Multicast Source Discovery Protocol
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Multicast Source Discovery Protocol (MSDP) is a computer network protocol in the Protocol Independent Multicast (PIM) family of multicast routing protocols. MSDP may be used with protocols other than PIM-SM.
MSDP interconnects multiple IPv4 PIM Sparse-Mode (PIM-SM) domains. This enables PIM-SM to have Rendezvous Point (RP) redundancy and interdomain multicasting. It is defined by Experimental RFC 3618.