSLabelStackEntry7

   Description:

      The label, exp and s fields from the LSE that was pushed
      immediately before the LSE that would be reported by
      partialMplsLse6. See the definition of partialMplsLse1 for further
      details.

   Abstract Data Type: unsigned32

   Field Id: 76

   Reference: See RFC 3032.


4.58 partialMPLSLabelStackEntry8

   Description:

      The label, exp and s fields from the LSE that was pushed
      immediately before the LSE that would be reported by
      partialMplsLse7. See the definition of partialMplsLse1 for further
      details.

   Abstract Data Type: unsigned32

   Field Id: 77

   Reference: See RFC 3032.





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4.59 partialMPLSLabelStackEntry9

   Description:

      The label, exp and s fields from the LSE that was pushed
      immediately before the LSE that would be reported by
      partialMplsLse8. See the definition of partialMplsLse1 for further
      details.

   Abstract Data Type: unsigned32

   Field Id: 78

   Reference: See RFC 3032.


4.60 partialMPLSLabelStackEntry10

   Description:

      The label, exp and s fields from the LSE that was pushed
      immediately before the LSE that would be reported by
      partialMplsLse9. See the definition of partialMplsLse1 for further
      details.

   Abstract Data Type: unsigned32

   Field Id: 79

   Reference: See RFC 3032.


4.61 runningOctetCounter

   Description:

      Number of observed octets for a pre-defined permanent flow.

      EDITOR'S NOTE: clarification required.

   Abstract Data Type: unsigned64

   Data Type Semantics: runningCounter

   Field Id: 85

   Units: octets




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4.62 runningPacketCounter

   Description:

      Number of observed packets for a pre-defined permanent flow.

      EDITOR'S NOTE: clarification required.

   Abstract Data Type: unsigned64

   Data Type Semantics: runningCounter

   Field Id: 86

   Units: packets

4.63 bgpNextHopAsNumber

   Description:

      The autonomous system (AS) number of the next BGP hop to which
      packets of this flow are forwarded.

   Abstract Data Type: unsigned16

   Data Type Semantics: identifier

   Field Id: 128

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


4.64 ipNextHopAsNumber

   Description:

      The autonomous system (AS) number of the next IP hop to which
      packets of this flow are forwarded.

   Abstract Data Type: unsigned16

   Data Type Semantics: identifier

   Field Id: 129






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


4.65 exporterAddressV4

   Description:

      The IPv4 address of the 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

   Field Id: 130

4.66 exporterAddressV6

   Description:

      The IPv6 address of the 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

   Field Id: 131

4.67 droppedOctetDeltaCount

   Description:

      The number of octets in packets of this flow dropped by packet
      treatment.

   Abstract Data Type: unsigned64

   Data Type Semantics: deltaCounter

   Field Id: 132

   Units: octets



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4.68 droppedPacketDeltaCount

   Description:

      The number of packets of this flow dropped by packet treatment.

   Abstract Data Type: unsigned64

   Data Type Semantics: deltaCounter

   Field Id: 133

   Units: packets

4.69 droppedOctetTotalCount

   Description:

      The number of octets in packets of this flow dropped by packet
      treatment.

   Abstract Data Type: unsigned64

   Data Type Semantics: runningCounter

   Field Id: 134

   Units: octets

4.70 droppedPacketTotalCount

   Description:

      The number of packets of this flow dropped by packet treatment.

   Abstract Data Type: unsigned64

   Data Type Semantics: runningCounter

   Field Id: 135

   Units: packets

4.71 flowEndReason

   Description:





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      The reason for flow termination.

      EDITORS' NOTE: This needs to be defined as an enumerated range.

   Abstract Data Type: octet

   Field Id: 136

4.72 classOfServiceV6

   Description:

      The value of the IPv6 traffic class field observed for packets of
      this flow.

   Abstract Data Type: octet

   Field Id: 135

   Reference: See RFC 2460 for the definition of the IPv6 traffic class
      field.






























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5. Extending the Information Model

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

   The IPFIX protocol carries flow records defined by a template.
   Multiple templates may be defined for a dialog between an exporter
   and a collector. A given template identifies the information items
   and their order. The means of identification of information items in
   a template is via a field ID. Field Id's are unique identifiers
   administered by IANA.

   Extension is done by defining new Information elements, including the
   set of necessary information and possibly additional optional
   information for each element. Each new information item MUST be
   assigned a unique fieldId as part of its definition. These unique
   field ids are the connection between the record structure
   communicated by the protocol using templates and a consuming
   application.

   Vendor specific extensions may be made by vendors with IANA
   enterprise ID assignments, without registering specific field ID's
   with IANA.  In these cases the field definiton must specify the
   vendor ID as well as the vendor-specified field ID and other
   mandatory field properties.  Before creating vendor-specific fields,
   the general applicability of such information elements should be
   considered. For generally applicable fields using IETF and IANA
   mechanisms for extendind the information model is recommended.






















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6. IANA Considerations

   IANA has to create a new registry for IPFIX fields ID's.

