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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.

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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", "...