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Juniper Networks® Field Guide and Reference by Juniper Networks®, Cris Morris, Gary Drenan, Aviva Garrett

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MSDP

Multicast Source Discovery Protocol (MSDP) is used to interconnect multicast routing domains. It is typically run on the same router as the PIM sparse-mode rendezvous point (RP). Each MSDP router establishes adjacencies with internal and external MSDP peers similar to BGP. These peer routers inform each other about active sources within the domain. When they detect active sources, the routers can send PIM sparse-mode explicit join messages to the active source. The peer with the higher IP address passively listens to a well-known port number and waits for the side with the lower IP address to establish a TCP connection. When a PIM sparse-mode RP that is running MSDP becomes aware of a new local source, it sends source-active TLVs to its ...

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