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Versions: 00 01 02 03 04 05 06 RFC 6727

Network Working Group                                      T. Dietz, Ed.
Internet-Draft                                           NEC Europe Ltd.
Intended status: Standards Track                               B. Claise
Expires: September 3, 2011                           Cisco Systems, Inc.
                                                              J. Quittek
                                                         NEC Europe Ltd.
                                                           March 2, 2011


           Definitions of Managed Objects for Packet Sampling
                  <draft-ietf-ipfix-psamp-mib-03.txt>

Abstract

   This memo defines a portion of the Management Information Base (MIB)
   for use with network management protocols in the Internet community.
   In particular, it describes extensions to the IPFIX MIB module
   [RFC5815].  For IPFIX implementations that use packet Sampling
   (PSAMP) techniques as described in [RFC5475], this memo defines the
   PSAMP MIB module containing managed objects for providing information
   on applied packet selection functions and their parameters.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   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."

   This Internet-Draft will expire on September 3, 2011.

Copyright Notice

   Copyright (c) 2011 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents



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   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.


Table of Contents

   1.  The Internet-Standard Management Framework . . . . . . . . . .  3

   2.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3

   3.  PSAMP Documents Overview . . . . . . . . . . . . . . . . . . .  4

   4.  Related IPFIX Documents  . . . . . . . . . . . . . . . . . . .  4

   5.  Structure of the PSAMP MIB module  . . . . . . . . . . . . . .  4
     5.1.  Textual Conventions  . . . . . . . . . . . . . . . . . . .  5
     5.2.  Packet Selection Functions . . . . . . . . . . . . . . . .  5
       5.2.1.  Systematic Count-based Sampling  . . . . . . . . . . .  6
       5.2.2.  Systematic Time-based Sampling . . . . . . . . . . . .  6
       5.2.3.  Random n-out-of-N Sampling . . . . . . . . . . . . . .  7
       5.2.4.  Uniform Probabilistic Sampling . . . . . . . . . . . .  7
       5.2.5.  Property Match Filtering . . . . . . . . . . . . . . .  7
       5.2.6.  Hash-based Filtering . . . . . . . . . . . . . . . . .  8

   6.  Definitions  . . . . . . . . . . . . . . . . . . . . . . . . .  8

   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 24

   8.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 25

   9.  Acknowledgment . . . . . . . . . . . . . . . . . . . . . . . . 26

   10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 26
     10.1. Normative References . . . . . . . . . . . . . . . . . . . 26
     10.2. Informative References . . . . . . . . . . . . . . . . . . 27

   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 27











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1.  The Internet-Standard Management Framework

   For a detailed overview of the documents that describe the current
   Internet-Standard Management Framework, please refer to section 7 of
   RFC 3410 [RFC3410].

   Managed objects are accessed via a virtual information store, termed
   the Management Information Base or MIB.  MIB objects are generally
   accessed through the Simple Network Management Protocol (SNMP).
   Objects in the MIB are defined using the mechanisms defined in the
   Structure of Management Information (SMI).  This memo specifies MIB
   modules that is compliant to the SMIv2, which is described in STD 58,
   RFC 2578 [RFC2578], STD 58, RFC 2579 [RFC2579] and STD 58,RFC 2580
   [RFC2580].


2.  Introduction

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in RFC
   2119 [RFC2119].

   This document is a product of the IP Flow Information eXport (IPFIX)
   working group.  Work on this document was started in the Packet
   Sampling (PSAMP) Working Group (WG) and moved to the IPFIX WG when
   the PSAMP WG was concluded.

   Its purpose is to define managed objects for monitoring PSAMP Devices
   performing packet selection by Sampling and Filtering as described in
   [RFC5475].

   It is assumed that packet Sampling is performed according to the
   framework defined in [RFC5474].

   Managed objects in the PSAMP MIB module are defined as an extension
   of the IPFIX MIB and IPFIX SELECTOR MIB modules [RFC5815].  Since the
   IPFIX MIB module is only for monitoring the same holds true for the
   PSAMP MIB module defined in this document.  The definition of objects
   is in line with the PSAMP information model [RFC5477].

   Section 3 gives an overview of the PSAMP documents, while section 4
   refers to the related IPFIX documents.  Section 5 describes the
   structure of the PSAMP MIB module and section 6 contains the formal
   definition.  Security issues are discussed in section 7.






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3.  PSAMP Documents Overview

   [RFC5474]: "A Framework for Packet Selection and Reporting" describes
   the PSAMP framework for network elements to select subsets of packets
   by statistical and other methods, and to export a stream of reports
   on the selected packets to a Collector.

   [RFC5475]: "Sampling and Filtering Techniques for IP Packet
   Selection" describes the set of packet selection techniques supported
   by PSAMP.

   [RFC5476]: "Packet Sampling (PSAMP) Protocol Specifications"
   specifies the export of packet information from a PSAMP Exporting
   Process to a PSAMP Collecting Process.

   [RFC5477]: "Information Model for Packet Sampling Exports" defines an
   information and data model for PSAMP.

   This document: "Definitions of Managed Objects for Packet Sampling"
   describes the PSAMP Management Information Base.


4.  Related IPFIX Documents

   The IPFIX protocol provides network administrators with access to IP
   Flow information.  The protocol document [RFC5101] specifies how
   IPFIX Data Records and Templates are carried via a congestion-aware
   transport protocol from IPFIX Exporting Processes to IPFIX Collecting
   Processes.  [RFC5101] also specifies the data types used in the PSAMP
   MIB module and their encoding.  The IPFIX MIB [RFC5815] is the basis
   for this document because it extends the IPFIX SELECTOR MIB defined
   there.


