Company XYZ has a multicast domain that spans across multiple autonomous systems. The company wants to choose a technology that provides a simplified and controlled approach to interconnecting the…

PIM SSM bypasses the RP entirely and functions within a single domain, providing no mechanism to interconnect or discover sources across separate multicast autonomous systems.

Multicast Source Discovery Protocol (MSDP) enables Rendezvous Points (RPs) in separate PIM-SM domains and autonomous systems to exchange Source Active (SA) messages, advertising active multicast sources to neighboring domains. This provides a straightforward and controlled method for inter-AS multicast connectivity without requiring a single shared RP across all domains. MSDP is the standard solution for interconnecting independent multicast routing domains at AS boundaries.

PIM sparse mode operates within a single PIM domain using a shared RP and does not natively address spanning multicast routing across multiple autonomous systems.

MPLS is a packet-forwarding and traffic engineering technology that does not provide multicast source discovery or domain interconnection across autonomous systems.