MSDP Peers
MSDP establishes a neighbor relationship between
MSDP peers
Peers connect using TCP port 639
Peers send keepalives every 60 secs (fixed)
Peer connection reset after 75 seconds if no MSDP packets or
keepalives are received
MSDP peers must run mBGP!
May be an MBGP peer, a BGP peer or both
Required for peer-RPF checking of the RP address in the SA
to prevent SA looping
Exception: BGP is unnecessary when
peering with only a single MSDP peer (default-peer)