Unicast-Prefix-based IPv6 Multicast Addresses
RFC 3306
| Document | Type | RFC - Proposed Standard (September 2002; No errata) | |
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Stream | IETF | ||
| Formats | plain text html pdf htmlized bibtex | ||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 3306 (Proposed Standard) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Allison Mankin | ||
| IESG note |
After a lot of effort by IANA/Thomas, this was published as RFC 3306 2002-09-04 [note from Allison] Responsible: Finished |
||
| Send notices to | <mrw@windriver.com> | ||
Network Working Group B. Haberman
Request for Comments: 3306 Consultant
Category: Standards Track D. Thaler
Microsoft
August 2002
Unicast-Prefix-based IPv6 Multicast Addresses
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 (2002). All Rights Reserved.
Abstract
This specification defines an extension to the multicast addressing
architecture of the IP Version 6 protocol. The extension presented
in this document allows for unicast-prefix-based allocation of
multicast addresses. By delegating multicast addresses at the same
time as unicast prefixes, network operators will be able to identify
their multicast addresses without needing to run an inter-domain
allocation protocol.
Table of Contents
1. Introduction....................................................2
2. Motivation......................................................2
3. Terminology.....................................................2
4. Multicast Address Format........................................2
5. Address Lifetime................................................4
6. Source-Specific Multicast Addresses.............................4
7. Examples........................................................4
8. Security Considerations.........................................5
9. References......................................................5
Author's Address...................................................6
Full Copyright Statement...........................................7
Haberman & Thaler Standards Track [Page 1]
RFC 3306 Unicast-Prefix-based IPv6 Multicast August 2002
1. Introduction
This document specifies an extension to the multicast portion of the
IPv6 addressing architecture [ADDRARCH]. The current architecture
does not contain any built-in support for dynamic address allocation.
This proposal introduces encoded information in the multicast address
to allow for dynamic allocation of IPv6 multicast addresses and IPv6
source-specific multicast addresses.
2. Motivation
The current IPv4 multicast address allocation architecture [RFC 2908]
is based on a multi-layered, multi-protocol system. The goal of this
proposal is to reduce the number of protocols that need to be
deployed in order to get dynamic multicast address allocation.
The use of unicast prefix-based multicast address allocation will, at
a minimum, remove the need to run the Multicast Address Allocation
Protocol (AAP) [AAP WORK] and the Multicast Address-Set Claim (MASC)
Protocol [RFC 2909].
3. 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].
4. Multicast Address Format
Section 2.7 of [ADDRARCH] defines the following operational format of
IPv6 multicast addresses:
| 8 | 4 | 4 | 112 |
+--------+----+----+---------------------------------------------+
|11111111|flgs|scop| group ID |
+--------+----+----+---------------------------------------------+
Haberman & Thaler Standards Track [Page 2]
RFC 3306 Unicast-Prefix-based IPv6 Multicast August 2002
This document introduces a new format that incorporates unicast
prefix information in the multicast address. The following
illustrates the new format:
| 8 | 4 | 4 | 8 | 8 | 64 | 32 |
+--------+----+----+--------+--------+----------------+----------+
|11111111|flgs|scop|reserved| plen | network prefix | group ID |
+--------+----+----+--------+--------+----------------+----------+
+-+-+-+-+
flgs is a set of 4 flags: |0|0|P|T|
+-+-+-+-+
o P = 0 indicates a multicast address that is not assigned
based on the network prefix. This indicates a multicast
address as defined in [ADDRARCH].
o P = 1 indicates a multicast address that is assigned based
on the network prefix.
o If P = 1, T MUST be set to 1, otherwise the setting of the T
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