Source-Specific Multicast (ssm)

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NOTE: This charter is a snapshot of the 60th IETF Meeting in San Diego, California USA. It may now be out-of-date.

Last Modified: 2004-06-14

Hugh Holbrook <>
Supratik Bhattacharya <>
Routing Area Director(s):
Bill Fenner <>
Alex Zinin <>
Routing Area Advisor:
Bill Fenner <>
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Description of Working Group:
The purpose of the SSM working group is to define source-specific multicast in order to provide unambiguous semantics to the designers of the protocols and host interfaces used in conjunction with source-specific multicast.

SSM is intended to be a short-lived and highly-focused working group.

The working group has two specific tasks:

1) A concise standards-track RFC that clearly defines the source-specific multicast model and its relation to RFC 1112 multicast. This document will specify of the host interfaces to be used for source-specific multicast, the rules that hosts, routers, and protocols must follow when allocating and using source-specific addresses. This document will serve as a reference to RFC authors designing protocols and host interfaces that implement SSM.

2) An informational RFC providing an overview of source-specific multicast. This document will serve as a starting point for parties interested in source-specific multicast.

Other SSM-related documents may be taken on as work items by other multicast working groups that have more specific expertise, including pim, mboned, and magma. For instance, a document describing the use of IGMPv3 for SSM has been adopted by MAGMA. The SSM working group chairs will cooperate with chairs of the related working groups and the Area Directors to determine the appropriate location of SSM-related documents that arise during the working group's lifetime.

Goals and Milestones:
Done  First meeting
Done  Submit source-specific multicast model as internet-draft
Done  Submit I-D for source-specific multicast
Done  Reach consensus on source-specific multicast model and alloctate address space to source-specific multicast
Done  Submit I-D on source-specific multicast deployment to IESG for consideration as an Informational RFC
Mar 04  Submit I-Ds on source-specific multicast model and alloctate address space to source-specific multicast to IESG for consideration as a Standards-track RFC
  • - draft-ietf-ssm-arch-05.txt
  • Request For Comments:
    RFC3569 I An Overview of Source-Specific Multicast(SSM)

    Current Meeting Report

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