Definitions of Textual Conventions (TCs) for Bidirectional Forwarding Detection (BFD) Management
draft-ietf-bfd-tc-mib-02

Abstract

This draft defines a Management Information Base (MIB) module which contains Textual Conventions to represent commonly used Bidirectional Forwarding Detection (BFD) management information. The intent is that these TEXTUAL CONVENTIONS (TCs) will be imported and used in BFD related MIB modules that would otherwise define their own representations.

Requirements Language

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14, RFC 2119 [RFC2119].

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 December 21, 2013.

Copyright Notice

Copyright (c) 2013 IETF Trust and the persons identified as the document authors. All rights reserved.

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Table of Contents

• 1. The Internet-Standard Management Framework
• 2. Introduction
• 3. BFD Textual Conventions MIB Definitions
• 4. Security Considerations
• 5. IANA Considerations
• 6. References
• 6.1. Normative References
• 6.2. Informative References
• Appendix A. Acknowledgments
• Authors' Addresses

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 a MIB module 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

This document defines a MIB module which contains Textual Conventions for Bidirectional Forwarding Detection (BFD) protocols. These Textual Conventions should be imported by MIB modules which manage BFD protocols.

For an introduction to the concepts of BFD, see [RFC5880], [RFC5881] and [RFC5883].

3. BFD Textual Conventions MIB Definitions

 BFD-TC-STD-MIB DEFINITIONS ::= BEGIN

 IMPORTS
     MODULE-IDENTITY, mib-2, Unsigned32
         FROM SNMPv2-SMI                                 -- [RFC2578]

     TEXTUAL-CONVENTION
         FROM SNMPv2-TC;                                 -- [RFC2579]

 bfdTCStdMib MODULE-IDENTITY
     LAST-UPDATED "201306191200Z" -- 19 June 2013 12:00:00 EST
     ORGANIZATION "IETF Bidirectional Forwarding Detection
                   Working Group"
     CONTACT-INFO
         "Thomas D. Nadeau
          Juniper Networks
          Email:  tnadeau@lucidvision.com

          Zafar Ali
          Cisco Systems, Inc.
          Email:  zali@cisco.com

          Nobo Akiya
          Cisco Systems, Inc.
          Email:  nobo@cisco.com"
     DESCRIPTION
         "This MIB module defines TEXTUAL-CONVENTIONs for concepts
          used in Bidirectional Forwarding Detection (BFD)
          protocols."
     REVISION "201306191200Z" -- 19 June 2013 12:00:00 EST
     DESCRIPTION
         "Initial version. Published as RFC xxxx."
 -- RFC Ed.: RFC-editor pls fill in xxxx
 ::= { mib-2 XXX }
 -- RFC Ed.: assigned by IANA, see section 5 for details

 BfdSessIndexTC ::= TEXTUAL-CONVENTION
 DISPLAY-HINT   "d"
 STATUS         current
 DESCRIPTION
     "An index used to uniquely identify BFD sessions."
 SYNTAX Unsigned32 (1..4294967295)

 BfdIntervalTC ::= TEXTUAL-CONVENTION
 DISPLAY-HINT  "d"
 STATUS        current
 DESCRIPTION
     "The BFD interval in microseconds."
 SYNTAX Unsigned32 (0..4294967295)

 BfdMultiplierTC ::= TEXTUAL-CONVENTION
 DISPLAY-HINT    "d"
 STATUS          current
 DESCRIPTION
     "The BFD failure detection multiplier."
 SYNTAX Unsigned32 (1..255)

 BfdDiagTC ::= TEXTUAL-CONVENTION
 STATUS       current
 DESCRIPTION
     "A common BFD diagnostic code."
 SYNTAX INTEGER {
     noDiagnostic(0),
     controlDetectionTimeExpired(1),
     echoFunctionFailed(2),
     neighborSignaledSessionDown(3),
     forwardingPlaneReset(4),
     pathDown(5),
     concatenatedPathDown(6),
     administrativelyDown(7),
     reverseConcatenatedPathDown(8)
 }

 BfdSessTypeTC ::= TEXTUAL-CONVENTION
 STATUS        current
 DESCRIPTION
     "BFD session type"
 REFERENCE
     "Katz, D. and D. Ward, Bidirectional Forwarding
           Detection (BFD), RFC 5880, June 2010.

      Katz, D. and D. Ward, Bidirectional Forwarding
           Detection (BFD) for IPv4 and IPv6 (Single Hop),
           RFC 5881, June 2010.

      Katz, D. and D. Ward, Bidirectional Forwarding
           Detection (BFD) for Multihop Paths, RFC 5883,
           June 2010."
 SYNTAX INTEGER {
     singleHop(1),
     multiHopTotallyArbitraryPaths(2),
     multiHopOutOfBandSignaling(3),
     multiHopUnidirectionalLinks(4),
     multiPointHead(5),
     multiPointTail(6)
 }

 BfdSessOperModeTC ::= TEXTUAL-CONVENTION
 STATUS            current
 DESCRIPTION
     "BFD session operating mode"
 REFERENCE
     "Katz, D. and D. Ward, "Bidirectional Forwarding
           Detection (BFD)", RFC 5880, June 2010."
 SYNTAX INTEGER {
     asyncModeWEchoFunction(1),
     asynchModeWOEchoFunction(2),
     demandModeWEchoFunction(3),
     demandModeWOEchoFunction(4)
 }

 BfdCtrlDestPortNumberTC ::= TEXTUAL-CONVENTION
 DISPLAY-HINT            "d"
 STATUS                  current
 DESCRIPTION
     "UDP destination port number of BFD control packets.
      3784 represents single hop BFD session.
      4784 represents multi hop BFD session.
      However, syntax is left open to wider range of values
      purposely for two reasons:
      1. implementation uses non-compliant port number for
         valid proprietary reason.
      2. potential future extension drafts."
 REFERENCE
     "Use of port 3784 from Katz, D. and D. Ward,
           Bidirectional Forwarding
           Detection (BFD) for IPv4 and IPv6 (Single Hop)",
           RFC 5881, June 2010.

