IP Multicast Routing - Sparse-Mode Routing Protocols - Dynamically Finding RPs and Using Redundant RPs

3 important questions on IP Multicast Routing - Sparse-Mode Routing Protocols - Dynamically Finding RPs and Using Redundant RPs

What is the command to check which RP is used?


R2#show ip pim rp mapping
PIM Group-to-RP Mappings

Group(s): 224.0.0.0/4, Static
    RP: 1.1.1.1 (?)

What is the advantage of using anycast RP? 2

-Multiple RP share load for single multicast group
-Fast recovery after failed RP

Why is MSDP necessary if anycast is used with two RP's?

Because a source may register with one RP and receivers may
join to a different RP, a method is needed for the RPs to exchange information about active sources. This information exchange is done with MSDP.

This feature is used in intradomain multicast routing

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