Configuring MSDP Information About Configuring MSDP, on page 1 How to Configure MSDP, on page 4 Monitoring and Maintaining MSDP, on page 24 Configuration Examples for Configuring MSDP, on page 24 Feature History for Multicast Source Discovery Protocol, on page 26 Information About Configuring MSDP This section describes how to configure the Multicast Source Discovery Protocol (MSDP on the 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. To use this feature, the active switch must be running the Network Advantage feature set. Note MSDP Overview 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. Configuring MSDP 1