Designating the Interface IP Address as the RP IP Address

When an RP receives a Source Active message, it checks its PIM Sparse multicast group table for receivers for the group. If a receiver exists the RP sends a Join to the source.

By default, the IP address included in the RP address field of the SA message is the IP address of the originating RP. An SA message can use the IP address of any interface on the originating RP. (The interface is usually a loopback interface.)

To designate an interface IP address to be the IP address of the RP, enter commands such as the following. 

device(config)# interface loopback 2
device(config-lbif-2)# ip address 2.2.1.99/32
device(config)# router msdp
device(config-msdp-router)# originator-id loopback 2
device(config-msdp-router)# exit

To specify VRF information, enter the following commands at the MSDP VRF configuration level. 

device(config)# interface loopback 2
device(config-lbif-2)# ip address 2.2.1.99/32
device(config)# router msdp vrf blue
device(config-msdp-router-vrf blue)# originator-id loopback 2
device(config-msdp-router-vrf blue)# exit

The originator-id command instructs MSDP to use the specified interface IP address as the IP address of the RP in an SA message. This address must be the address of the interface used to connect the RP to the source. The default address used is the RP IP address.

Parent topic: Configuring Multicast Source Discovery Protocol