Users Guide

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 sent to 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 the active 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 more than one area. New sources register with the backup RP. Receivers join toward the new RP
and connectivity is maintained.
Implementation Information
The 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 Protocol
Configuring 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
Shortest Path 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 Tasks
The 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
Multicast Source Discovery Protocol (MSDP) 569