      Use of port 4784 from Katz, D. and D. Ward, Bidirectional
           Forwarding Detection (BFD) for IPv4 and IPv6
           (Single Hop), RFC 5881, June 2010."
 SYNTAX Unsigned32 (0..65535)

 BfdCtrlSourcePortNumberTC ::= TEXTUAL-CONVENTION
 DISPLAY-HINT              "d"
 STATUS                    current
 DESCRIPTION
     "UDP source port number of BFD control packets.
      However, syntax is left open to wider range of values
      purposely for two reasons:
      1. implementation uses non-compliant port number for
         valid proprietary reason.
      2. potential future extension drafts."
 REFERENCE
     "Port 49152..65535 (RFC5881)"
 SYNTAX Unsigned32 (0..65535)

 BfdSessStateTC ::= TEXTUAL-CONVENTION
 STATUS         current
 DESCRIPTION
     "BFD session state. State failing(5) is only applicable if
      corresponding session is running in BFD version 0."
 REFERENCE
     "RFC 5880 - Bidirectional Forwarding Detection (BFD), Katz,
      D., Ward, D., June 2010."
 SYNTAX INTEGER {
     adminDown(1),
     down(2),
     init(3),
     up(4),
     failing(5)
 }

 BfdSessAuthenticationTypeTC ::= TEXTUAL-CONVENTION
 STATUS                      current
 DESCRIPTION
     "BFD authentication type"
 REFERENCE
     "Sections 4.2 - 4.4 from Katz, D. and D. Ward,
      Bidirectional Forwarding Detection (BFD),
      RFC 5880, June 2010."
 SYNTAX INTEGER {
     noAuthentication(-1),
     reserved(0),
     simplePassword(1),
     keyedMD5(2),
     meticulousKeyedMD5(3),
     keyedSHA1(4),
     meticulousKeyedSHA1(5)
 }

 BfdSessionAuthenticationKeyTC ::= TEXTUAL-CONVENTION
 DISPLAY-HINT                  "1x "
 STATUS                        current
 DESCRIPTION
     "BFD authentication key type.

      A BfdSessionAuthenticationKeyTC is always interpreted within
      the context of an BfdSessAuthenticationTypeTC value.  Every
      usage of the BfdSessionAuthenticationTypeTC textual
      convention is required to specify the
      BfdSessionAuthenticationKeyTC object that provides the
      context.  It is suggested that the
      BfdSessionAuthentcationTypeTC object be logically registered
      before the object(s) that use the
      BfdSessionAuthenticationKeyTC textual convention, if they
      appear in the same logical row.

      The value of a BfdSessionAuthenticationKeyTC must always be
      consistent with the value of the associated
      BfdSessionAuthencationTypeTC object.  Attempts to set a
      BfdSessionAuthenticationKeyTC object to a value inconsistent
      with the associated BfdSessionAuthenticationTypeTC must fail
      with an inconsistentValue error.

      The following size constraints for a
      BfdSessionAuthenticationKeyTC object are defined for the
      associated BfdSessionAuthenticationTypeTC values show below:

      noAuthentication(-1): SIZE(0)
      reserved(0): SIZE(0)
      simplePassword(1): SIZE(1..16)
      keyedMD5(2): SIZE(16)
      meticulousKeyedMD5(3): SIZE(16)
      keyedSHA1(4): SIZE(20)
      meticulousKeyedSHA1(5): SIZE(20)

      When this textual convention is used as the syntax of an
      index object, there may be issues with the limit of 128
      sub-identifiers specified in SMIv2, STD 58.  In this case,
      the object definition MUST include a 'SIZE' clause to limit
      the number of potential instance sub-identifiers; otherwise
      the applicable constraints MUST be stated in the appropriate
      conceptual row DESCRIPTION clauses, or in the surrounding
      documentation if there is no single DESCRIPTION clause that
      is appropriate."
 REFERENCE
     "RFC5880, Sections 4.2 - 4.4"
 SYNTAX OCTET STRING(SIZE(0..252))

 END
      	

4. Security Considerations

This module does not define any management objects. Instead, it defines a set of textual conventions which may be used by other BFD MIB modules to define management objects.

Meaningful security considerations can only be written in the MIB modules that define management objects. Therefore, this document has no impact on the security of the Internet.

5. 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
     ----------        -----------------------

     bfdTCStdMib            { mib-2 XXX }
      	

[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.]

6. References

6.1. Normative References

6.2. Informative References

Appendix A. Acknowledgments

Authors would like to thank David Ward and Jeffrey Haas for their comments and suggestions.

Authors' Addresses