[Live-devel] consistent combinations for streaming

Ross Finlayson finlayson at live.com
Mon Feb 9 14:24:49 PST 2004

To answer one of these questions:

"SSM" stands for "Source-Specific Multicast" - a new variant of IP 
multicast in which:
	(i) all multicast communication is one-way, from a single source to 
(potentially) multiple receivers, and
	(ii) the communication channel is identified not just by a multicast group 
address, but instead by the combination of the multicast group address and 
the address of the (single) source.
I.e., a receiver doesn't just join the multicast group address, but the 
multicast group address in combination with a specific sender.  This 
simplifies inter-domain multicast routing, because the source address of 
the stream is specifically identified.  (However, within a single LAN, the 
regular multicast join operation will also work.)

For more information about SSM, see <http://www.ietf.org/rfc/rfc3569.txt>

	Ross Finlayson

More information about the live-devel mailing list