Multicast Source Discovery Protocol: Difference between revisions

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'''Multicast Source Discovery Protocol''' ('''MSDP''') is a computer [[network protocol]] in the [[Protocol Independent Multicast|Protocol Independent Multicast (PIM)]] family of [[multicast]] [[routing protocol]]s. MSDP may be used with protocols other than PIM-SM.

MSDP interconnects multiple [[IPv4]] [[Sparse multicast|PIM Sparse-Mode (PIM-SM)]] [[Domain name|domains]]. This enables PIM-SM to have Rendezvous Point (RP) [[redundancy (engineering)|redundancy]] and [[inter-___domain]] multicasting. It is defined by Experimental [[Request for Comments|RFC]] 3618.

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).

==External links==

* RFC 3618

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