Reserved Type, Length and Value (TLV) Codepoints in

Intermediate System to Intermediate System

Status of this Memo

This memo provides information for the Internet community. It does not specify an Internet standard of any kind. Distribution of this memo is unlimited.

Copyright Notice

Copyright © The Internet Society (2002). All Rights Reserved.

Abstract

This document describes implementation codepoints within Intermediate System to Intermediate System (IS-IS) used today by several ISPs for routing within their clouds. IS-IS is an interior gateway routing protocol developed originally by OSI and used with IP extensions as Interior Gateway Protocol (IGP). This document summarizes all Table, Length and Value (TLV) codepoints that are being used by the protocol and its pending extensions.

1. TLV Codepoints Reserved

_____________________________________________________________________

    Name                    Value  IIH   LSP   SNP  Status
   
   _____________________________________________________________________
   
    Area Addresses            1  y     y     n    ISO 10589
    IIS Neighbors             2  n     y     n    ISO 10589
    ES Neighbors              3  n     y     n    ISO 10589
    Part. DIS                 4  n     y     n    ISO 10589
    Prefix Neighbors          5  n     y     n    ISO 10589
    IIS Neighbors             6  y     n     n    ISO 10589
    Padding                   8  y     n     n    ISO 10589
    LSP Entries               9  n     n     y    ISO 10589
    Authentication           10  y     y     y    ISO 10589
    Opt. Checksum            12  y     n     y    IETF-draft
    LSPBufferSize            14  n     y     n    ISO 10589 Rev 2 Draft
    TE IIS Neigh.            22  n     y     n    IETF-draft
    DECnet Phase IV          42  y     n     n    DEC (ancient)
    Lucent Proprietary       66  n     y     n
    IP Int. Reach           128  n     y     n    RFC 1195
    Prot. Supported         129  y     y     n    RFC 1195
    IP Ext. Address         130  n     y     n    RFC 1195
    IDRPI                   131  n     y     y    RFC 1195
    IP Intf. Address        132  y     y     n    RFC 1195
    Illegal                 133  n     n     n    RFC 1195 (not used)
    Router ID               134  n     y     n    IETF-draft
    TE IP. Reach            135  n     y     n    IETF-draft
    Dynamic Name            137  n     y     n    RFC 2763
    Nortel Proprietary      176  n     y     n
    Nortel Proprietary      177  n     y     n
    Restart TLV             211  y     n     n    IETF-draft
    MT-ISN                  222  n     y     n    IETF-draft
    M-Topologies            229  y     y     n    IETF-draft
    IPv6 Intf. Addr.        232  y     y     n    IETF-draft
    MT IP. Reach            235  n     y     n    IETF-draft
    IPv6 IP. Reach          236  n     y     n    IETF-draft
    MT IPv6 IP. Reach       237  n     y     n    IETF-draft
    P2P Adjacency State     240  y     n     n    IETF-draft

2. Assignment Procedures

This document is provided to avoid possible future conflicts in the assignment of TLV numbers. It does not constitute or represent any standard or authority assigning TLV numbers. TLV assignment happens on a shared, informational basis between the ISO, SIF and the IETF working groups. The core ISIS protocol is being specified in the ISO standards body, IP extensions to it however are products of the ISIS working group in IETF. Since ISO does not provide a numbering authority and IANA is only responsible for IP related coding points, no plausible central authority to assign TLV numbers exists as of today.

This document will be periodically updated by newer versions in the fashion of [RP94] and successors. It may be replaced at any given point in time by some type of official registry.

This document will not indicate specific documents using the codepoints, nor will it resolve the sub-TLV codepoints.

3. Acknowledgments

Thanks to Les Ginsberg and others for pointing out details and improving this work.

4. Security Consideration

ISIS security applies to the work presented. No specific security issues are being introduced.

5. References

[Cal90a] R. Callon. OSI ISIS Intradomain Routing Protocol.

INTERNET-RFC, Internet Engineering Task Force, February 1990.

[Cal90b] R. Callon. Use of OSI ISIS for Routing in TCP/IP and Dual

Environments. INTERNET-RFC, Internet Engineering Task Force, December 1990.

   [ISO90]  ISO.  Information Technology - Telecommunications and
            Information Exchange between Systems - Intermediate System
            to Intermediate System Routing Exchange Protocol for Use in
            Conjunction with the Protocol for Providing the
            Connectionless-Mode Network Service.  ISO, 1990.
   
   [RP94]   Reynolds, J., "Assigned Numbers; RFC 1700 is Replaced by an
            On-line Database", RFC 3232, January, 2002.

6. Authors' Addresses

Tony Przygienda
Xebeo
One Cragwood Road
South Plainfield, NJ 07080

   Phone: (908) 222 4225
   Email: prz@xebeo.com

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Acknowledgement

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