CCDE: Cisco Certified Design Expert (Practical) — Question 14

A multicast network is using Bidirectional PIM. Which two combined actions achieve high availability so that two RPs within the same network can act in a redundant manner? (Choose two.)

Answer options

• 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.

Correct answer: B, D

Explanation

Using phantom RP addresses allows both RPs to be available without conflicts in a multicast network, which contributes to redundancy. Controlling routing to the RPs through a longest match prefix ensures that traffic is efficiently directed to the appropriate RP, enhancing reliability. The other options either do not directly contribute to redundancy or are not applicable in this context.