Users Guide
Multicast Source Discovery Protocol (MSDP)
Dell Networking OS supports multicast source discovery protocol (MSDP).
Protocol Overview
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 dened by an exterior gateway protocol, such as border
gateway protocol (BGP).
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.
3 When an MSDP peer receives an SA message, it determines if there are any group members within the domain interested in any of
the advertised sources. If there are, the receiving RP sends a join message to the originating RP, creating a shortest path tree (SPT)
to the source.
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