5.  Structure of the PSAMP MIB module

   The IPFIX MIB module defined in [RFC5815] has the concept of a packet
   Selection Process containing a set of Selector function instances.
   Selection Processes and functions are referenced in the
   ipfixSelectionProcessTable of the IPFIX MIB module.  The
   ipfixSelectionProcessTable identifies an instance of a Selector
   function by an OID.  The OID points to an object that describes the
   Selector function.  For simple Selector functions without parameters,
   the OID refers to an object which contains only one additional object
   indicating the current availability of the function.  For functions
   which have one or more parameters the object has a subtree that in
   addition to an availability object contains a table with a conceptual
   column for each parameter.  Entries (conceptual rows) in this table



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   represent different combinations of parameter values for instances of
   the Selector function.

   The object ipfixSelectorFunctions in the IPFIX SELECTOR MIB module
   serves as the root for objects that describe instances of packet
   Selector functions.  The IPFIX SELECTOR MIB is a very small module
   which is defined in [RFC5815].  Objects under ipfixSelectorFunctions
   are maintained by IANA.  In the IPFIX SELECTOR module as defiend by
   [RFC5815] the object ipfixSelectorFunctions contains just a single
   trivial packet Selector function called ipfixFuncSelectAll that
   selects every packet and has no parameter:

   ipfixSelectorMIB
   +- ipfixSelectorObjects(1)
      +- ipfixSelectorFunctions(1)
         +- ipfixFuncSelectAll(1)
            +- ipfixFuncSelectAllAvail(1)

   The PSAMP MIB module extends the IPFIX SELECTOR MIB according to the
   procedures defined in [RFC5815].  It introduces six new objects under
   ipfixSelectorFunctions.  Each of them describes a packet Selector
   function with one or more parameters.  Naming and ordering of objects
   is fully in line with the guidelines given in section 6.1 of
   [RFC5815].  All functions and their parameters are already listed in
   the overview of functions given by the table in section 8.2.1 of
   [RFC5477].

5.1.  Textual Conventions

   The PSAMP MIB module imports two textual conventions which define
   data types used in this MIB from other MIB modules.  The Unsigned64TC
   data type is imported from the APPLICATION MIB [RFC2564] and the
   Float64TC data type is imported from the FLOAT-TC-MIB
   [I-D.ietf-opsawg-mib-floats].  Those data types are defined according
   to [RFC5101].  Those data types are not an integral part of [RFC2578]
   but are needed to define objects in this MIB module that conform to
   the Information Elements defined for those objects in [RFC5477].

   The Unsigned64TC textual convention describes an unsigned integer of
   64 bits.  It is imported from the APPLICATION MIB.  The Float64TC
   textual convention describes the format that is used for 64 bit
   floating point numbers.

5.2.  Packet Selection Functions

   In general, different packet Selector functions have different
   parameters.  The PSAMP MIB module contains six objects with subtrees
   that provide information on parameters of function instances of



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   different Selector functions.  All objects are named and structured
   according to section 8.2.1 of [RFC5477]:

   ipfixSelectorFunctions(1)
   +-- psampSampCountBased(2)
   +- -psampSampTimeBased(3)
   +-- psampSampRandOutOfN(4)
   +-- psampSampUniProb(5)
   +-- psampFiltPropMatch(6)
   +-- psampFiltHash(7)

   Indexing of these functions in the PSAMP MIB module starts with index
   (2).  The function ipfixFuncSelectAll with index (1) is already
   defined in the IPFIX SELECTOR MIB module as shown above.

   The object tree for each of these functions is described below.
   Semantics of all functions and their parameters are described in
   detail in [RFC5475].  More information on the Selector Reports can
   also be found in section 6.5.2 of [RFC5476].

5.2.1.  Systematic Count-based Sampling

   The first Selector function is systematic count-based Sampling.  Its
   availability is indicated by object psampSampCountBasedAvail.  The
   function has two parameters: psampSampCountBasedInterval and
   psampSampCountBasedSpace.  Different combination of values of these
   parameters for different instances of the Selector function are
   represented by different conceptual rows in table
   psampSampCountBasedParamSetEntry:

   psampSampCountBased(2)
   +-- psampSampCountBasedAvail(1)
   +-- psampSampCountBasedParamSetTable(2)
      +-- psampSampCountBasedParamSetEntry(1) [psampSampCountBasedIndex]
         +-- psampSampCountBasedIndex(1)
         +-- psampSampCountBasedInterval(2)
         +-- psampSampCountBasedSpace(3)

5.2.2.  Systematic Time-based Sampling

   The second Selector function is systematic time-based Sampling.  The
   structure of the sub-tree for this function is similar to the
   psampSampCountBased sub-tree.  Parameters are
   psampSampTimeBasedInterval and psampSampTimeBasedSpace.  They appear
   to be the same as for count based Sampling, but their data types are
   different because they indicate time values instead of numbers of
   packets:




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   psampSampTimeBased(3)
   +-- psampSampTimeBasedAvail(1)
   +-- psampSampTimeBasedParamSetTable(2)
      +-- psampSampTimeBasedParamSetEntry(1) [psampSampTimeBasedIndex]
         +-- psampSampTimeBasedIndex(1)
         +-- psampSampTimeBasedInterval(2)
         +-- psampSampTimeBasedSpace(3)

5.2.3.  Random n-out-of-N Sampling

   The third Selector function is random n-out-of-N Sampling.
   Parameters are psampSampRandOutOfNSize and
   psampSampRandOutOfNPopulation:

   psampSampRandOutOfN(4)
   +-- psampSampRandOutOfNAvail(1)
   +-- psampSampRandOutOfNParamSetTable(2)
      +-- psampSampRandOutOfNParamSetEntry(1) [psampSampRandOutOfNIndex]
         +-- psampSampRandOutOfNIndex(1)
         +-- psampSampRandOutOfNSize(2)
         +-- psampSampRandOutOfNPopulation(3)

