MSDP
Multicast Source Discovery Protocol
draft-ietf-msdp-spec-xx
Allows each domain to control its own RP(s)
Interconnect RPs between domains with TCP connections to pass
source active messages (SAs)
Can also be used within a domain to provide RP redundancy
(Anycast-RP)
RPs send SA messages for internal sources to MSDP peers
SAs are Peer-RPF checked before accepting or forwarding
RPs learn about external sources via SA messages and may trigger
(S,G)joins on behalf of local receivers
MSDP connections typically parallel MBGP connections