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IETF RFC 6727
Last modified on Wednesday, October 3rd, 2012
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Internet Engineering Task Force (IETF) T. Dietz, Ed.
Request for Comments: 6727 NEC Europe Ltd.
Category: Standards Track B. Claise
ISSN: 2070-1721 Cisco Systems, Inc.
J. Quittek
NEC Europe Ltd.
October 2012
Definitions of Managed Objects for Packet Sampling
 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-SELECTOR-MIB
module. For IP Flow Information eXport (IPFIX) implementations that
use Packet Sampling (PSAMP) techniques, 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 is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/RFC 6727.
Dietz, et al. Standards Track PAGE 1 
RFC 6727 PSAMP MIB October 2012
Copyright Notice
Copyright (c) 2012 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
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. Overview of PSAMP Documents . . . . . . . . . . . . . . . . . 4
4. Related IPFIX Documents . . . . . . . . . . . . . . . . . . . 4
5. Structure of the PSAMP MIB module . . . . . . . . . . . . . . 4
5.1. Textual Conventions . . . . . . . . . . . . . . . . . . . 5
5.2. Packet Selection Functions . . . . . . . . . . . . . . . . 6
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 . . . . . . . . . . . . . . . . . . . . . . . . . 9
7. Security Considerations . . . . . . . . . . . . . . . . . . . 25
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 25
9. Acknowledgment . . . . . . . . . . . . . . . . . . . . . . . . 26
10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 26
10.1. Normative References . . . . . . . . . . . . . . . . . . . 26
10.2. Informative References . . . . . . . . . . . . . . . . . . 27
Dietz, et al. Standards Track PAGE 2
RFC 6727 PSAMP MIB October 2012
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 [RFC 3410].
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 a MIB
module that is compliant to the SMIv2, which is described in STD 58,
RFC 2578 [RFC 2578], STD 58, RFC 2579 [RFC 2579] and STD 58,RFC 2580
[RFC 2580].
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 [RFC 2119].
This document is a product of the IP Flow Information eXport (IPFIX)
Working Group (WG). Work on this document was started in the Packet
Sampling (PSAMP) 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 [RFC 5475].
It is assumed that packet Sampling is performed according to the
framework defined in [RFC 5474]. In this document, the PSAMP terms
that appear capitalized are used as defined in [RFC 5475].
Managed objects in the PSAMP MIB module are defined as an extension
of the IPFIX-MIB and IPFIX-SELECTOR-MIB modules [RFC 6615]. 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 [RFC 5477].
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.
Dietz, et al. Standards Track PAGE 3
RFC 6727 PSAMP MIB October 2012
3. Overview of PSAMP Documents
[RFC 5474]: "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.
[RFC 5475]: "Sampling and Filtering Techniques for IP Packet
Selection" describes the set of packet selection techniques supported
by PSAMP.
[RFC 5476]: "Packet Sampling (PSAMP) Protocol Specifications"
specifies the export of packet information from a PSAMP Exporting
Process to a PSAMP Collecting Process.
[RFC 5477]: "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.
[RFC 5101]: "Specification of the IP Flow Information Export (IPFIX)
Protocol for the Exchange of IP Traffic Flow Information" specifies
how IPFIX Data Records and Templates are carried via a congestion-
aware transport protocol from IPFIX Exporting Processes to IPFIX
Collecting Processes. It also specifies the data types used in the
PSAMP MIB module and their encoding.
[RFC 6615]: The IPFIX-MIB "Definitions of Managed Objects for IP Flow
Information Export" is the basis for this document because it extends
the IPFIX SELECTOR MIB module defined there.
5. Structure of the PSAMP MIB module
The IPFIX-MIB module defined in [RFC 6615] 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 that contains only one additional object
indicating the current availability of the function. For functions
Dietz, et al. Standards Track PAGE 4
RFC 6727 PSAMP MIB October 2012
that 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 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 module is a very small
module that is defined in [RFC 6615]. The top-level OIDs of the
parameter trees located beneath ipfixSelectorFunctions are maintained
by IANA. In the IPFIX SELECTOR MIB module as defined by [RFC 6615],
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 defined in this document registers additional
top-level OIDs for the parameter subtrees of its Selector functions
in the IPFIX-SELECTOR-MIB Function sub-registry according to the
procedures defined in [RFC 6615]. It introduces six new subtrees
beneath 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 [RFC 6615]. All functions and their parameters are already listed
in the overview of functions given by the table in Section 8.2.1 of
[RFC 5477].