   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 namaspace, 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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7. 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 therefor 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.








































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8. Acknowledgements

   The editors thank Stewart Bryant for a lot of useful input on the
   field definitions.  Also many thanks to Thomas Dietz for developing
   the XSLT scripts that generate large portions of the text part of
   this document from the XML appendices.













































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Normative Reference

   [1]  Claise, B., Fullmer, M., Calato, P. and R. Penno, "IPFIX
        Protocol Specification", IETF draft work in progress, January
        2004, <http://www.ietf.org/internet-drafts/
        draft-ietf-ipfix-protocol-02.txt>.













































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Informative Reference

   [2]   Quittek, J., Zseby, T., Claise, B. and S. Zander, "Requirements
         for IP Flow Information Export", IETF draft work in progress,
         January 2004, <http://www.ietf.org/internet-drafts/
         draft-ietf-ipfix-reqs-15.txt>.

   [3]   Sadasivan, G. and N. Brownlee, "Architecture Model for IP Flow
         Information Export", IETF draft work in progress, October 2003,
         <http://www.ietf.org/internet-drafts/
         draft-ietf-ipfix-arch-02.txt>.

   [4]   Zseby, T., Penno, R., Claise, B. and N. Brownlee, "IPFIX
         Applicability", IETF draft work in progress, October 2003,
         <http://www.ietf.org/internet-drafts/
         draft-ietf-ipfix-as-01.txt>.

   [5]   Claise, B., "Cisco Systems NetFlow Services Export Version 9",
         IETF draft work in progress, June 2003, <http://www.ietf.org/
         internet-drafts/draft-claise-netflow-9-02.txt>.

   [6]   World Wide Web Consortium, "Extensible Markup Language (XML)
         1.0", W3C XML, February 1998, <http://www.w3.org/TR/1998/
         REC-xml-19980210>.

   [7]   World Wide Web Consortium, "XML Schema Part 1: Structures", W3C
         XML, May 2001, <http://www.w3.org/TR/2001/
         REC-xmlschema-1-20010502/>.

   [8]   World Wide Web Consortium, "XML Schema Part 2: Datatypes", W3C
         XML, May 2001, <http://www.w3.org/TR/2001/
         REC-xmlschema-2-20010502/datatypes.html>.

   [9]   Internet Protocol Detail Record Organization, "Network Data
         Management - Usage (NDM-U) For IP-Based Services Version
         3.1.1", October 2002, <http://www.ipdr.org/documents/
         NDM-U_3.1.1.pdf>.

   [10]  Brownlee, N. and A. Blount, "Accounting Attributes and Record
         Formats", RFC 2924, Sept. 2000, <http://www.ietf.org/rfc/
         rfc2924.txt>.

   [11]  Rose, M., "Writing I-Ds and RFCs using XML", RFC 2629, June
         1999, <http://xml.resource.org/public/rfc/html/rfc2629.html>.

   [12]  Hollenbeck, S., Rose, M. and L. Masinter, "Guidelines for the
         Use of Extensible Markup Language (XML) within IETF Protocols",
         RFC 3470, January 2003, <http://www.ietf.org/rfc/rfc3470.txt>.



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   [13]  Pras, A. and J. Schoenwaelder, "On the Difference between
         Information Models and Data Models", RFC 3444, January 2003,
         <http://www.ietf.org/rfc/rfc3444.txt>.

   [14]  Mealling, M., "The IETF XML Registry", RFC 3688, January 2004,
         <http://www.ietf.org/rfc/rfc3688.txt>.


Authors' Addresses

   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


   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 Ltd
   250, Longwater, Green Park
   Reading  RG2 6GB
   United Kingdom

   EMail: stbryant@cisco.com












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Appendix A. Formal Specification of IPFIX Fields

   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.
   hardcoding their behavior or inventing proprietary means for
   accomodating extensions.


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

     <field name="deltaOctetCount" dataType="unsigned64"
            dataTypeSemantics="deltaCounter"
            fieldType="1" applicability="data" status="current">
       <description>
         <paragraph>
         The number of octets in (incoming) packets observed for this
         flow at the observation point since the previous report (if any).
         The number of octets include IP header(s) and IP payload.
         </paragraph>
       </description>
       <units>octets</units>
     </field>

     <field name="deltaPacketCount" dataType="unsigned64"
            dataTypeSemantics="deltaCounter"
            fieldType="2" applicability="data" status="current">
       <description>



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         <paragraph>
         The number of (incoming) packets observed for this flow at
         the observation point since the previous report (if any).
         </paragraph>
       </description>
       <units>packets</units>
     </field>

     <field name="totalFlowCount" dataType="unsigned64"
            dataTypeSemantics="runningCounter"
            fieldType="3" applicability="data" status="current">
       <description>
         <paragraph>
         The number of flows observed so far in the observation domain.
         </paragraph>
       </description>
       <units>flows</units>
     </field>

