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Multicast Source Discovery Protocol
(MSDP)
Multicast Source Discovery Protocol (MSDP) is a Layer 3 protocol that connects IPv4 protocol-independent
multicast-sparse mode (PIM-SM) domains. A domain in the context of MSDP is a contiguous set of routers
operating PIM within a common boundary defined by an exterior gateway protocol, such as border gateway
protocol (BGP).
Protocol Overview
Each rendezvous point (RP) peers with every other RP via the transmission control protocol (TCP). Through
this connection, peers advertise the sources in their domain.
1 When an RP in a PIM-SM domain receives a PIM register message from a source, it sends a source-active
(SA) message to MSDP peers, as shown in the following illustration.
2 Each MSDP peer receives and forwards the message to its peers away from the originating RP.
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Multicast Source Discovery Protocol (MSDP) 653