Unicast-Prefix-based IPv6 Multicast Addresses
RFC 3306
Document | Type | RFC - Proposed Standard (September 2002; No errata) | |
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Authors | Brian Haberman , Brian Haberman , Dave Thaler | ||
Last updated | 2015-10-14 | ||
Stream | Internent Engineering Task Force (IETF) | ||
Formats | plain text html pdf htmlized (tools) htmlized bibtex | ||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 3306 (Proposed Standard) | |
Action Holders |
(None)
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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 |
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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 TShow full document text