Chapter 32 Configuring Msdp; Understanding Msdp - Cisco Catalyst 3750 Software Configuration Manual

Metro switch

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Table of Contents

Configuring MSDP

This chapter describes how to configure the Multicast Source Discovery Protocol (MSDP) on the

Catalyst 3750 Metro switch. The MSDP connects multiple Protocol-Independent Multicast sparse-mode

(PIM-SM) domains.

MSDP is not fully supported in this software release because of a lack of support for Multicast Border

Gateway Protocol (MBGP), which works closely with MSDP. However, it is possible to create default

peers that MSDP can operate with if MBGP is not running.

For complete syntax and usage information for the commands used in this chapter, refer to the Cisco IOS

IP and IP Routing Command Reference for Release 12.1.

This chapter consists of these sections:

MSDP allows multicast sources for a group to be known to all rendezvous points (RPs) in different

domains. Each PIM-SM domain uses its own RPs and does not depend on RPs in other domains. An RP

runs MSDP over the TCP to discover multicast sources in other domains.

An RP in a PIM-SM domain has an MSDP peering relationship with MSDP-enabled devices in another

domain. The peering relationship occurs over a TCP connection, primarily exchanging a list of sources

sending to multicast groups. The TCP connections between RPs are achieved by the underlying routing

system. The receiving RP uses the source lists to establish a source path.

The purpose of this topology is to have domains discover multicast sources in other domains. If the

multicast sources are of interest to a domain that has receivers, multicast data is delivered over the

normal, source-tree building mechanism in PIM-SM. MSDP is also used to announce sources sending

to a group. These announcements must originate at the domain's RP.

MSDP depends heavily on the Border Gateway Protocol (BGP) or MBGP for interdomain operation. We

recommend that you run MSDP in RPs in your domain that are RPs for sources sending to global groups

to be announced to the Internet.

Understanding MSDP, page 32-1

Configuring MSDP, page 32-4

Monitoring and Maintaining MSDP, page 32-19

C H A P T E R

Catalyst 3750 Metro Switch Software Configuration Guide

Troubleshooting