5.2.4.  Uniform Probabilistic Sampling

   The fourth Selector function is uniform probabilistic Sampling.  It
   has just a single parameter called psampSampUniProbProbability:

   psampSampUniProb(5)
   +-- psampSampUniProbAvail(1)
   +-- psampSampUniProbParamSetTable(2)
      +-- psampSampUniProbParamSetEntry(1) [psampSampUniProbIndex]
         +-- psampSampUniProbIndex(1)
         +-- psampSampUniProbProbability(2)

5.2.5.  Property Match Filtering

   The fifth Selector function is property match Filtering.  For this
   Selector function there is a broad variety of possible parameters
   that could be used.  But as stated in section 8.2.1 of [RFC5477]
   there are no agreed parameters specified and the sub-tree for this
   function only contains an object indicating the availability of this
   function.  Parameters cannot be retrieved via the PSAMP MIB module:

   psampFiltPropMatch(6)
   +-- psampFiltPropMatchAvail(1)






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5.2.6.  Hash-based Filtering

   The sixth Selector function is hash-based Filtering.  The object
   psampFiltHashFunction is an enumeration that specifies the kind of
   hash function that is applied.  These hash function have quite a
   number of parameters and the actual number may vary with the choice
   of the hash function applied.  The common parameter set for all hash-
   based Filtering functions contains 7 parameters:
   psampFiltHashInitializerValue, psampFiltHashIpPayloadOffset,
   psampFiltHashIpPayloadSize, psampFiltHashSelectedRangeMin,
   psampFiltHashSelectedRangeMax, psampFiltHashOutputRangeMin, and
   psampFiltHashOutputRangeMax.

   psampFiltHash(7)
   +-- psampFiltHashAvail(1)
   +-- psampFiltHashCapabilities(2)
   +-- psampFiltHashParamSetTable(3)
      +-- psampFiltHashParamSetEntry(1) [psampFiltHashIndex]
         +-- psampFiltHashIndex(1)
         +-- psampFiltHashFunction(2)
         +-- psampFiltHashInitializerValue(3)
         +-- psampFiltHashIpPayloadOffset(4)
         +-- psampFiltHashIpPayloadSize(5)
         +-- psampFiltHashSelectedRangeMin(6)
         +-- psampFiltHashSelectedRangeMax(7)
         +-- psampFiltHashOutputRangeMin(8)
         +-- psampFiltHashOutputRangeMax(9)

   Further parameters depend on the applied hash function and are not
   specified within the PSAMP MIB module.


6.  Definitions


   PSAMP-MIB DEFINITIONS ::= BEGIN

   IMPORTS
       MODULE-IDENTITY, OBJECT-TYPE, Integer32, Unsigned32, mib-2
           FROM SNMPv2-SMI                  -- RFC2578
       TruthValue
           FROM SNMPv2-TC                   -- RFC2579
       MODULE-COMPLIANCE, OBJECT-GROUP
           FROM SNMPv2-CONF                 -- RFC2580
       Unsigned64TC
           FROM APPLICATION-MIB             -- RFC2564
       Float64TC
           FROM FLOAT-TC-MIB           -- draft-ietf-opsawg-mib-float



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       ipfixSelectorFunctions
           FROM IPFIX-SELECTOR-MIB;

   psampMIB MODULE-IDENTITY
       LAST-UPDATED "201103021200Z"         -- 02 March 2011
       ORGANIZATION "IETF IPFIX Working Group"
       CONTACT-INFO
           "WG charter:
             http://www.ietf.org/html.charters/ipfix-charter.html

           Mailing Lists:
             General Discussion: ipfix@ietf.org
             To Subscribe: http://www1.ietf.org/mailman/listinfo/ipfix
             Archive:
         http://www1.ietf.org/mail-archive/web/ipfix/current/index.html

           Editor:
             Thomas Dietz
             NEC Europe Ltd.
             NEC Laboratories Europe
             Network Research Division
             Kurfuersten-Anlage 36
             69115 Heidelberg
             Germany
             Phone: +49 6221 4342-128
             Email: Thomas.Dietz@nw.neclab.eu

             Benoit Claise
             Cisco Systems, Inc.
             De Kleetlaan 6a b1
             Degem 1831
             Belgium
             Phone:  +32 2 704 5622
             Email: bclaise@cisco.com

             Juergen Quittek
             NEC Europe Ltd.
             NEC Laboratories Europe
             Network Research Division
             Kurfuersten-Anlage 36
             69115 Heidelberg
             Germany
             Phone: +49 6221 4342-115
             Email: quittek@nw.neclab.eu"
           DESCRIPTION
           "The PSAMP MIB defines managed objects for packet sampling
           and filtering.
           These objects provide information about managed nodes



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           supporting packet sampling, including packet sampling
           capabilities, configuration and statistics.
           The PSAMP MIB module extends the IPFIX SELECTOR MIB
           according to the procedures defined in RFC5815.

           Copyright (c) 2011 IETF Trust and the persons identified as
           the document authors.  All rights reserved. This version
           of this MIB module is part of RFC yyyy; see the RFC itself
           for full legal notices"
   -- RFC Ed.: replace yyyy with actual RFC number & remove this notice

        --  Revision history

        REVISION     "201103021200Z"         -- 02 March 2011
        DESCRIPTION
            "Initial version, published as RFC yyyy."
   -- RFC Ed.: replace yyyy with actual RFC number & remove this notice

       ::= { mib-2 xxx }
   -- xxx to be assigned by IANA.

