With Anycast RP, all the RPs are configured to be MSDP peers of each other. When a source registers with one RP, an SA message is sentto the other RPs informing them that there is an active source for a particular multicast group. The result is that each RP is aware of theactive sources in the area of the other RPs. If any of the RPs fail, IP routing converges and one of the RPs becomes the active RP in morethan one area. New sources register with the backup RP. Receivers join toward the new RP and connectivity is maintained.Implementation InformationThe Dell Networking OS implementation of MSDP is in accordance with RFC 3618 and Anycast RP is in accordance with RFC 3446.Configure Multicast Source Discovery ProtocolConfiguring MSDP is a four-step process.1 Enable an exterior gateway protocol (EGP) with at least two routing domains.Refer to the following figures.The MSDP Sample Configurations show the OSPF-BGP configuration used in this chapter for MSDP. Also, refer to Open ShortestPath First (OSPFv2) and Border Gateway Protocol IPv4 (BGPv4).2 Configure PIM-SM within each EGP routing domain.Refer to the following figures.The MSDP Sample Configurations show the PIM-SM configuration in this chapter for MSDP. Also, refer to PIM Sparse-Mode (PIM-SM).3 Enable MSDP.4 Peer the RPs in each routing domain with each other. Refer to Enable MSDP.Related Configuration TasksThe following lists related MSDP configuration tasks.• Enable MSDP• Manage the Source-Active Cache• Accept Source-Active Messages that Fail the RFP Check• Specifying Source-Active Messages• Limiting the Source-Active Cache• Preventing MSDP from Caching a Local Source• Preventing MSDP from Caching a Remote Source• Preventing MSDP from Advertising a Local Source• Terminating a Peership• Clearing Peer Statistics• Debugging MSDP• MSDP with Anycast RP• MSDP Sample ConfigurationsMulticast Source Discovery Protocol (MSDP) 557
