RFC 2467 (rfc2467) - Page 1 of 9
Transmission of IPv6 Packets over FDDI Networks
Alternative Format: Original Text Document
Network Working Group M. Crawford
Request for Comments: 2467 Fermilab
Obsoletes: 2019 December 1998
Category: Standards Track
Transmission of IPv6 Packets over FDDI 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 document specifies the frame format for transmission of IPv6
packets and the method of forming IPv6 link-local addresses and
statelessly autoconfigured addresses on FDDI networks. It also
specifies the content of the Source/Target Link-layer Address option
used in Router Solicitation, Router Advertisement, Neighbor
Solicitation, Neighbor Advertisement and Redirect messages when those
messages are transmitted on an FDDI network.
This document replaces RFC 2019, "Transmission of IPv6 Packets Over
FDDI", which will become historic.
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 [RFC 2119].
2. Maximum Transmission Unit
FDDI permits a frame length of 4500 octets (9000 symbols), including
at least 22 octets (44 symbols) of Data Link encapsulation when
long-format addresses are used. Subtracting 8 octets of LLC/SNAP
header, this would, in principle, allow the IPv6 [IPV6] packet in the
Information field to be up to 4470 octets. However, it is desirable
to allow for the variable sizes and possible future extensions of the
MAC header and frame status fields. The default MTU size for IPv6
packets on an FDDI network is therefore 4352 octets. This size may
be reduced by a Router Advertisement [DISC] containing an MTU option
Crawford Standards Track