Network Working Group K. Fujisawa
Request for Comments: 3146 A. Onoe
Category: Standards Track Sony Corporation
October 2001
Transmission of IPv6 Packets over IEEE 1394 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 (2001). All Rights Reserved.
Abstract
This document describes the frame format for transmission of IPv6
packets and the method of forming IPv6 link-local addresses and
statelessly autoconfigured addresses on IEEE1394 networks.
1. INTRODUCTION
IEEE Std 1394-1995 (and its amendment) is a standard for a High
Performance Serial Bus. IETF IP1394 Working Group has standardized
the method to carry IPv4 datagrams and ARP packets over IEEE1394
subnetwork [IP1394].
This document describes the frame format for transmission of IPv6
[IPV6] packets and the method of forming IPv6 link-local addresses
and statelessly autoconfigured addresses on IEEE1394 networks. It
also describes the content of the Source/Target Link-layer Address
option used in Neighbor Discovery [DISC] when the messages are
transmitted on an IEEE1394 network.
2. SPECIFICATION TERMINOLOGY
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.
Fujisawa & Onoe Standards Track [Page 1]
RFC 3146 IPv6 Packets over IEEE 1394 Networks October 2001
3. IPv6-CAPABLE NODES
An IPv6-capable node MUST fulfill the following minimum requirements:
- it MUST implement configuration ROM in the general format
specified by ISO/IEC 13213:1994 and MUST implement the bus
information block specified by IEEE Std 1394a-2000 [1394a] and a
unit directory specified by this document;
- the max_rec field in its bus information block MUST be at least 8;
this indicates an ability to accept block write requests and
asynchronous stream packets with data payload of 512 octets. The
same ability MUST also apply to read requests; that is, the node
MUST be able to transmit a block response packet with a data
payload of 512 octets;
- it MUST be isochronous resource manager capable, as specified by
IEEE Std 1394a-2000;
- it MUST support both reception and transmission of asynchronous
streams as specified by IEEE Std 1394a-2000.
4. LINK ENCAPSULATION AND FRAGMENTATION
The encapsulation and fragmentation mechanism MUST be the same as "4.
LINK ENCAPSULATION AND FRAGMENTATION" of [IP1394].
Note: Since there is an ether_type field to discriminate protocols
and MCAP (multicast channel allocation protocol) is used for both
IPv4 and IPv6, the version field in GASP (global asynchronous
stream packet) header of IPv6 datagrams is the same value (one) as
[IP1394].
The ether_type value for IPv6 is 0x86dd.
The default MTU size for IPv6 packets on an IEEE1394 network is 1500
octets. This size may be reduced by a Router Advertisement [DISC]
containing an MTU option which specifies a smaller MTU, or by manual
configuration of each node. If a Router Advertisement received on an
IEEE1394 interface has an MTU option specifying an MTU larger than
1500, or larger than a manually configured value, that MTU option may
be logged to system management but MUST be otherwise ignored. The
mechanism to extend MTU size between particular two nodes is for
further study.
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RFC 3146 IPv6 Packets over IEEE 1394 Networks October 2001
5. CONFIGURATION ROM
Configuration ROM for IPv6-capable nodes MUST contain a unit
directory in the format specified by [IP1394] except following rules.
- The value for Unit_SW_Version is 0x000002.
- The textual descriptor for the Unit_SW_Version MUST be "IPv6".
Note: A dual-stack (IPv4 and IPv6) node will have two unit
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