     <field name="protocolIdentifier" dataType="octet"
            dataTypeSemantics="identifier"
            fieldType="4" applicability="all" status="current">
       <description>
         <paragraph>
         The protocol number observed for packets of this flow.
         The protocol number identifies the IP packet payload.
         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 list of protocol numbers assigned by IANA at
         http://www.iana.org/assignments/protocol-numbers.
         </paragraph>
       </reference>
     </field>

     <field name="classOfServiceV4" dataType="octet"
            dataTypeSemantics="identifier"
            fieldType="5" applicability="all" status="current">



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       <description>
         <paragraph>
         The value of the IPv4 TOS field observed for packets of this flow.
         </paragraph>
       </description>
       <reference>
         See RFC 791 for the definition of the IPv4 TOS field.
       </reference>
     </field>

     <field name="tcpControlBits" dataType="octet"
            dataTypeSemantics="flags"
            fieldType="6" applicability="all" status="current">
       <description>
         <paragraph>
         TCP control bits observed for packets of this flow.
         The value of this field is the result of a logical OR operation
         over the flags observed in all packets of the flow.
         This implies that a 0 value for a bit indicates that the
         respective bit was not set in any of the observed packets
         of this flow.</paragraph>

         <paragraph>to be replaced by ASCII drawing</paragraph>
         <paragraph>to be replaced by ASCII drawing</paragraph>
         <paragraph>to be replaced by ASCII drawing</paragraph>
         <paragraph>to be replaced by ASCII drawing</paragraph>
         <paragraph>to be replaced by ASCII drawing</paragraph>
         <paragraph>to be replaced by ASCII drawing</paragraph>
         <paragraph>to be replaced by ASCII drawing</paragraph>
         <paragraph>to be replaced by ASCII drawing</paragraph>
       </description>
       <reference>See RFC 793 for a definition of the TCP control bits
       in the TCP header.</reference>
     </field>

     <field name="transportSourcePort" dataType="unsigned16"
            dataTypeSemantics="identifier"
            fieldType="7" applicability="all" status="current">
       <description>
         <paragraph>
         A source port identifier in the transport header. For 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>



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         <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="sourceAddressV4" dataType="ipv4Address"
            fieldType="8" applicability="all" status="current">
       <description>
         <paragraph>
         IPv4 source address taken from the IP packet header of a
         packet of this flow.
         </paragraph>
       </description>
       <reference>
         See RFC 791 for the definition of the IPv4 source address
         field.
       </reference>
     </field>

     <field name="sourceMaskV4" dataType="octet"
            fieldType="9" applicability="option" status="current">
       <description>
         <paragraph>
         The number of contiguous bits that are relevant in the
         sourceAddressV4 field.
         </paragraph>
       </description>
       <units>bits</units>
       <range>0-32</range>
     </field>

     <field name="ingressInterface" dataType="unsigned32"
            dataTypeSemantics="identifier"
            fieldType="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.



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       </reference>
     </field>

     <field name="transportDestinationPort" dataType="unsigned16"
            dataTypeSemantics="identifier"
            fieldType="11" applicability="all" status="current">
       <description>
         <paragraph>
         A destination port identifier in the transport header.
         For 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>
       </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="destinationAddressV4" dataType="ipv4Address"
            fieldType="12" applicability="all" status="current">
       <description>
         <paragraph>
         IPv4 destination address taken from the IP packet header of a
         packet of this flow.
         </paragraph>
       </description>
       <reference>
         See RFC 791 for the definition of the IPv4 destination address
         field.
       </reference>
     </field>

     <field name="destinationMaskV4" dataType="octet"
            fieldType="13" applicability="option" status="current">
       <description>
         <paragraph>
         The number of contiguous bits that are relevant in the
         destinationAddressV4 field.



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         </paragraph>
       </description>
       <units>bits</units>
       <range>0-32</range>
     </field>

     <field name="egressInterface" dataType="unsigned32"
            dataTypeSemantics="identifier"
            fieldType="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="ipNextHopAddressV4" dataType="ipv4Address"
            fieldType="15" applicability="data" status="current">
       <description>
         <paragraph>
         The IPv4 address of the next IP hop to which packets of
         this flow are forwarded.
         </paragraph>
       </description>
     </field>

     <field name="sourceAsNumber" dataType="unsigned16"
            dataTypeSemantics="identifier"
            fieldType="16" applicability="all" status="current">
       <description>
         <paragraph>
         The autonomous system (AS) number of the source address in
         the IP packet header in a packet of this flow.
         </paragraph>
       </description>
       <reference>
         See RFC 1771 for a description of BGB-4 and
         see RFC 1930 a definition of the AS number.
       </reference>
     </field>

     <field name="destinationAsNumber" dataType="unsigned16"
            dataTypeSemantics="identifier"
            fieldType="17" applicability="all" status="current">



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       <description>
         <paragraph>
         The autonomous system (AS) number of the destination address
         in the IP packet header in a packet of this flow.
         </paragraph>
       </description>
       <reference>
         See RFC 1771 for a description of BGB-4 and
         see RFC 1930 a definition of the AS number.
       </reference>
     </field>