5.1. Textual Conventions
The PSAMP MIB module imports two textual conventions that define data
types used in this MIB module from other MIB modules. The
Unsigned64TC data type is imported from the APPLICATION MIB module
[RFC 2564], and the Float64TC data type is imported from the FLOAT-TC-
MIB module [RFC 6340]. Those data types are defined according to
[RFC 5101]. Those data types are not an integral part of [RFC 2578]
but are needed to define objects in this MIB module that conform to
the Information Elements defined for those objects in [RFC 5477].
The Unsigned64TC textual convention describes an unsigned integer of
64 bits. It is imported from the APPLICATION MIB module. The
Float64TC textual convention describes the format that is used for
64-bit floating point numbers.
Dietz, et al. Standards Track PAGE 5
RFC 6727 PSAMP MIB October 2012
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
different Selector functions. All objects are named and structured
according to Section 8.2.1 of [RFC 5477]:
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 [RFC 5475]. More information on the Selector Reports can
also be found in Section 6.5.2 of [RFC 5476].
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 combinations of values of these
parameters for different instances of the Selector function are
represented by different conceptual rows in the table
psampSampCountBasedParamSetTable:
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 subtree for this function is similar to the
psampSampCountBased subtree. Parameters are
Dietz, et al. Standards Track PAGE 6
RFC 6727 PSAMP MIB October 2012
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:
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 [RFC 5477],
there are no agreed parameters specified and the subtree for this
function only contains an object indicating the availability of this
function. Parameters cannot be retrieved via the PSAMP MIB module:
Dietz, et al. Standards Track PAGE 7
RFC 6727 PSAMP MIB October 2012
psampFiltPropMatch(6)
+-- psampFiltPropMatchAvail(1)
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 functions 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.
Dietz, et al. Standards Track PAGE 8
RFC 6727 PSAMP MIB October 2012
6. Definitions
PSAMP-MIB DEFINITIONS ::= BEGIN
IMPORTS
MODULE-IDENTITY, OBJECT-TYPE, Integer32, Unsigned32, mib-2
FROM SNMPv2-SMI -- RFC 2578
TruthValue
FROM SNMPv2-TC -- RFC 2579
MODULE-COMPLIANCE, OBJECT-GROUP
FROM SNMPv2-CONF -- RFC 2580
Unsigned64TC
FROM APPLICATION-MIB -- RFC 2564
Float64TC
FROM FLOAT-TC-MIB -- RFC 6340
ipfixSelectorFunctions
FROM IPFIX-SELECTOR-MIB; -- RFC 6615
psampMIB MODULE-IDENTITY
LAST-UPDATED "201209051200Z" -- 5 September 2012
ORGANIZATION "IETF IPFIX Working Group"
CONTACT-INFO
"WG charter:
http://datatracker.ietf.org/wg/ipfix/charter/
Mailing Lists:
General Discussion: ipfix@ietf.org
To Subscribe: https://www.ietf.org/mailman/listinfo/ipfix
Archive:
http://www.ietf.org/mail-archive/web/ipfix/current/maillist.html
Thomas Dietz (editor)
NEC Europe Ltd.
NEC Laboratories Europe
Network Research Division
Kurfuersten-Anlage 36
69115 Heidelberg
Germany
Phone: +49 6221 4342-128
EMail: Thomas.Dietz@neclab.eu
Benoit Claise
Cisco Systems, Inc.
De Kleetlaan 6a b1
Diegem 1831
Belgium
Phone: +32 2 704 5622
EMail: bclaise@cisco.com
Dietz, et al. Standards Track PAGE 9
RFC 6727 PSAMP MIB October 2012
Juergen Quittek
NEC Europe Ltd.
NEC Laboratories Europe
Network Research Division
Kurfuersten-Anlage 36
69115 Heidelberg
Germany
Phone: +49 6221 4342-115
EMail: quittek@neclab.eu"
DESCRIPTION
"The PSAMP MIB defines managed objects for packet sampling
and filtering.
These objects provide information about managed nodes
supporting packet sampling, including packet sampling
capabilities, configuration, and statistics.
The PSAMP MIB module registers additional top-level OIDs for
the parameter subtrees of its Selector functions in the
IPFIX-SELECTOR-MIB Function sub-registry according to the
procedures defined in RFC 6615.
Copyright (c) 2012 IETF Trust and the persons identified
as authors of the code. All rights reserved.
Redistribution and use in source and binary forms, with or
without modification, is permitted pursuant to, and subject
to the license terms contained in, the Simplified BSD License
set forth in Section 4.c of the IETF Trust's Legal Provisions
Relating to IETF Documents
(http://trustee.ietf.org/license-info).
This version of this MIB module is part of RFC 6727; see the
RFC itself for full legal notices."
