Which two statements regarding Auto RP operations and implementations are correct? (Choose two.)

Which two statements regarding Auto RP operations and implementations are correct? (Choose two.)
A . Candidate RPs send RP announcements to the 224.0.1.39 multicast group, and the mapping agents send RP discovery messages to the 224.0.1.40 multicast group
B . Every PIM-SM router must be configured with the RP mapping agent IP address
C . Candidate RPs learn the IP address of the mapping agents via periodic RP discovery messages
D . Administrative scoping can be configured to limit the scope of the RP announcements
E . A Reverse Path Forwarding check is done on the RP discovery messages
F .  RP discovery messages are flooded hop by hop throughout the network as multicast to the all PIM routers multicast group with a TTL of 1

View Answer

Answer: A,D

Explanation:

Auto-RP

Automatic route processing (Auto-RP) is a feature that automates the distribution of group-to-RP

mappings in aPIM network. This feature has these benefits:

It is easy to use multiple RPs within a network to serve different group ranges. It allows load splitting among different RPs.

It facilitates the arrangement of RPs according to the location of group participants.

It avoids inconsistent, manual RP configurations that might cause connectivity problems. Multiple RPs can be used to serve different group ranges or to serve as hot backups for each other. To ensurethat Auto-RP functions, configure routers as candidate RPs so that they can announce their interest inoperating as an RP for certain group ranges. Additionally, a router must be designated as an RP-mappingagent that receives the RP-announcement messages from the candidate RPs, and arbitrates conflicts. The RPmappingagent sends the consistent group-to-RP mappings to all remaining routers. Thus, all routersautomatically determine which RP to use for the groups they supportauto-rp candidate-rp

To configure a router as a Protocol Independent Multicast (PIM) rendezvous point (RP) candidate that sendsmessages to the well-known CISCO-RP-ANNOUNCE multicast group (224.0.1.39), use the auto-rp candidaterpcommand in PIM configuration mode. To return to the default behavior, use the no form of this command.auto-rp candidate-rp type interface-path-id scope ttl-value [ group-list access-listname] [ interval seconds ] [bidir]no auto-rp candidate-rp type interface-path-id scope ttl- value [ group-list access-listname] [ interval seconds ] [bidir]