     <field name="bgpNextHopAddressV4" dataType="ipv4Address"
            fieldType="18" applicability="all" status="current">
       <description>
         <paragraph>
         The IPv4 address of the next BGP hop to which packets of
         this flow are forwarded.
         </paragraph>
       </description>
       <reference>
         See RFC 1771 for a description of BGB-4 and
         see RFC 1930 a definition of the AS number.
       </reference>
     </field>

     <field name="OutMulticastPacketCount" dataType="unsigned64"
            fieldType="19" applicability="data" status="current">
       <description>
         <paragraph>
         The number of outgoing multicast packets created for packets
         of this flow by an adjacent multicast daemon.
         Note that typically not all of the created packets can be
         observed at the observation point of this flow.
         </paragraph>
       </description>
       <units>packets</units>
     </field>

     <field name="OutMulticastOctetCount" dataType="unsigned64"
            fieldType="20" applicability="data" status="current">
       <description>
         <paragraph>
         The number of octets in outgoing multicast packets created
         for packets of this flow by an adjacent multicast daemon.
         Note that typically not all of the created packets can be
         observed at the observation point of this flow.
         </paragraph>



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       </description>
       <units>octets</units>
     </field>

     <field name="flowEndTime" dataType="dateTimeSeconds"
            fieldType="21" applicability="data" status="current">
       <description>
         The timestamp of the last packet of this flow.
       </description>
     </field>

     <field name="flowCreationTime" dataType="dateTimeSeconds"
            fieldType="22" applicability="data" status="current">
       <description>
         The timestamp of the first packet of this flow.
       </description>
     </field>

     <field name="deltaOutOctetCount" dataType="unsigned64"
            dataTypeSemantics="deltaCounter"
            fieldType="23" applicability="data" status="current">
       <description>
         <paragraph>
         The number of octets in outgoing packets observed for this
         flow at the observation point since the previous report (if any).
         The number of octets include IP header(s) and IP payload.
         </paragraph>
       </description>
       <units>octets</units>
     </field>

     <field name="deltaOutPacketCount" dataType="unsigned64"
            dataTypeSemantics="deltaCounter"
            fieldType="24" applicability="data" status="current">
       <description>
         <paragraph>
         The number of outgoing packets observed for this flow at
         the observation point since the previous report (if any).
         </paragraph>
       </description>
       <units>packets</units>
     </field>

     <field name="minPacketLength" dataType="unsigned16"
            fieldType="25" applicability="all" status="current">
       <description>
         <paragraph>
         Length of the smallest packet observed for this flow.



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         </paragraph>
       </description>
       <units>octets</units>
     </field>

     <field name="maxPacketLength" dataType="unsigned16"
            fieldType="26" applicability="all" status="current">
       <description>
         <paragraph>
         Length of the largest packet observed for this flow.
         </paragraph>
       </description>
       <units>octets</units>
     </field>

     <field name="sourceAddressV6" dataType="ipv6Address"
            fieldType="27" applicability="all" status="current">
       <description>
         <paragraph>
         IPv6 source address taken from the IP packet header of a
         packet of this flow.
         </paragraph>
       </description>
     </field>

     <field name="destinationAddressV6" dataType="ipv6Address"
            fieldType="28" applicability="all" status="current">
       <description>
         <paragraph>
         IPv6 destination address taken from the IP packet header of a
         packet of this flow.
         </paragraph>
       </description>
     </field>

     <field name="sourceMaskV6" dataType="octet"
            fieldType="29" applicability="option" status="current">
       <description>
         <paragraph>
         The number of contiguous bits that are relevant in the
         sourceAddressV6 field.
         </paragraph>
       </description>
       <units>bits</units>
       <range>0-128</range>
     </field>

     <field name="destinationMaskV6" dataType="octet"



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            fieldType="30" applicability="option" status="current">
       <description>
         <paragraph>
         The number of contiguous bits that are relevant in the
         destinationAddressV6 field.
         </paragraph>
       </description>
       <units>bits</units>
       <range>0-128</range>
     </field>

     <field name="flowLabelV6" dataType="unsigned32"
            fieldType="31" applicability="all" status="current">
       <description>
         <paragraph>
         The Flow Label of the IPv6 packet header observed in a packet
         of this flow.
         </paragraph>
       </description>
       <reference>
         See RFC 2460 for a definition of the flow label field in the
         IPv6 packet header.
       </reference>
     </field>

     <field name="icmpTypeCode" dataType="unsigned16"
            fieldType="32" applicability="all" status="current">
       <description>
         <paragraph>
         Type and Code of the 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 ICMP type and code fields.
       </reference>
     </field>

     <field name="igmpType" dataType="octet"
            fieldType="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>




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     <field name="flowActiveTimeOut" dataType="unsigned16"
            fieldType="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"
            fieldType="37" applicability="all" status="current">
       <description>
         <paragraph>
          A flow is considered to be timed out if not packet belonging
          to the flow has been observed for the number of seconds
          specified by this field.
         </paragraph>
       </description>
       <units>seconds</units>
     </field>