-- Revision history
REVISION "201209051200Z" -- 5 September 2012
DESCRIPTION
"Initial version, published as RFC 6727."
::= { mib-2 212 }
-- Top-level structure of the MIB
psampObjects OBJECT IDENTIFIER ::= { psampMIB 1 }
psampConformance OBJECT IDENTIFIER ::= { psampMIB 2 }
--==================================================================
-- Packet selection sampling methods group of objects
--==================================================================
Dietz, et al. Standards Track PAGE 10
RFC 6727 PSAMP MIB October 2012
--==================================================================
--* Method 1: Systematic count-based Sampling
--==================================================================
-- Reference: RFC 5475 (Section 5.1), RFC 5476 (Section 6.5.2.1),
-- and RFC 5477 (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.
A Selector may be unavailable if it is implemented but
currently disabled due to, e.g., administrative reasons, lack
of resources, or similar."
::= { 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,
Dietz, et al. Standards Track PAGE 11
RFC 6727 PSAMP MIB October 2012
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 ipfixSelectionProcessSelectorFunction entries of
the ipfixSelectionProcessTable in the IPFIX-MIB as reference
to this parameter set."
::= { psampSampCountBasedParamSetEntry 1 }
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
"RFC 5475 (Section 5.1) and RFC 5477 (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
intervals specified by the object
psampSampCountBasedInterval. A value of 100 means that
the next interval starts 100 packets (which are not sampled)
after the current psampSampCountBasedInterval is over."
REFERENCE
"RFC 5475 (Section 5.1) and RFC 5477 (Section 8.2)"
::= { psampSampCountBasedParamSetEntry 3 }
--==================================================================
--* Method 2: Systematic time-based Sampling
--==================================================================
Dietz, et al. Standards Track PAGE 12
RFC 6727 PSAMP MIB October 2012
-- Reference: RFC 5475 (Section 5.1), RFC 5476 (Section 6.5.2.2),
-- and RFC 5477 (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."
::= { 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
}
Dietz, et al. Standards Track PAGE 13
RFC 6727 PSAMP MIB October 2012
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 ipfixSelectionProcessSelectorFunction entries 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
STATUS current
DESCRIPTION
"This object specifies the time interval in microseconds
during which all arriving packets are sampled."
REFERENCE
"RFC 5475 (Section 5.1) and RFC 5477 (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 intervals specified by the object
psampSampTimeBasedInterval. 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
"RFC 5475 (Section 5.1) and RFC 5477 (Section 8.2)"
::= { psampSampTimeBasedParamSetEntry 3 }
--==================================================================
--* Method 3: Random n-out-of-N Sampling
--==================================================================
-- Reference: RFC 5475 (Section 5.2.1), RFC 5476 (Section 6.5.2.3),
-- and RFC 5477 (Section 8.2)
psampSampRandOutOfN OBJECT IDENTIFIER
::= { ipfixSelectorFunctions 4 }
Dietz, et al. Standards Track PAGE 14
RFC 6727 PSAMP MIB October 2012
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."
::= { psampSampRandOutOfN 1 }
-- Parameter Set Table +++++++++++++++++++++++++++++++++++++++++++++
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
Dietz, et al. Standards Track PAGE 15
RFC 6727 PSAMP MIB October 2012
"The index of this parameter set in the
psampSampRandOutOfNParamSetTable. It is used in the
object ipfixSelectionProcessSelectorFunction entries 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
psampSampRandOutOfNPopulation."
REFERENCE
"RFC 5475 (Section 5.2.1) and RFC 5477 (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
"RFC 5475 (Section 5.2.1) and RFC 5477 (Section 8.2)"
::= { psampSampRandOutOfNParamSetEntry 3 }
--==================================================================
--* Method 4: Uniform probabilistic Sampling
--==================================================================
-- Reference: RFC 5475 (Section 5.2.2), RFC 5476 (Section 6.5.2.4),
-- and RFC 5477 (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.
Dietz, et al. Standards Track PAGE 16
RFC 6727 PSAMP MIB October 2012
A Selector may be unavailable if it is implemented but
currently disabled due to, e.g., administrative reasons, lack
of resources, or similar."
::= { psampSampUniProb 1 }
-- Parameter Set Table +++++++++++++++++++++++++++++++++++++++++++++
-- Reference: RFC 5475 (Section 5.2.2.1) and RFC 5477 (Section 8.2)
psampSampUniProbParamSetTable OBJECT-TYPE
SYNTAX SEQUENCE OF
PsampSampUniProbParamSetEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"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 ipfixSelectionProcessSelectorFunction entries of
the ipfixSelectionProcessTable in the IPFIX-MIB as reference
to this parameter set."
