Multicast Source Discovery Protocol: Difference between revisions

Revision as of 10:11, 8 August 2009

Revision as of 00:18, 6 March 2010

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'''Multicast Source Discovery Protocol''' ('''MSDP''') is a [[Protocol Independent Multicast|Protocol Independent Multicast]] (PIM) family [[multicast]] [[routing protocol]] defined by Experimental RFC 3618. MSDP interconnects multiple [[IPv4]] [[Sparse multicast|PIM Sparse-Mode]] (PIM-SM) [[Domain name|domains]] which enables PIM-SM to have Rendezvous Point (RP) [[redundancy (engineering)|redundancy]] and [[inter-___domain]] multicasting.

MSDP uses TCP as its transport protocol. Each multicast tree has to have its own RP. All of the RPs are peers (directly or through other MSDP peers). Messages contain Source of Data, Group Address The Data Source Sends To (S,G). If an RP on its own ___domain receives a message it determines if there are group members on this ___domain interested in a multicast. If someone is interested it triggers a join towards the data source (into the source ___domain) in the way of (S, G). In a peering relationship, one MSDP peer listens for new TCP connections on the well-known port 639.