     <field name="exportedOctetCount" dataType="unsigned64"
            fieldType="40" applicability="data" status="current">
       <description>
         <paragraph>
         The number of all octets reported by the exporting process
         to this collecting process.
         </paragraph>
       </description>
       <units>octets</units>
     </field>

     <field name="exportedPacketCount" dataType="unsigned64"
            fieldType="41" applicability="data" status="current">
       <description>
         <paragraph>
         The number of all packets reported by the exporting process
         to this collecting process.
         </paragraph>
       </description>
       <units>packets</units>
     </field>

     <field name="exportedFlowCount" dataType="unsigned64"
            fieldType="42" applicability="data" status="current">
       <description>



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         <paragraph>
         The number of all flows records reported by the exporting
         process to this collecting process.
         </paragraph>
       </description>
       <units>flows</units>
     </field>

     <field name="sourcePrefixV4" dataType="ipV4Address"
            fieldType="44" applicability="data" status="current">
       <description>
         <paragraph> IPv4 source address prefix. </paragraph>
         <paragraph>
         EDITOR'S NOTE: to be discussed on ipfix mailing list
         </paragraph>
       </description>
       <units>flows</units>
     </field>

     <field name="destinationPrefixV4" dataType="ipV4Address"
            fieldType="45" applicability="data" status="current">
       <description>
         <paragraph> IPv4 destination address prefix. </paragraph>
         <paragraph>
         EDITOR'S NOTE: to be discussed on ipfix mailing list
         </paragraph>
       </description>
       <units>flows</units>
     </field>

     <field name="mplsTopLabelType" dataType="octet"
            dataTypeSemantics="identifier"
            fieldType="46" applicability="data" status="current">
       <description>
         <paragraph>
         MPLS top label type:
         <list>
         <item> 0x01 TE-MIDPT: Any TE tunnel mid-point or tail label</item>
         <item> 0x02 Pseudowire: Any PWE3 or Cisco AToM based label</item>
         <item> 0x03 VPN: Any label associated with VPN</item>
         <item> 0x04 BGP: Any label associated with BGP or BGP routing</item>
         <item> 0x05 LDP: Any label associated with dynamically assigned
                labels using LDP</item>
         </list>
         This field identifies the control protocol that allocated the
         top of stack label.
         </paragraph>
       </description>



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     </field>

     <field name="mplsTopLabelIPAddressV4" dataType="ipV4Address"
            fieldType="47" applicability="data" status="current">
       <description>
         <paragraph>
           The IPv4 address of the system that the MPLS top label will
           cause this packet to be forwarded to.
         </paragraph>
       </description>
     </field>

     <field name="minimumTTL" dataType="octet"
            fieldType="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"
            fieldType="53" applicability="data" status="current">
       <description>
         <paragraph>
           Maximum TTL value observed for any packet in this flow.
         </paragraph>
       </description>
     </field>

     <field name="identificationV4" dataType="octet"
            dataTypeSemantics="identifier"
            fieldType="54" applicability="data" status="current">
       <description>
         <paragraph>
           Packet identification field from the first IP packet of this flow.
         </paragraph>
       </description>
       <reference>
         See RFC 791 for the definition of the IPv4 identification field.
       </reference>
     </field>

     <field name="sourceMacAddress" dataType="octet"
            fieldType="56" applicability="data" status="current">
       <description>
         <paragraph>
           Packet identification field from the first IP packet of this flow.



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         </paragraph>
       </description>
       <reference>
         See RFC 791 for the definition of the IPv4 identification field.
       </reference>
     </field>

     <field name="ipVersion" dataType="octet"
            fieldType="60" applicability="all" status="current">
       <description>
         The IP version field given in the IP header.
       </description>
       <units>flows</units>
       <reference>
         <paragraph>
         See RFC 791 for a definition of the version field in the
         IPv6 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="ipNextHopAddressV6" dataType="ipv6Address"
            fieldType="62" applicability="data" status="current">
       <description>
         <paragraph>
         The IPv6 address of the next BGP hop to which packets of
         this flow are forwarded.
         </paragraph>
       </description>
     </field>

     <field name="bgpNextHopAddressV6" dataType="ipv6Address"
            dataTypeSemantics="identifier"
            fieldType="63" applicability="all" status="current">
       <description>
         <paragraph>
         The IPv6 address of the next BGP hop to which packets of
         this flow are forwarded.
         </paragraph>
       </description>
       <reference>
         See RFC 1771 for a description of BGB-4.
         See RFC 1930 a definition of the AS number.



