QuestionQ193

Network Design

A multicast network uses Bidirectional PIM. Which two combined actions provide high availability, allowing two RPs in the same network to operate redundantly?

Choose two
  • A Advertise the two RP addresses in the routing protocol.
  • B Use two phantom RP addresses.
  • C Manipulate the multicast routing table by creating static mroutes to the two RPs.
  • D Control routing to the two RPs through a longest match prefix.
  • E Use Anycast RP based on MSDP peering between the two RPs.
  • F Manipulate the administrative distance of the unicast routes to the two RPs.
Explanation

Bidirectional PIM supports redundant RPs through a phantom RP: an unassigned but reachable RP address serves as the common shared-tree root. Candidate RPs advertise routes that cover that address using different prefix lengths; longest-prefix matching selects the active RP, and routing convergence selects the backup after a failure.

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