   -- Top level structure of the MIB

   psampObjects     OBJECT IDENTIFIER ::= { psampMIB 1 }
   psampConformance OBJECT IDENTIFIER ::= { psampMIB 2 }


   --==================================================================
   -- Packet selection sampling methods group of objects
   --==================================================================

   --==================================================================
   --* Method 1: Systematic count-based Sampling
   --==================================================================

   -- Reference: RFC5475, Section 5.1, RFC5476 Section 6.5.2.1 and
   --            RFC5477, Section 8.2
   psampSampCountBased OBJECT IDENTIFIER
       ::= { ipfixSelectorFunctions 2 }

   psampSampCountBasedAvail OBJECT-TYPE
       SYNTAX      TruthValue
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "This object indicates the availability of systematic
           count-based sampling at the managed node.




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           A Selector may be unavailable if it is implemented but
           currently disabled due to e.g., administrative reasons, lack
           of resources or similar."
       DEFVAL { false }
       ::= { psampSampCountBased 1 }

   -- Parameter Set Table +++++++++++++++++++++++++++++++++++++++++++++

   psampSampCountBasedParamSetTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF
                   PsampSampCountBasedParamSetEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "This table lists configurations of systematic count-based
           packet sampling.  A parameter set describing a
           configuration contains two parameters: the sampling
           interval length and space."
       ::= { psampSampCountBased 2 }

   psampSampCountBasedParamSetEntry OBJECT-TYPE
       SYNTAX      PsampSampCountBasedParamSetEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "Defines an entry in the psampSampCountBasedParamSetTable."
       INDEX { psampSampCountBasedIndex }
       ::= { psampSampCountBasedParamSetTable 1 }

   PsampSampCountBasedParamSetEntry ::=
       SEQUENCE {
           psampSampCountBasedIndex     Integer32,
           psampSampCountBasedInterval  Unsigned32,
           psampSampCountBasedSpace     Unsigned32
       }

   psampSampCountBasedIndex OBJECT-TYPE
       SYNTAX      Integer32 (1..2147483647)
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "The index of this parameter set in the
           psampSampCountBasedParamSetTable. It is used in the
           object ipfixSelectionProcessSelectorFunctionentries of
           the ipfixSelectionProcessTable in the IPFIX-MIB as reference
           to this parameter set."
       ::= { psampSampCountBasedParamSetEntry 1 }




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   psampSampCountBasedInterval OBJECT-TYPE
       SYNTAX      Unsigned32
       UNITS       "packets"
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "This object specifies the number of packets that are
           consecutively sampled.  A value of 100 means that 100
           consecutive packets are sampled."
       REFERENCE
           "RFC5475, Section 5.1 and RFC5477, Section 8.2"
       ::= { psampSampCountBasedParamSetEntry 2 }

   psampSampCountBasedSpace OBJECT-TYPE
       SYNTAX      Unsigned32
       UNITS       "packets"
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "This object specifies the number of packets between two
           psampSampCountBasedInterval's.  A value of 100 means that
           the next interval starts 100 packets (which are not sampled)
           after the current psampSampCountBasedInterval is over."
       REFERENCE
           "RFC5475, Section 5.1 and RFC5477, Section 8.2"
       ::= { psampSampCountBasedParamSetEntry 3 }

   --==================================================================
   --* Method 2: Systematic time-based Sampling
   --==================================================================

   -- Reference: RFC5475, Section 5.1, RFC5476 Section 6.5.2.2 and
   --            RFC5477, Section 8.2
   psampSampTimeBased OBJECT IDENTIFIER
       ::= { ipfixSelectorFunctions 3 }

   psampSampTimeBasedAvail OBJECT-TYPE
       SYNTAX      TruthValue
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "This object indicates the availability of systematic
           time-based sampling at the managed node.

           A Selector may be unavailable if it is implemented but
           currently disabled due to e.g., administrative reasons, lack
           of resources or similar."
       DEFVAL { false }



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       ::= { psampSampTimeBased 1 }

   -- Parameter Set Table +++++++++++++++++++++++++++++++++++++++++++++

   psampSampTimeBasedParamSetTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF
                   PsampSampTimeBasedParamSetEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "This table lists configurations of systematic time-based
           packet sampling. A parameter set describing a configuration
           contains two parameters: the sampling interval length and
           the space."
       ::= { psampSampTimeBased 2 }

   psampSampTimeBasedParamSetEntry OBJECT-TYPE
       SYNTAX      PsampSampTimeBasedParamSetEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "Defines an entry in the psampSampTimeBasedParamSetTable."
       INDEX { psampSampTimeBasedIndex }
       ::= { psampSampTimeBasedParamSetTable 1 }

   PsampSampTimeBasedParamSetEntry ::=
       SEQUENCE {
           psampSampTimeBasedIndex     Integer32,
           psampSampTimeBasedInterval  Unsigned32,
           psampSampTimeBasedSpace     Unsigned32
       }

   psampSampTimeBasedIndex OBJECT-TYPE
       SYNTAX      Integer32 (1..2147483647)
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "The index of this parameter set in the
           psampSampTimeBasedParamSetTable. It is used in the
           object ipfixSelectionProcessSelectorFunctionentries of
           the ipfixSelectionProcessTable in the IPFIX-MIB as reference
           to this parameter set."
       ::= { psampSampTimeBasedParamSetEntry 1 }

   psampSampTimeBasedInterval OBJECT-TYPE
       SYNTAX      Unsigned32
       UNITS       "microseconds"
       MAX-ACCESS  read-only