::= { psampSampUniProbParamSetEntry 1 }
psampSampUniProbProbability OBJECT-TYPE
SYNTAX Float64TC
Dietz, et al. Standards Track PAGE 17
RFC 6727 PSAMP MIB October 2012
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. NaN (not a number) and infinity MUST NOT
be used."
REFERENCE
"RFC 5475 (Section 5.2.2.1) and RFC 5477 (Section 8.2)"
::= { psampSampUniProbParamSetEntry 2 }
--==================================================================
-- Packet selection filtering methods for a group of objects
--==================================================================
--==================================================================
--* Method 5: Property Match filtering
--==================================================================
-- Reserves Method 5; see RFC 5475 (Section 6.1), RFC 5476
-- (Section 6.5.2.5), and RFC 5477
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."
::= { psampFiltPropMatch 1 }
--==================================================================
--* Method 6: Hash filtering
--==================================================================
-- Reference: RFC 5475 (Section 6.2), RFC 5476 (Section 6.5.2.6),
-- and RFC 5477 (Section 8.3)
psampFiltHash OBJECT IDENTIFIER ::= { ipfixSelectorFunctions 7 }
Dietz, et al. Standards Track PAGE 18
RFC 6727 PSAMP MIB October 2012
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."
::= { psampFiltHash 1 }
psampFiltHashCapabilities OBJECT IDENTIFIER
::= { psampFiltHash 2 }
-- Parameter Set Table +++++++++++++++++++++++++++++++++++++++++++++
-- Reference: RFC 5475, 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,
Dietz, et al. Standards Track PAGE 19
RFC 6727 PSAMP MIB October 2012
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 ipfixSelectionProcessSelectorFunction entries of
the ipfixSelectionProcessTable in the IPFIX-MIB as reference
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
defines the following hash functions:
crc32(1): The CRC-32 Hash Function as defined in RFC 1141.
ipsx(2): The IPSX Hash Function as described in RFC 5475,
Appendix A.1.
bob(3): The BOB Hash Function as described in RFC 5475,
Appendix A.2.
"
REFERENCE
"RFC 5475 (Section 6.2 and Appendixes A.1 and A.2)
and RFC 1141"
::= { psampFiltHashParamSetEntry 2 }
psampFiltHashInitializerValue OBJECT-TYPE
SYNTAX Unsigned64TC
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object specifies the initializer value to the hash
function."
Dietz, et al. Standards Track PAGE 20
RFC 6727 PSAMP MIB October 2012
REFERENCE
"RFC 5475, 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
"RFC 5475, Sections 6.2, 3.8, and 7.1"
::= { psampFiltHashParamSetEntry 4 }
psampFiltHashIpPayloadSize OBJECT-TYPE
SYNTAX Unsigned64TC
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"This object specifies the IP payload size used by a
Hash-based Selection Selector."
REFERENCE
"RFC 5475, 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
"RFC 5475, 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
"RFC 5475, Sections 6.2, 3.8, and 7.1"
::= { psampFiltHashParamSetEntry 7 }
Dietz, et al. Standards Track PAGE 21
RFC 6727 PSAMP MIB October 2012
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
"RFC 5475, 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."
REFERENCE
"RFC 5475, 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 systematic
count-based sampling is implemented in the equipment."
GROUP psampGroupSampTimeBased
DESCRIPTION
"These objects must be implemented if systematic
time-based sampling is implemented in the equipment."
Dietz, et al. Standards Track PAGE 22
RFC 6727 PSAMP MIB October 2012
GROUP psampGroupSampRandOutOfN
DESCRIPTION
"These objects must be implemented if random n-out-of-N
sampling is implemented in the equipment."
GROUP psampGroupSampUniProb
DESCRIPTION
"These objects must be implemented if uniform
probabilistic sampling is implemented in the equipment."
GROUP psampGroupFiltPropMatch
DESCRIPTION
"These objects must be implemented if the property match
filtering is implemented in the equipment."
GROUP psampGroupFiltHash
DESCRIPTION
"These objects must be implemented if hash filtering
is implemented in the equipment."
::= { psampCompliances 1 }
--==================================================================
-- 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 {
Dietz, et al. Standards Track PAGE 23
RFC 6727 PSAMP MIB October 2012
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
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 }
Dietz, et al. Standards Track PAGE 24
RFC 6727 PSAMP MIB October 2012
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.
