An organization plans to deploy multicast across two different autonomous systems. Their solution must allow RPs to: - discover active sources outside their domain - use the underlying routing…

Question

Options

• AMSDP
• BSSM
• CPIM-SM
• DPIM-DM

• A
  81% (47)
• B
  5% (3)
• C
  3% (2)
• D
  10% (6)

Explanation

MSDP (Multicast Source Discovery Protocol) is the standard solution for inter-domain multicast source discovery. MSDP allows Rendezvous Points (RPs) in different autonomous systems to peer with each other (using TCP sessions) and exchange Source Active (SA) messages, which announce active multicast sources in their domain. When a source registers with its local RP, that RP sends an SA message to its MSDP peers, enabling RPs in other ASes to discover and join traffic from external sources. MSDP uses the underlying unicast routing table (BGP) for connectivity between RPs. PIM-SM (C) is an intra-domain protocol and does not facilitate inter-domain RP source discovery on its own. SSM (B) eliminates the need for an RP by using source-specific channels, but it requires receivers to already know the source address-it does not provide source discovery. PIM-DM (D) uses flood-and-prune within a single domain and is not suitable for inter-AS deployments.

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