With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cIpMRouteNextHopSource
Cisco Ip Multicast Route Next Hop Source
1.3.6.1.4.1.9.10.117.1.1.3.1.3
The network address which when combined with the corresponding value of cIpMRouteNextHopSourceMask identifies the sources for which this entry specifies a next-hop on an outgoing interface.
Back to CISCO-IETF-IPMROUTE-MIB MIB page.
IPHost Network monitor allows you to monitor cIpMRouteNextHopSource on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.