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 [RFC 3410], 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 value recorded in the SMI Numbers registry:
Descriptor OBJECT IDENTIFIER value
---------- -----------------------
psampMIB { mib-2 212 }
Dietz, et al. Standards Track PAGE 25
RFC 6727 PSAMP MIB October 2012
Further, IANA has registered the following top-level OIDs in the
IPFIX-SELECTOR-MIB Functions sub-registry at
http://www.iana.org/assignments/smi-numbers according to the
procedures set forth in [RFC 6615]:
Decimal Name Description Reference
------- ------------------- -------------------------------- ---------
2 psampSampCountBased Systematic Count-based Sampling [RFC 6727]
3 psampSampTimeBased Systematic Time-based Sampling [RFC 6727]
4 psampSampRandOutOfN Random n-out-of-N Sampling [RFC 6727]
5 psampSampUniProb Universal Probabilistic Sampling [RFC 6727]
6 psampFiltPropMatch Property Match Filtering [RFC 6727]
7 psampFiltHash Hash-based Filtering [RFC 6727]
The prerequisites set forth for addition of these OIDs are to be
verified based on the content of this document.
9. Acknowledgment
This document is a product of the PSAMP and IPFIX WGs. The authors
would like to thank the following persons: Paul Aitken for his
detailed review, Dan Romascanu, the MIB doctors, and many more, for
the technical reviews and feedback.
10. References
10.1. Normative References
[RFC 2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC 2564] Kalbfleisch, C., Krupczak, C., Presuhn, R., and J.
Saperia, "Application Management MIB", RFC 2564, May 1999.
[RFC 2578] McCloghrie, K., Ed., Perkins, D., Ed., and J.
Schoenwaelder, Ed., "Structure of Management Information
Version 2 (SMIv2)", STD 58, RFC 2578, April 1999.
[RFC 2579] McCloghrie, K., Ed., Perkins, D., Ed., and J.
Schoenwaelder, Ed., "Textual Conventions for SMIv2",
STD 58, RFC 2579, April 1999.
[RFC 2580] McCloghrie, K., Perkins, D., and J. Schoenwaelder,
"Conformance Statements for SMIv2", STD 58, RFC 2580,
April 1999.
Dietz, et al. Standards Track PAGE 26
RFC 6727 PSAMP MIB October 2012
[RFC 5101] Claise, B., "Specification of the IP Flow Information
Export (IPFIX) Protocol for the Exchange of IP Traffic
Flow Information", RFC 5101, January 2008.
[RFC 5477] Dietz, T., Claise, B., Aitken, P., Dressler, F., and G.
Carle, "Information Model for Packet Sampling Exports",
RFC 5477, March 2009.
[RFC 6340] Presuhn, R., "Textual Conventions for the Representation
of Floating-Point Numbers", RFC 6340, August 2011.
[RFC 6615] Dietz, T., Kobayashi, A., Claise, B., and G. Muenz,
"Definitions of Managed Objects for IP Flow Information
Export", RFC 6615, June 2012.
10.2. Informative References
[RFC 3410] Case, J., Mundy, R., Partain, D., and B. Stewart,
"Introduction and Applicability Statements for Internet-
Standard Management Framework", RFC 3410, December 2002.
[RFC 5474] Duffield, N., Chiou, D., Claise, B., Greenberg, A.,
Grossglauser, M., and J. Rexford, "A Framework for Packet
Selection and Reporting", RFC 5474, March 2009.
[RFC 5475] Zseby, T., Molina, M., Duffield, N., Niccolini, S., and F.
Raspall, "Sampling and Filtering Techniques for IP Packet
Selection", RFC 5475, March 2009.
[RFC 5476] Claise, B., Johnson, A., and J. Quittek, "Packet Sampling
(PSAMP) Protocol Specifications", RFC 5476, March 2009.
Dietz, et al. Standards Track PAGE 27
RFC 6727 PSAMP MIB October 2012
Authors' Addresses
Thomas Dietz (editor)
NEC Europe Ltd.
NEC Laboratories Europe
Kurfuersten-Anlage 36
69115 Heidelberg
Germany
Phone: +49 6221 4342-128
EMail: dietz@neclab.eu
Benoit Claise
Cisco Systems, Inc.
De Kleetlaan 6a b1
Diegem 1831
Belgium
Phone: +32 2 704 5622
EMail: bclaise@cisco.com
Juergen Quittek
NEC Europe Ltd.
NEC Laboratories Europe
Kurfuersten-Anlage 36
69115 Heidelberg
Germany
Phone: +49 6221 4342-115
EMail: quittek@neclab.eu
Dietz, et al. Standards Track PAGE 28
RFC TOTAL SIZE: 55441 bytes
PUBLICATION DATE: Wednesday, October 3rd, 2012
LEGAL RIGHTS: The IETF Trust (see BCP 78)
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