A. Multiple domains can have a single statically defined RP.
B. RPs interconnect between domains with UDP connections to pass source active messages.
C. RPs interconnect between domains with TCP connections to pass source active messages.
D. RPs send source active messages for internal sources to MSDP peers.
E. Source active messages are Peer-RPF checked before accepting or forwarding.
F. RPs learn about external sources via source active messages and may trigger (S,G) joins on behalf of local receivers.
G. MSDP connections typically parallel PIM-SM connections.