I-D ACTION:draft-ietf-ssm-overview-00.txt

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This draft is a work item of the Source-Specific Multicast Working Group of the IETF.

	Title		: An Overview of Source-Specific Multicast(SSM) 
                          Deployment
	Author(s)	: S. Bhattacharyya et al.
	Filename	: draft-ietf-ssm-overview-00.txt
	Pages		: 13
	Date		: 30-May-01
	
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.  The IP address range 232/8 has been designated as SSM
addresses by IANA for IPv4. An SSM address range already exists for
IPv6.  A source S transmits IP datagrams to an SSM address G. A
receiver can receive these datagrams by subscribing to the channel
(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 UDP datagrams is rooted at the source
S. Although a number of protocols exists for constructing source-
rooted forwarding trees, this document discusses the most widely
implemented one - PIM Sparse Mode [PIM-SM-NEW].

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