4 Peer each RP with every other RP using MSDP, specifying the unique Loopback address as the connect-source.CONFIGURATION modeip msdp peer5 Advertise the network of each of the unique Loopback addresses throughout the network.ROUTER OSPF modenetworkReducing Source-Active Message FloodingRPs 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 theRFP 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 aset 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 informationonly to its peers outside of the group.To create a mesh group, use the following command.• Create a mesh group.CONFIGURATION modeip msdp mesh-groupSpecifying the RP Address Used in SA MessagesThe 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 thesame address.To use the (unique) address of another interface as the originator-id, use the following command.• Use the address of another interface as the originator-id instead of the RP address.CONFIGURATION modeip msdp originator-idExamples of R1, R2, and R3 Configuration for MSDP with Anycast RPThe following example shows an R1 configuration for MSDP with Anycast RP.ip multicast-routing!interface TenGigabitEthernet 1/1ip pim sparse-modeip address 10.11.3.1/24no shutdown!interface TenGigabitEthernet 1/2ip address 10.11.2.1/24no shutdown!interface TenGigabitEthernet 1/21ip pim sparse-modeip address 10.11.1.12/24no shutdown!interface Loopback 0ip pim sparse-modeip address 192.168.0.1/32no shutdown!Multicast Source Discovery Protocol (MSDP) 573
