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RIP Version 2
RFC 2453

Document type: RFC - Internet Standard (November 1998; Errata)
Updated by RFC 4822
Obsoletes RFC 1723
Also Known As STD 56
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: (None)
Document shepherd: No shepherd assigned

IESG State: RFC 2453 (Internet Standard)
Responsible AD: (None)
Send notices to: No addresses provided

Network Working Group                                          G. Malkin
Request for Comments: 2453                                  Bay Networks
Obsoletes: 1723, 1388                                      November 1998
STD: 56
Category: Standards Track

                             RIP Version 2

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (1998).  All Rights Reserved.

Abstract

   This document specifies an extension of the Routing Information
   Protocol (RIP), as defined in [1], to expand the amount of useful
   information carried in RIP messages and to add a measure of security.

   A companion document will define the SNMP MIB objects for RIP-2 [2].
   An additional document will define cryptographic security
   improvements for RIP-2 [3].

Acknowledgements

   I would like to thank the IETF RIP Working Group for their help in
   improving the RIP-2 protocol. Much of the text for the background
   discussions about distance vector protocols and some of the
   descriptions of the operation of RIP were taken from "Routing
   Information Protocol" by C. Hedrick [1]. Some of the final editing on
   the document was done by Scott Bradner.

Malkin                      Standards Track                     [Page 1]
RFC 2453                     RIP Version 2                 November 1998

Table of Contents

   1.  Justification  . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Current RIP  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Basic Protocol . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.1   Introduction   . . . . . . . . . . . . . . . . . . . . . . .  3
   3.2   Limitations of the Protocol  . . . . . . . . . . . . . . . .  5
   3.3.  Organization of this document  . . . . . . . . . . . . . . .  6
   3.4   Distance Vector Algorithms . . . . . . . . . . . . . . . . .  6
   3.4.1    Dealing with changes in topology  . . . . . . . . . . . . 12
   3.4.2    Preventing instability  . . . . . . . . . . . . . . . . . 13
   3.4.3    Split horizon . . . . . . . . . . . . . . . . . . . . . . 15
   3.4.4    Triggered updates . . . . . . . . . . . . . . . . . . . . 17
   3.5   Protocol Specification   . . . . . . . . . . . . . . . . . . 18
   3.6   Message Format . . . . . . . . . . . . . . . . . . . . . . . 20
   3.7   Addressing Considerations  . . . . . . . . . . . . . . . . . 22
   3.8   Timers . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
   3.9   Input Processing . . . . . . . . . . . . . . . . . . . . . . 25
   3.9.1    Request Messages  . . . . . . . . . . . . . . . . . . . . 25
   3.9.2    Response Messages . . . . . . . . . . . . . . . . . . . . 26
   3.10  Output Processing  . . . . . . . . . . . . . . . . . . . . . 28
   3.10.1   Triggered Updates . . . . . . . . . . . . . . . . . . . . 29
   3.10.2   Generating Response Messages. . . . . . . . . . . . . . . 30
   4.  Protocol Extensions  . . . . . . . . . . . . . . . . . . . . . 31
   4.1   Authentication . . . . . . . . . . . . . . . . . . . . . . . 31
   4.2   Route Tag  . . . . . . . . . . . . . . . . . . . . . . . . . 32
   4.3   Subnet Mask  . . . . . . . . . . . . . . . . . . . . . . . . 32
   4.4   Next Hop . . . . . . . . . . . . . . . . . . . . . . . . . . 33
   4.5   Multicasting . . . . . . . . . . . . . . . . . . . . . . . . 33
   4.6   Queries  . . . . . . . . . . . . . . . . . . . . . . . . . . 33
   5.  Compatibility  . . . . . . . . . . . . . . . . . . . . . . . . 34
   5.1   Compatibility Switch . . . . . . . . . . . . . . . . . . . . 34
   5.2   Authentication . . . . . . . . . . . . . . . . . . . . . . . 34
   5.3   Larger Infinity  . . . . . . . . . . . . . . . . . . . . . . 35
   5.4   Addressless Links  . . . . . . . . . . . . . . . . . . . . . 35
   6.  Interaction between version 1 and version 2  . . . . . . . . . 35
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 36
   Appendices . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
   References . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 38
   Full Copyright Statement . . . . . . . . . . . . . . . . . . . . . 39

Malkin                      Standards Track                     [Page 2]
RFC 2453                     RIP Version 2                 November 1998

1.  Justification

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