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       STATUS      current
       DESCRIPTION
           "This object specifies the time interval in microseconds
           during which all arriving packets are sampled."
       REFERENCE
           "RFC5475, Section 5.1 and RFC5477, Section 8.2"
       ::= { psampSampTimeBasedParamSetEntry 2 }

   psampSampTimeBasedSpace OBJECT-TYPE
       SYNTAX      Unsigned32
       UNITS       "microseconds"
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "This object specifies the time interval in microseconds
           between two psampSampTimeBasedInterval's.  A value of 100
           means that the next interval starts 100 microseconds (during
           which no packets are sampled) after the current
           psampSampTimeBasedInterval is over."
       REFERENCE
           "RFC5475, Section 5.1 and RFC5477, Section 8.2"
       ::= { psampSampTimeBasedParamSetEntry 3 }

   --==================================================================
   --* Method 3: Random n-out-of-N Sampling
   --==================================================================

   -- Reference: RFC5475, Section 5.2.1, RFC5476 Section 6.5.2.3 and
   --            RFC5477, Section 8.2
   psampSampRandOutOfN OBJECT IDENTIFIER
       ::= { ipfixSelectorFunctions 4 }

   psampSampRandOutOfNAvail OBJECT-TYPE
       SYNTAX      TruthValue
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "This object indicates the availability of random n-out-of-N
           sampling at the managed node.

           A Selector may be unavailable if it is implemented but
           currently disabled due to e.g., administrative reasons, lack
           of resources or similar."
       DEFVAL { false }
       ::= { psampSampRandOutOfN 1 }

   -- Parameter Set Table +++++++++++++++++++++++++++++++++++++++++++++




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   psampSampRandOutOfNParamSetTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF
                   PsampSampRandOutOfNParamSetEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "This table lists configurations of random n-out-of-N
           sampling.  A parameter set describing a configuration
           contains two parameters, the sampling size and the
           parent population."
       ::= { psampSampRandOutOfN 2 }

   psampSampRandOutOfNParamSetEntry OBJECT-TYPE
       SYNTAX      PsampSampRandOutOfNParamSetEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "Defines an entry in the psampSampRandOutOfNParamSetTable."
       INDEX { psampSampRandOutOfNIndex }
       ::= { psampSampRandOutOfNParamSetTable 1 }

   PsampSampRandOutOfNParamSetEntry ::=
       SEQUENCE {
           psampSampRandOutOfNIndex        Integer32,
           psampSampRandOutOfNSize Unsigned32,
           psampSampRandOutOfNPopulation   Unsigned32
       }

   psampSampRandOutOfNIndex OBJECT-TYPE
       SYNTAX      Integer32 (1..2147483647)
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "The index of this parameter set in the
           psampSampRandOutOfNParamSetTable.  It is used in the
           object ipfixSelectionProcessSelectorFunctionentries of
           the ipfixSelectionProcessTable in the IPFIX-MIB as reference
           to this parameter set."
       ::= { psampSampRandOutOfNParamSetEntry 1 }

   psampSampRandOutOfNSize OBJECT-TYPE
       SYNTAX      Unsigned32
       UNITS       "packets"
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "This object specifies the number of elements taken from the
           parent Population specified in



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           psampSampRandOutOfNPopulation."
       REFERENCE
           "RFC5475, Section 5.2.1 and RFC5477, Section 8.2"
       ::= { psampSampRandOutOfNParamSetEntry 2 }

   psampSampRandOutOfNPopulation OBJECT-TYPE
       SYNTAX      Unsigned32
       UNITS       "packets"
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "This object specifies the number of elements in the parent
           Population."
       REFERENCE
           "RFC5475, Section 5.2.1 and RFC5477, Section 8.2"
       ::= { psampSampRandOutOfNParamSetEntry 3 }

   --==================================================================
   --* Method 4: Uniform probabilistic Sampling
   --==================================================================

   -- Reference: RFC5475, Section 5.2.2, RFC5476 Section 6.5.2.4 and
   --            RFC5477, Section 8.2
   psampSampUniProb OBJECT IDENTIFIER ::= { ipfixSelectorFunctions 5 }

   psampSampUniProbAvail OBJECT-TYPE
       SYNTAX      TruthValue
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "This object indicates the availability of random uniform
           probabilistic sampling at the managed node.

           A Selector may be unavailable if it is implemented but
           currently disabled due to e.g., administrative reasons, lack
           of resources or similar."
       DEFVAL { false }
       ::= { psampSampUniProb 1 }

   -- Parameter Set Table +++++++++++++++++++++++++++++++++++++++++++++

   -- Reference: RFC5475, Section 5.2.2.1 and RFC5477, Section 8.2
   psampSampUniProbParamSetTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF
                   PsampSampUniProbParamSetEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION



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           "This table lists configurations of random probabilistic
           sampling.  A parameter set describing a configuration
           contains a single parameter only: the sampling probability."
       ::= { psampSampUniProb 2 }

   psampSampUniProbParamSetEntry OBJECT-TYPE
       SYNTAX      PsampSampUniProbParamSetEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "Defines an entry in the psampSampUniProbParamSetTable."
       INDEX { psampSampUniProbIndex }
       ::= { psampSampUniProbParamSetTable 1 }

