Reference Guide

Multicast Source Discovery Protocol | 611
To configure Anycast RP:
Reducing Source-active Message Flooding
RPs flood source-active messages to all of their peers away from the RP. When multiple RPs exist within a
domain, the RPs forward received active source information back to the originating RP, which violates the
RFP rule. You can prevent this unnecessary flooding by creating a mesh-group. A mesh in this context is a
topology in which each RP in a set of RPs has a peership with all other RPs in the set. When an RP is a
member of the mesh group, it forwards active source information only to its peers outside of the group.
Specify the RP Address Used in SA Messages
The default originator-id is the address of the RP that created the message. In the case of Anycast RP, there
are multiple RPs all with the same address. You can use the (unique) address of another interface as the
originator-id.
R1 Configuration for MSDP with Anycast RP
ip multicast-routing
!
interface GigabitEthernet 1/1
ip pim sparse-mode
ip address 10.11.3.1/24
no shutdown
!
Step Task Command Syntax Command Mode
1 In each routing domain that will have multiple RPs serving a
group, create a loopback interface on each RP serving the
group with the same IP address.
interface loopback CONFIGURATION
2 Make this address the RP for the group. ip pim rp-address CONFIGURATION
3 In each routing domain that will have multiple RPs serving a
group, create another loopback interface on each RP serving
the group with a unique IP address.
interface loopback CONFIGURATION
4 Peer each RP with every other RP using MSDP, specifying the
unique loopback address as the connect-source.
ip msdp peer CONFIGURATION
5 Advertise the network of each of the unique loopback
addresses throughout the network.
network ROUTER OSPF
Task Command Syntax Command Mode
Create a mesh group. ip msdp mesh-group CONFIGURATION
Task Command Syntax Command Mode
Use the address of another interface as the originator-id instead of the RP address. ip msdp originator-id CONFIGURATION