731
Cisco Systems, Inc. www.cisco.com
Configuring MSDP
This chapter describes how to configure Multicast Source Discovery Protocol (MSDP) on the Cisco Industrial Ethernet
Switches, hereafter referred to as switch. 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.
To use this feature, the switch must be running the IP services image.
Note: For complete syntax and usage information for the commands used in this chapter, see the documents listed in
the Related Documents, page 752.
This chapter includes the following sections:
Information About MSDP, page 731
Prerequisites, page 733
Guidelines and Limitations, page 733
Default Settings, page 733
Configuring MSDP, page 733
Verifying Configuration, page 751
Configuration Example, page 751
Related Documents, page 752
Information About MSDP
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 Transmission Control
Protocol (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.
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