Cisco Cisco IOS Software Release 12.0(12)S

This feature module describes the Multicast Source Discovery Protocol (MSDP) Management 
Information Base (MIB) support added for SNMP network monitoring in Cisco IOS Release 12.0(12)S. 
It includes information on the benefits of the new feature, supported platforms, supported standards, 
and the commands necessary to configure the MSDP MIB feature

This document includes the following sections:

Multicast Source Discovery Protocol (MSDP) is a mechanism to connect multiple PIM sparse-mode 
(SM) domains. 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 need not depend on RPs in other 
domains. An RP runs MSDP over TCP to discover multicast sources in other domains. MSDP support 
was implemented in Cisco IOS releases 12.0(5)S and 12.0(7)T.

The MSDP MIB describes managed objects that can be used to remotely monitor MSDP speakers using 
SNMP.

The MSDP MIB module contains four scalar objects and three tables. The tables are the Requests table, 
the Peer Table, and the Source-Active (SA) Cache Table. The Cisco implementation supports the Peer 
Table and SA Cache Table only. The Requests table contains information used to determine which peer 
to send SA requests to. However, the MSDP implementation used in Cisco IOS software does not 
associate sending SA requests to peers with group addresses (or group address masks).