With Anycast RP, all the RPs are congured 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.
Congure Multicast Source Discovery Protocol
Conguring MSDP is a four-step process.
1 Enable an exterior gateway protocol (EGP) with at least two routing domains.
Refer to the following gures.
The MSDP Sample Congurations show the OSPF-BGP conguration used in this chapter for MSDP. Also, refer to Open Shortest
Path First (OSPFv2) and Border Gateway Protocol IPv4 (BGPv4).
2 Congure PIM-SM within each EGP routing domain.
Refer to the following gures.
The MSDP Sample Congurations show the PIM-SM conguration 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 Conguration Tasks
The following lists related MSDP conguration 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 Congurations
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Multicast Source Discovery Protocol (MSDP)
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