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 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 Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 1] Internet-Draft PSAMP MIB March 2011 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 Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 2] Internet-Draft PSAMP MIB March 2011 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. Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 3] Internet-Draft PSAMP MIB March 2011 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 Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 4] Internet-Draft PSAMP MIB March 2011 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 Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 5] Internet-Draft PSAMP MIB March 2011 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: Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 6] Internet-Draft PSAMP MIB March 2011 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) Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 7] Internet-Draft PSAMP MIB March 2011 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 Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 8] Internet-Draft PSAMP MIB March 2011 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 Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 9] Internet-Draft PSAMP MIB March 2011 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. Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 10] Internet-Draft PSAMP MIB March 2011 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 } Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 11] Internet-Draft PSAMP MIB March 2011 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 } Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 12] Internet-Draft PSAMP MIB March 2011 ::= { 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 Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 13] Internet-Draft PSAMP MIB March 2011 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 +++++++++++++++++++++++++++++++++++++++++++++ Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 14] Internet-Draft PSAMP MIB March 2011 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 Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 15] Internet-Draft PSAMP MIB March 2011 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 Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 16] Internet-Draft PSAMP MIB March 2011 "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 } --================================================================== Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 17] Internet-Draft PSAMP MIB March 2011 -- 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 } Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 18] Internet-Draft PSAMP MIB March 2011 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 Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 19] Internet-Draft PSAMP MIB March 2011 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 Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 20] Internet-Draft PSAMP MIB March 2011 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." Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 21] Internet-Draft PSAMP MIB March 2011 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 } Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 22] Internet-Draft PSAMP MIB March 2011 --================================================================== -- 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 Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 23] Internet-Draft PSAMP MIB March 2011 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. Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 24] Internet-Draft PSAMP MIB March 2011 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. Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 25] Internet-Draft PSAMP MIB March 2011 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. Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 26] Internet-Draft PSAMP MIB March 2011 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 Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 27] Internet-Draft PSAMP MIB March 2011 Juergen Quittek NEC Europe Ltd. NEC Laboratories Europe Kurfuersten-Anlage 36 Heidelberg 69115 DE Phone: +49 6221 4342-115 Email: quittek@neclab.eu Dietz, et al. draft-ietf-ipfix-psamp-mib-03.txt [Page 28]