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       </reference>
     </field>

     <field name="ipv6OptionHeaders" dataType="unsigned32"
            dataTypeSemantics="flags"
            fieldType="64" applicability="all" status="current">
       <description>
         <paragraph>
         IPv6 options in the IP packet headers of this flow.
         This is encoded as a bit field.
         </paragraph>
         <paragraph> to be replaced by ASCII drawing </paragraph>
         <paragraph> to be replaced by ASCII drawing </paragraph>
         <paragraph> to be replaced by ASCII drawing </paragraph>
         <paragraph> to be replaced by ASCII drawing </paragraph>
         <paragraph> to be replaced by ASCII drawing </paragraph>
         <paragraph> to be replaced by ASCII drawing </paragraph>
         <paragraph> to be replaced by ASCII drawing </paragraph>
         <paragraph> to be replaced by ASCII drawing </paragraph>
         <paragraph> to be replaced by ASCII drawing </paragraph>
         <paragraph> to be replaced by ASCII drawing </paragraph>
         <paragraph> to be replaced by ASCII drawing </paragraph>
       </description>
       <reference>
         To be done.
       </reference>
     </field>

     <field name="partialMPLSLabelStackEntry1" dataType="unsigned32"
            fieldType="70" applicability="all" status="current">
       <description>
         <paragraph>
         The label, exp and s fields from the outermost MPLS label
         stack entry e.g. the last label that was pushed last.
         </paragraph>
         <paragraph> to be replaced by ASCII drawing </paragraph>
         <paragraph> to be replaced by ASCII drawing </paragraph>
         <paragraph> to be replaced by ASCII drawing </paragraph>
         <paragraph> to be replaced by ASCII drawing </paragraph>
         <paragraph> to be replaced by ASCII drawing </paragraph>
       </description>
       <reference>
         See RFC 3032.
       </reference>
     </field>

     <field name="partialMPLSLabelStackEntry2" dataType="unsigned32"
            fieldType="71" applicability="all" status="current">



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       <description>
         <paragraph>
         The label, exp and s fields from the LSE that was pushed
         immediately before the LSE that would be reported by
         partialMplsLse1. See the definition of partialMplsLse1 for
         further details.
         </paragraph>
       </description>
       <reference>
         See RFC 3032.
       </reference>
     </field>

     <field name="partialMPLSLabelStackEntry3" dataType="unsigned32"
            fieldType="72" applicability="all" status="current">
       <description>
         <paragraph>
         The label, exp and s fields from the LSE that was pushed
         immediately before the LSE that would be reported by
         partialMplsLse2. See the definition of partialMplsLse1 for
         further details.
         </paragraph>
       </description>
       <reference>
         See RFC 3032.
       </reference>
     </field>

     <field name="partialMPLSLabelStackEntry4" dataType="unsigned32"
            fieldType="73" applicability="all" status="current">
       <description>
         <paragraph>
         The label, exp and s fields from the LSE that was pushed
         immediately before the LSE that would be reported by
         partialMplsLse3. See the definition of partialMplsLse1 for
         further details.
         </paragraph>
       </description>
       <reference>
         See RFC 3032.
       </reference>
     </field>

     <field name="partialMPLSLabelStackEntry5" dataType="unsigned32"
            fieldType="74" applicability="all" status="current">
       <description>
         <paragraph>
         The label, exp and s fields from the LSE that was pushed



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         immediately before the LSE that would be reported by
         partialMplsLse4. See the definition of partialMplsLse1 for
         further details.
         </paragraph>
       </description>
       <reference>
         See RFC 3032.
       </reference>
     </field>

     <field name="partialMPLSLabelStackEntry6" dataType="unsigned32"
            fieldType="75" applicability="all" status="current">
       <description>
         <paragraph>
         The label, exp and s fields from the LSE that was pushed
         immediately before the LSE that would be reported by
         partialMplsLse5. See the definition of partialMplsLse1 for
         further details.
         </paragraph>
       </description>
       <reference>
         See RFC 3032.
       </reference>
     </field>

     <field name="partialMPLSLabelStackEntry7" dataType="unsigned32"
            fieldType="76" applicability="all" status="current">
       <description>
         <paragraph>
         The label, exp and s fields from the LSE that was pushed
         immediately before the LSE that would be reported by
         partialMplsLse6. See the definition of partialMplsLse1 for
         further details.
         </paragraph>
       </description>
       <reference>
         See RFC 3032.
       </reference>
     </field>

     <field name="partialMPLSLabelStackEntry8" dataType="unsigned32"
            fieldType="77" applicability="all" status="current">
       <description>
         <paragraph>
         The label, exp and s fields from the LSE that was pushed
         immediately before the LSE that would be reported by
         partialMplsLse7. See the definition of partialMplsLse1 for
         further details.



