Multicast Source Discovery Protocol (MSDP)
Another multicast border router protocol is the Multicast Source Discovery Protocol (MSDP). This particular protocol can only be used to connect domains that also use PIM-SM internally. You might find it helpful to review the section,“Protocol Independent Multicast-Sparse Mode (PIM-SM),” in Chapter 2, “Multicast Protocols,” before proceeding. This protocol also utilizes the BGP routing tables rather than building its own for unicast data.
MSDP routers keep a continuous connection open to their neighbors, or peers, using TCP. A KeepAlive timer is used to check whether KeepAlive messages arrive within specified intervals, though these messages are not sent unless no Source-Active (SA) messages have arrived ...
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