RFC 2470 (rfc2470) - Page 1 of 11

Transmission of IPv6 Packets over Token Ring Networks

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Network Working Group                                       M. Crawford
Request for Comments: 2470                                     Fermilab
Category: Standards Track                                     T. Narten
                                                                    IBM
                                                              S. Thomas
                                                             TransNexus
                                                          December 1998


         Transmission of IPv6 Packets over Token Ring Networks

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.

1.  Introduction

   This memo specifies the MTU and frame format for transmission of IPv6
   packets on Token Ring networks. It also specifies the method of
   forming IPv6 link-local addresses on Token Ring networks and the
   content of the Source/Target Link-layer Address option used the
   Router Solicitation, Router Advertisement, Redirect, Neighbor
   Solicitation and Neighbor Advertisement messages when those messages
   are transmitted on a Token Ring network.

   Implementors should be careful to note that Token Ring adaptors
   assume addresses are in non-canonical rather than canonical format,
   requiring that special care be taken to insure that addresses are
   processed correctly. See [CANON] for more details.

   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 [KWORD].

2.  Maximum Transmission Unit

   IEEE 802.5 networks have a maximum frame size based on the maximum
   time a node may hold the token. This time depends on many factors
   including the data signaling rate and the number of nodes on the
   ring. Because the maximum frame size varies, implementations must



Crawford, et. al.           Standards Track
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