   PsampSampUniProbParamSetEntry ::=
       SEQUENCE {
           psampSampUniProbIndex       Integer32,
           psampSampUniProbProbability Float64TC
       }

   psampSampUniProbIndex OBJECT-TYPE
       SYNTAX      Integer32 (1..2147483647)
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "The index of this parameter set in the
           psampSampUniProbParamSetTable.  It is used in the
           object ipfixSelectionProcessSelectorFunctionentries of
           the ipfixSelectionProcessTable in the IPFIX-MIB as reference
           to this parameter set."
       ::= { psampSampUniProbParamSetEntry 1 }

   psampSampUniProbProbability OBJECT-TYPE
       SYNTAX      Float64TC
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "This object specifies the probability that a packet is
           sampled, expressed as a value between 0 and 1.  The
           probability is equal for every packet.  A value of 0 means
           no packet is sampled since the probability is 0. A value
           of 1 means all packets are sampled since the
           probability is 1."
       REFERENCE
           "RFC5475, Section 5.2.2.1 and RFC5477, Section 8.2"
       ::= { psampSampUniProbParamSetEntry 2 }

   --==================================================================



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   -- Packet selection filtering methods group of objects
   --==================================================================

   --==================================================================
   --* Method 5: Property Match filtering
   --==================================================================

   -- Reserves Method 5 (see RFC5475, Section 6.1, RFC5476
   -- Section 6.5.2.5 and RFC5477)
   psampFiltPropMatch OBJECT IDENTIFIER
       ::= { ipfixSelectorFunctions 6 }

   psampFiltPropMatchAvail OBJECT-TYPE
       SYNTAX      TruthValue
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "This object indicates the availability of property match
           filtering at the managed node.

           A Selector may be unavailable if it is implemented but
           currently disabled due to e.g., administrative reasons, lack
           of resources or similar."
       DEFVAL { false }
       ::= { psampFiltPropMatch 1 }

   --==================================================================
   --* Method 6: Hash filtering
   --==================================================================

   -- Reference: RFC5475, Section 6.2, RFC5476 Section 6.5.2.6 and
   --            RFC5477, Section 8.3
   psampFiltHash OBJECT IDENTIFIER ::= { ipfixSelectorFunctions 7 }

   psampFiltHashAvail OBJECT-TYPE
       SYNTAX      TruthValue
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "This object indicates the availability of hash filtering
           at the managed node.

           A Selector may be unavailable if it is implemented but
           currently disabled due to e.g., administrative reasons, lack
           of resources or similar."
       DEFVAL { false }
       ::= { psampFiltHash 1 }




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   psampFiltHashCapabilities OBJECT IDENTIFIER
       ::= { psampFiltHash 2 }

   -- Parameter Set Table +++++++++++++++++++++++++++++++++++++++++++++

   -- Reference: RFC5475, Sections 6.2, 3.8, and 7.1
   psampFiltHashParamSetTable OBJECT-TYPE
       SYNTAX      SEQUENCE OF
                   PsampFiltHashParamSetEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "This table lists configurations of hash filtering. A
           parameter set describing a configuration contains eight
           parameters describing the hash function."
       ::= { psampFiltHash 3 }

   psampFiltHashParamSetEntry OBJECT-TYPE
       SYNTAX      PsampFiltHashParamSetEntry
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "Defines an entry in the psampFiltHashParamSetTable."
       INDEX { psampFiltHashIndex }
       ::= { psampFiltHashParamSetTable 1 }

   PsampFiltHashParamSetEntry ::=
       SEQUENCE {
           psampFiltHashIndex            Integer32,
           psampFiltHashFunction         INTEGER,
           psampFiltHashInitializerValue Unsigned64TC,
           psampFiltHashIpPayloadOffset  Unsigned64TC,
           psampFiltHashIpPayloadSize    Unsigned64TC,
           psampFiltHashSelectedRangeMin Unsigned64TC,
           psampFiltHashSelectedRangeMax Unsigned64TC,
           psampFiltHashOutputRangeMin   Unsigned64TC,
           psampFiltHashOutputRangeMax   Unsigned64TC
       }

   psampFiltHashIndex OBJECT-TYPE
       SYNTAX      Integer32 (1..2147483647)
       MAX-ACCESS  not-accessible
       STATUS      current
       DESCRIPTION
           "The index of this parameter set in the
            psampFiltHashParamSetTable. It is used in the
           object ipfixSelectionProcessSelectorFunctionentries of
           the ipfixSelectionProcessTable in the IPFIX-MIB as reference



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           to this parameter set."
       ::= { psampFiltHashParamSetEntry 1 }

   psampFiltHashFunction OBJECT-TYPE
       SYNTAX      INTEGER {
                       crc32(1),
                       ipsx(2),
                       bob(3)
                   }
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "The Hash Function used by this filter. The PSAMP-MIB
           supports the following Hash Functions:

           crc32(1)

           ipsx(2)

           bob(3)
           "
       ::= { psampFiltHashParamSetEntry 2 }

   psampFiltHashInitializerValue OBJECT-TYPE
       SYNTAX      Unsigned64TC
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "This object specifies the initializer value to the hash
           function."
       REFERENCE
           "RFC5475, Sections 6.2, 3.8, and 7.1"
       ::= { psampFiltHashParamSetEntry 3 }

   psampFiltHashIpPayloadOffset OBJECT-TYPE
       SYNTAX      Unsigned64TC
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "This object specifies the IP payload offset used by a
           Hash-based Selection Selector."
       REFERENCE
           "RFC5475, Sections 6.2, 3.8, and 7.1"
       ::= { psampFiltHashParamSetEntry 4 }

   psampFiltHashIpPayloadSize OBJECT-TYPE
       SYNTAX      Unsigned64TC
       MAX-ACCESS  read-only



