With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cpimExtMRouteTable
cpim Ext M Route Table
1.3.6.1.4.1.9.10.120.1.1.4
The (conceptual) table listing PIM-specific information on a subset of the rows of the cIpMRouteTable defined in the IP Multicast MIB. This table is augmented to cPimInetMRouteTable
Back to CISCO-IETF-PIM-EXT-MIB MIB page.
IPHost Network monitor allows you to monitor cpimExtMRouteTable on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.