URL:
http://www.ietf.org/rfc/rfc2362.txt
PIM-SM is a protocol for efficiently routing to
multicast groups that may span wide-area (and inter-domain) internets. It is
named Protocol Independent Multicast--Sparse Mode (PIM-SM) because it is not
dependent on any particular unicast routing protocol, and because it is designed
to support sparse multicast groups within the network.
Keywords:
Internet, routing, multicast.
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