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       STATUS      current
       DESCRIPTION
           "This object specifies the IP payload size used by a
           Hash-based Selection Selector."
       REFERENCE
           "RFC5475, Sections 6.2, 3.8, and 7.1"
       ::= { psampFiltHashParamSetEntry 5 }

   psampFiltHashSelectedRangeMin OBJECT-TYPE
       SYNTAX      Unsigned64TC
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "This object specifies the value for the beginning of a hash
           function's selected range."
       REFERENCE
           "RFC5475, Sections 6.2, 3.8, and 7.1"
       ::= { psampFiltHashParamSetEntry 6 }

   psampFiltHashSelectedRangeMax OBJECT-TYPE
       SYNTAX      Unsigned64TC
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "This object specifies the value for the end of a hash
           function's selected range."
       REFERENCE
           "RFC5475, Sections 6.2, 3.8, and 7.1"
       ::= { psampFiltHashParamSetEntry 7 }

   psampFiltHashOutputRangeMin OBJECT-TYPE
       SYNTAX      Unsigned64TC
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "This object specifies the value for the beginning of a hash
           function's potential output range."
       REFERENCE
           "RFC5475, Sections 6.2, 3.8, and 7.1"
       ::= { psampFiltHashParamSetEntry 8 }

   psampFiltHashOutputRangeMax OBJECT-TYPE
       SYNTAX      Unsigned64TC
       MAX-ACCESS  read-only
       STATUS      current
       DESCRIPTION
           "This object specifies the value for the end of a hash
           function's potential output range."



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       REFERENCE
           "RFC5475, Sections 6.2, 3.8, and 7.1"
       ::= { psampFiltHashParamSetEntry 9 }

   --==================================================================
   -- Conformance information
   --==================================================================

   psampCompliances OBJECT IDENTIFIER ::= { psampConformance 1 }
   psampGroups      OBJECT IDENTIFIER ::= { psampConformance 2 }

   --==================================================================
   -- Compliance statements
   --==================================================================

   psampCompliance MODULE-COMPLIANCE
       STATUS  current
       DESCRIPTION
           "The implementation of all objects is optional and depends
           on the implementation of the corresponding functionality in
           the equipment."
       MODULE  -- this module
           GROUP psampGroupSampCountBased
           DESCRIPTION
               "These objects must be implemented if the corresponding
               sampling function is implemented in the equipment."
           GROUP psampGroupSampTimeBased
           DESCRIPTION
               "These objects must be implemented if the corresponding
               sampling function is implemented in the equipment."
           GROUP psampGroupSampRandOutOfN
           DESCRIPTION
               "These objects must be implemented if the corresponding
               sampling function is implemented in the equipment."
           GROUP psampGroupSampUniProb
           DESCRIPTION
               "These objects must be implemented if the corresponding
               sampling function is implemented in the equipment."
           GROUP psampGroupFiltPropMatch
           DESCRIPTION
               "These objects must be implemented if the corresponding
               filter function is implemented in the equipment."
           GROUP psampGroupFiltHash
           DESCRIPTION
               "These objects must be implemented if the corresponding
               filter function is implemented in the equipment."
       ::= { psampCompliances 1 }




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   --==================================================================
   -- MIB groupings
   --==================================================================

   psampGroupSampCountBased OBJECT-GROUP
       OBJECTS {
                 psampSampCountBasedAvail,
                 psampSampCountBasedInterval,
                 psampSampCountBasedSpace
               }
       STATUS  current
       DESCRIPTION
           "These objects are needed if count based sampling is
           implemented."
       ::= { psampGroups 1 }

   psampGroupSampTimeBased OBJECT-GROUP
       OBJECTS {
                 psampSampTimeBasedAvail,
                 psampSampTimeBasedInterval,
                 psampSampTimeBasedSpace
               }
       STATUS  current
       DESCRIPTION
           "These objects are needed if time based sampling is
           implemented."
       ::= { psampGroups 2 }

   psampGroupSampRandOutOfN OBJECT-GROUP
       OBJECTS {
                 psampSampRandOutOfNAvail,
                 psampSampRandOutOfNSize,
                 psampSampRandOutOfNPopulation
               }
       STATUS  current
       DESCRIPTION
           "These objects are needed if random n-out-of-N sampling is
           implemented."
       ::= { psampGroups 3 }

   psampGroupSampUniProb OBJECT-GROUP
       OBJECTS {
                 psampSampUniProbAvail,
                 psampSampUniProbProbability
               }
       STATUS  current
       DESCRIPTION
           "These objects are needed if uniform probabilistic sampling



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           is implemented."
       ::= { psampGroups 4 }

   psampGroupFiltPropMatch OBJECT-GROUP
       OBJECTS {
                 psampFiltPropMatchAvail
               }
       STATUS  current
       DESCRIPTION
           "These objects are needed if property match filtering is
           implemented."
       ::= { psampGroups 5 }

   psampGroupFiltHash OBJECT-GROUP
       OBJECTS {
                 psampFiltHashAvail,
                 psampFiltHashFunction,
                 psampFiltHashInitializerValue,
                 psampFiltHashIpPayloadOffset,
                 psampFiltHashIpPayloadSize,
                 psampFiltHashSelectedRangeMin,
                 psampFiltHashSelectedRangeMax,
                 psampFiltHashOutputRangeMin,
                 psampFiltHashOutputRangeMax
               }
       STATUS  current
       DESCRIPTION
           "These objects are needed if hash filtering is implemented."
       ::= { psampGroups 6 }

   END


7.  Security Considerations

   There are no management objects defined in this MIB module that have
   a MAX-ACCESS clause of read-write and/or read-create.  So, if this
   MIB module is implemented correctly, then there is no risk that an
   intruder can alter or create any management objects of this MIB
   module via direct SNMP SET operations.

