Reference Guide

Multicast Source Discovery Protocol (MSDP) | 579

Multicast Source Discovery Protocol (MSDP)

Multicast Source Discovery Protocol (MSDP) is supported on the S5000 switch.

This chapter contains the following sections:

• Protocol Overview

• Implementation Information

• Configuring Multicast Source Discovery Protocol

• Enabling MSDP

• Managing the Source-active Cache

• Accepting Source-active Messages that fail the RFP Check

• Limiting the Source-active Messages from a Peer

• Preventing MSDP from Caching a Local Source

• Preventing MSDP from Caching a Remote Source

• Preventing MSDP from Advertising a Local Source

• Logging Changes in Peership States

• Terminating a Peership

• Clearing Peer Statistics

• Debugging MSDP

• MSDP with Anycast RP

• MSDP Sample Configurations

Protocol Overview

Multicast Source Discovery Protocol (MSDP) is a Layer 3 protocol that connects IPv4 PIM-SM domains.

A domain in the context of MSDP is contiguous set of routers operating PIM within a common boundary

defined by an exterior gateway protocol, such as BGP.

Each rendezvous point (RP) peers with every other RP via TCP. Through this connection, peers advertise

the sources in their domain.

1. When an RP in a PIM-SM domain receives a PIM register message from a source it sends a

Source-Active (SA) message (Figure 31-1) to MSDP peers.

2. Each MSDP peer receives and forwards the message to its peers away from the originating RP.