3 good questions on "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):, Static
    RP: (?)
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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