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

     <field name="partialMPLSLabelStackEntry9" dataType="unsigned32"
            fieldType="78" applicability="all" status="current">
       <description>
         <paragraph>
         The label, exp and s fields from the LSE that was pushed
         immediately before the LSE that would be reported by
         partialMplsLse8. See the definition of partialMplsLse1 for
         further details.
         </paragraph>
       </description>
       <reference>
         See RFC 3032.
       </reference>
     </field>

     <field name="partialMPLSLabelStackEntry10" dataType="unsigned32"
            fieldType="79" applicability="all" status="current">
       <description>
         <paragraph>
         The label, exp and s fields from the LSE that was pushed
         immediately before the LSE that would be reported by
         partialMplsLse9. See the definition of partialMplsLse1 for
         further details.
         </paragraph>
       </description>
       <reference>
         See RFC 3032.
       </reference>
     </field>

     <field name="runningOctetCounter" dataType="unsigned64"
            dataTypeSemantics="runningCounter"
            fieldType="85" applicability="all" status="current">
       <description>
         <paragraph>
         Number of observed octets for a pre-defined permanent flow.
         </paragraph>
         <paragraph>
         EDITOR'S NOTE: clarification required.
         </paragraph>
       </description>



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       <units>octets</units>
     </field>

     <field name="runningPacketCounter" dataType="unsigned64"
            dataTypeSemantics="runningCounter"
            fieldType="86" applicability="all" status="current">
       <description>
         <paragraph>
         Number of observed packets for a pre-defined permanent flow.
         </paragraph>
         <paragraph>
         EDITOR'S NOTE: clarification required.
         </paragraph>
       </description>
       <units>packets</units>
     </field>

     <field name="bgpNextHopAsNumber" dataType="unsigned16"
            dataTypeSemantics="identifier"
            fieldType="128" applicability="all" status="current">
       <description>
         <paragraph>
         The autonomous system (AS) number of the next BGP hop to
         which packets of this flow are forwarded.
         </paragraph>
       </description>
       <reference>
         See RFC 1771 for a description of BGB-4 and
         see RFC 1930 a definition of the AS number.
       </reference>
     </field>

     <field name="ipNextHopAsNumber" dataType="unsigned16"
            dataTypeSemantics="identifier"
            fieldType="129" applicability="all" status="current">
       <description>
         <paragraph>
         The autonomous system (AS) number of the next IP hop to
         which packets of this flow are forwarded.
         </paragraph>
       </description>
       <reference>
         See RFC 1771 for a description of BGB-4 and
         see RFC 1930 a definition of the AS number.
       </reference>
     </field>

     <field name="exporterAddressV4" dataType="ipv4Address"



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            dataTypeSemantics="identifier"
            fieldType="130" applicability="all" status="current">
       <description>
         <paragraph>
         The IPv4 address of the 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="exporterAddressV6" dataType="ipv6Address"
            dataTypeSemantics="identifier"
            fieldType="131" applicability="all" status="current">
       <description>
         <paragraph>
         The IPv6 address of the 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="droppedOctetDeltaCount" dataType="unsigned64"
            dataTypeSemantics="deltaCounter"
            fieldType="132" applicability="data" status="current">
       <description>
         <paragraph>
         The number of octets in packets of this flow dropped by packet treatment.
         </paragraph>
       </description>
       <units>octets</units>
     </field>

     <field name="droppedPacketDeltaCount" dataType="unsigned64"
            dataTypeSemantics="deltaCounter"
            fieldType="133" applicability="data" status="current">
       <description>
         <paragraph>
         The number of packets of this flow dropped by packet treatment.
         </paragraph>
       </description>
       <units>packets</units>
     </field>

     <field name="droppedOctetTotalCount" dataType="unsigned64"



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            dataTypeSemantics="runningCounter"
            fieldType="134" applicability="data" status="current">
       <description>
         <paragraph>
         The number of octets in packets of this flow dropped by packet treatment.
         </paragraph>
       </description>
       <units>octets</units>
     </field>

     <field name="droppedPacketTotalCount" dataType="unsigned64"
            dataTypeSemantics="runningCounter"
            fieldType="135" applicability="data" status="current">
       <description>
         <paragraph>
         The number of packets of this flow dropped by packet treatment.
         </paragraph>
       </description>
       <units>packets</units>
     </field>

     <field name="flowEndReason" dataType="octet"
            fieldType="136" applicability="data" status="current">
       <description>
         <paragraph>
         The reason for flow termination.
         <list>
           <item>idle timeout</item>
           <item>end of flow detected (e.g. TCP FIN)</item>
           <item>forced end</item>
           <item>cache full</item>
         </list>
         EDITORS' NOTE: This needs to be defined as an
         enumerated range.
         </paragraph>
       </description>
     </field>

     <field name="classOfServiceV6" dataType="octet"
            fieldType="135" applicability="data" status="current">
       <description>
         <paragraph>
         The value of the IPv6 traffic class field observed
         for packets of this flow.
         </paragraph>
       </description>
       <reference>
         See RFC 2460 for the definition of the IPv6 traffic class field.