   All tables in this MIB module may be considered sensitive or
   vulnerable in some network environments because objects in the tables
   may reveal information about the network infrastructure and device
   configuration.  It is thus important to control even GET and/or
   NOTIFY access to these objects and possibly to even encrypt the
   values of these objects when sending them over the network via SNMP.




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   SNMP versions prior to SNMPv3 did not include adequate security.
   Even if the network itself is secure (for example by using IPsec),
   there is no control as to who on the secure network is allowed to
   access and GET/SET (read/change/create/delete) the objects in this
   MIB module.

   It is RECOMMENDED that implementers consider the security features
   provided by the SNMPv3 framework (see [RFC3410], section 8),
   including full support for the SNMPv3 cryptographic mechanisms (for
   authentication and privacy).

   Further, deployment of SNMP versions prior to SNMPv3 is NOT
   RECOMMENDED.  Instead, it is RECOMMENDED to deploy SNMPv3 and to
   enable cryptographic security.  It is then a customer/operator
   responsibility to ensure that the SNMP entity giving access to an
   instance of this MIB module is properly configured to give access to
   the objects only to those principals (users) who have legitimate
   rights to GET or SET (change/create/delete) them.


8.  IANA Considerations

   The MIB module in this document uses the following IANA-assigned
   OBJECT IDENTIFIER values recorded in the SMI Numbers registry:

           Descriptor             OBJECT IDENTIFIER value
           ----------             -----------------------
           psampMIB               { mib-2 xxx }
           psampSampCountBased    { ipfixSelectorFunctions 2 }
           psampSampTimeBased     { ipfixSelectorFunctions 3 }
           psampSampRandOutOfN    { ipfixSelectorFunctions 4 }
           psampSampUniProb       { ipfixSelectorFunctions 5 }
           psampFiltPropMatch     { ipfixSelectorFunctions 6 }
           psampFiltHash          { ipfixSelectorFunctions 7 }

   Other than that this document does not impose any IANA
   considerations.

   Editor's Note (to be removed prior to publication): the IANA is
   requested to assign a value for "xxx" under the 'mib-2' subtree and
   to record the assignment in the SMI Numbers registry.  When the
   assignment has been made, the RFC Editor is asked to replace "xxx"
   (here and in the MIB module) with the assigned value and to remove
   this note.  The RFC editor is also asked to replace "yyyy" in the MIB
   module by the number of the RFC when the assignment has been made.






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9.  Acknowledgment

   This document is a product of the PSAMP and IPFIX working groups.
   The authors would like to thank the following persons: Paul Aitken
   for his detailed review, Dan Romascanu and the MIB doctors, and many
   more, for the technical reviews and feedback.


10.  References

10.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC2578]  McCloghrie, K., Ed., Perkins, D., Ed., and J.
              Schoenwaelder, Ed., "Structure of Management Information
              Version 2 (SMIv2)", STD 58, RFC 2578, April 1999.

   [RFC2579]  McCloghrie, K., Ed., Perkins, D., Ed., and J.
              Schoenwaelder, Ed., "Textual Conventions for SMIv2",
              STD 58, RFC 2579, April 1999.

   [RFC2580]  McCloghrie, K., Perkins, D., and J. Schoenwaelder,
              "Conformance Statements for SMIv2", STD 58, RFC 2580,
              April 1999.

   [RFC2564]  Kalbfleisch, C., Krupczak, C., Presuhn, R., and J.
              Saperia, "Application Management MIB", RFC 2564, May 1999.

   [RFC5101]  Claise, B., "Specification of the IP Flow Information
              Export (IPFIX) Protocol for the Exchange of IP Traffic
              Flow Information", RFC 5101, January 2008.

   [RFC5477]  Dietz, T., Claise, B., Aitken, P., Dressler, F., and G.
              Carle, "Information Model for Packet Sampling Exports",
              RFC 5477, March 2009.

   [RFC5815]  Dietz, T., Kobayashi, A., Claise, B., and G. Muenz,
              "Definitions of Managed Objects for IP Flow Information
              Export", RFC 5815, April 2010.

   [I-D.ietf-opsawg-mib-floats]
              Presuhn, R., "Textual Conventions for the Representation
              of Floating-Point Numbers",
              draft-ietf-opsawg-mib-floats-00 (work in progress),
              January 2011.




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10.2.  Informative References

   [RFC3410]  Case, J., Mundy, R., Partain, D., and B. Stewart,
              "Introduction and Applicability Statements for Internet-
              Standard Management Framework", RFC 3410, December 2002.

   [RFC5474]  Duffield, N., Chiou, D., Claise, B., Greenberg, A.,
              Grossglauser, M., and J. Rexford, "A Framework for Packet
              Selection and Reporting", RFC 5474, March 2009.

   [RFC5475]  Zseby, T., Molina, M., Duffield, N., Niccolini, S., and F.
              Raspall, "Sampling and Filtering Techniques for IP Packet
              Selection", RFC 5475, March 2009.

   [RFC5476]  Claise, B., Johnson, A., and J. Quittek, "Packet Sampling
              (PSAMP) Protocol Specifications", RFC 5476, March 2009.


Authors' Addresses

   Thomas Dietz (editor)
   NEC Europe Ltd.
   NEC Laboratories Europe
   Kurfuersten-Anlage 36
   Heidelberg  69115
   DE

   Phone: +49 6221 4342-128
   Email: dietz@neclab.eu


   Benoit Claise
   Cisco Systems, Inc.
   De Kleetlaan 6a b1
   Degem  1831
   BE

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












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   Juergen Quittek
   NEC Europe Ltd.
   NEC Laboratories Europe
   Kurfuersten-Anlage 36
   Heidelberg  69115
   DE

   Phone: +49 6221 4342-115
   Email: quittek@neclab.eu










































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