Home » Cisco » 350-080 » What is the benefit of using Anycast RP via RFC 4610 for IP multicast RP redundancy?
What is the benefit of using Anycast RP via RFC 4610 for IP multicast RP redundancy?
A. Improves convergence of the multicast network due to enhanced RPF checks
B. Simplifies the number of control plane protocols over other RP redundancy methods
C. Eliminates the use of Protocol Independent Multicast (PIM) in the topology
D. Increases the administrative distances in Multicast Source Discovery Protocol (MSDP) configuration
Correct Answer: B
Explanation/Reference:
Explanation:
Anycast-RP has two implementations: one uses Multicast Source Discovery Protocol (MSDP) and the other is based on RFC 4610, Anycast-RP Using Protocol Independent Multicast (PIM). This section describes how to configure PIM Anycast-RP.
You can use PIM Anycast-RP to assign a group of routers, called the Anycast-RP set, to a single RP address that is configured on multiple routers. The set of routers that you configure as Anycast-RPs is called the Anycast-RP set. This method is the only RP method that supports more than one RP per multicast group, which allows you to load balance across all RPs in the set. The Anycast RP supports all multicast groups.
PIM register messages are sent to the closest RP and PIM join-prune messages are sent in the direction of the closest RP as determined by the unicast routing protocols. If one of the RPs goes down, unicast routing ensures these message will be sent in the direction of the next-closest RP.
You must Ethernet PIM on the loopback interface that is used for the PIM Anycast RP.
Reference: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/5_x/nx-os/multicast/configuration/guide/n7k_multic_cli_5x/pim.html (anycast-RP)