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       </reference>
     </field>

   </fieldDefinitions>















































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Appendix B. Formal Specification of Abstract Data Types

   This appendix containfs a formal description of the abstract data
   types to be used for IPFIX fields and a formal description of the
   template used for defining IPFIX fields.  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"?>
   <schema elementFormDefault="qualified"
           targetNamespace="http://www.ietf.org/ipfix"
           xmlns:ipfix="http://www.ietf.org/ipfix">

     <simpleType name="dataType">
       <restriction base="string">
         <enumeration value="octet">
           <annotation>
             <documentation>The type "unsignedByte" 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>



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         </enumeration>

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

         <enumeration value="boolean">
           <annotation>
             <documentation>The type "boolean" represents a binary
               value.
             </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.  Unicode allows for ASCII 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 USASCII
               characters, but also accomodates other Unicode
               multibyte characters.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="dateTimeSeconds">
           <annotation>
             <documentation>
               The type "dateTimeSeconds" represents a time value
               having a precision of seconds and normalized to the
               GMT timezone.  Such types are in common use on many
               operating systems and have the advantage that they



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               can be stored in 32-bit integers.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="dataTimeMicroSeconds">
           <annotation>
             <documentation>The type "dateTimeSeconds" represents a
               time value having a precision of microseconds and
               normalized to the GMT timezone.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="ipv4Address">
           <annotation>
             <documentation>The type "ipv4Addr" represents a value of
               an IPv4 address. These addresses are typically stored
               as 32-bit integers.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="ipv6Address">
           <annotation>
             <documentation>The type "ipv6Addr" represents a value
               of an IPv6 address.
             </documentation>
           </annotation>
         </enumeration>
       </restriction>
     </simpleType>

     <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 integral fields should behave as a quantity.
             </documentation>
           </annotation>
         </enumeration>




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         <enumeration value="counter">
           <annotation>
             <documentation>
               A measurement which is ongoing from the perspective
               of the exporter.  Basically the same semantics as
               counters in SNMP.  Counters are unsigned and wrap back
               to zero after reaching the limit of the type. E.g. 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.
             </documentation>
           </annotation>
         </enumeration>

         <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. E.g. 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 fields that are applicable to flow records
               only.
             </documentation>



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           </annotation>
         </enumeration>

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

         <enumeration value="all">
           <annotation>
             <documentation>
               Used for fields 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 field definition is that the
               definition is current and valid.
             </documentation>
           </annotation>
         </enumeration>

         <enumeration value="deprecated">
           <annotation>
             <documentation>
               Indicates that the field 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>



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               Indicates that the field 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>

     <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>



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           <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 field is derived from the
                       flow or other information available to the
                       observer.
                     </documentation>
                   </annotation>
                 </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 field 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



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                       identifiers associated with a set of discrete
                       values this 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>
                     <documentation>
                       Some 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 field. The
                     preferred spelling for the name is to use mixed
                     case if the name is compound, with an initial
                     lower case letter. (E.g. "sourceIpAddress").
                   </documentation>
                 </annotation>
               </attribute>

               <attribute name="dataType" type="ipfix:dataType"
                          use="required">
                 <annotation>
                   <documentation>
                     One of the types listed in the "Type Space"
                     section.  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 IPAddress) which are common to this
                     domain and useful to distinguish.
                   </documentation>
                 </annotation>
               </attribute>



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               <attribute name="dataTypeSemantics"
                          type="ipfix:dataTypeSemantics" use="optional">
                 <annotation>
                   <documentation>
                     The integral types may be qualified by additional
                     semantic details. Qualifying the fields as
                     'quantity', 'counter', 'identifier' or 'flags'.
                   </documentation>
                 </annotation>
               </attribute>

               <attribute name="fieldType" type="nonNegativeInteger"
                          use="required">
                 <annotation>
                   <documentation>
                     A numeric identifier administered by IANA.
                     This is used for compact identification of an
                     information item when encoding templates in the
                     protocol.
                   </documentation>
                 </annotation>
               </attribute>

               <attribute name="vendorId" type="nonNegativeInteger"
                          use="optional">
                 <annotation>
                   <documentation>
                     When extension is done outside of the scope of
                     the IANA IPFIX fieldId range, a vendorId MUST
                     be provided.  This identifier is based on IANA
                     assigned enterprise identifiers.
                   </documentation>
                 </annotation>
               </attribute>

               <attribute name="applicability"
                          type="ipfix:applicability" use="required">
                 <annotation>
                   <documentation>to be done ...</documentation>
                 </annotation>
               </attribute>

               <attribute name="status" type="ipfix:status"
                          use="required">
                 <annotation>
                   <documentation>to be done ...</documentation>
                 </annotation>
               </attribute>



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

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

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







































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Intellectual Property Statement

   The IETF takes no position regarding the validity or scope of any
   intellectual property or other rights that might be claimed to
   pertain to the implementation or use of the technology described in
   this document or the extent to which any license under such rights
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   The IETF invites any interested party to bring to its attention any
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   this standard. Please address the information to the IETF Executive
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Full Copyright Statement

   Copyright (C) The Internet Society (2004). All Rights Reserved.

   This document and translations of it may be copied and furnished to
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   The limited permissions granted above are perpetual and will not be
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   TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
   BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION



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   HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.


Acknowledgment

   Funding for the RFC Editor function is currently provided by the
   Internet Society.











































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