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An Overview of Source-Specific Multicast (SSM) (RFC3569)

IP.com Disclosure Number: IPCOM000016638D
Original Publication Date: 2003-Jul-01
Included in the Prior Art Database: 2003-Jul-08
Document File: 15 page(s) / 29K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

S. Bhattacharyya: AUTHOR [+2]

Abstract

The purpose of this document is to provide an overview of Source-Specific Multicast (SSM) and issues related to its deployment. It discusses how the SSM service model addresses the challenges faced in inter-domain multicast deployment, changes needed to routing protocols and applications to deploy SSM and interoperability issues with current multicast service models.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 10% of the total text.

Network Working Group                              S. Bhattacharyya, Ed.

Request for Comments: 3569                                        Sprint

Category: Informational                                        July 2003

             An Overview of Source-Specific Multicast (SSM)

Status of this Memo

   This memo provides information for the Internet community.  It does

   not specify an Internet standard of any kind.  Distribution of this

   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2003).  All Rights Reserved.

Abstract

   The purpose of this document is to provide an overview of

   Source-Specific Multicast (SSM) and issues related to its deployment.

   It discusses how the SSM service model addresses the challenges faced

   in inter-domain multicast deployment, changes needed to routing

   protocols and applications to deploy SSM and interoperability issues

   with current multicast service models.

1.  Introduction

   This document provides an overview of the Source-Specific Multicast

   (SSM) service and its deployment using the PIM-SM and IGMP/MLD

   protocols.  The network layer service provided by SSM is a "channel",

   identified by an SSM destination IP address (G) and a source IP

   address S.  An IPv4 address range has been reserved by IANA for use

   by the SSM service.  An SSM destination address range already exists

   for IPv6.  A source S transmits IP datagrams to an SSM destination

   address G.  A receiver can receive these datagrams by subscribing to

   the channel (Source, Group) or (S,G).  Channel subscription is

   supported by version 3 of the IGMP protocol for IPv4 and version2 of

   the MLD protocol for IPv6.  The interdomain tree for forwarding IP

   multicast datagrams is rooted at the source S, and is constructed

   using the PIM Sparse Mode [9] protocol.

   This document is not intended to be a standard for Source-Specific

   Multicast (SSM).  Instead, its goal is to serve as an introduction to

   SSM and its benefits for anyone interested in deploying SSM services.

   It provides an overview of SSM and how it solves a number of problems

   faced in the deployment of inter-domain multicast.  It outlines

   changes to protocols and applications both at end-hosts and routers

Bhattacharyya                Informational                      [Page 1]

RFC 3569                   An Overview of SSM                  July 2003

   for supporting SSM, with pointers to more detailed documents where

   appropriate.  Issues of interoperability with the multicast service

   model defined by RFC 1112 are also discussed.

   This memo is a product of the Source-Specific Multicast (SSM) Working

   Group of the Internet Engineering Task Force.

   The keywords "MUST"", "MUST NOT", "REQUIRED", "...