300-320 · Question #279
In which multicast configuration is MSDP most useful?
The correct answer is A. interdomain. MSDP (Multicast Source Discovery Protocol) was designed to allow Rendezvous Points (RPs) in separate PIM-SM domains to share information about active multicast sources. Within a single PIM-SM domain, all routers share the same RP and can reach sources natively - MSDP is…
Question
In which multicast configuration is MSDP most useful?
Options
- Ainterdomain
- Bintradomain
- Cdata center
- Dcampus
How the community answered
(21 responses)- A90% (19)
- B5% (1)
- C5% (1)
Explanation
MSDP (Multicast Source Discovery Protocol) was designed to allow Rendezvous Points (RPs) in separate PIM-SM domains to share information about active multicast sources. Within a single PIM-SM domain, all routers share the same RP and can reach sources natively - MSDP is unnecessary. However, across different administrative or routing domains (interdomain), each domain has its own RP with no visibility into sources in other domains. MSDP enables an RP to learn about active sources in remote domains, allowing receivers in one domain to receive traffic from sources in another. This makes it most useful in interdomain (A) multicast deployments, such as the now-defunct MBONE or enterprise-to-ISP multicast peering.
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