With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
ciscoIpMRouteDifferentInIfPkts
cisco Ip M Route Different In If Packets
1.3.6.1.4.1.9.10.2.1.1.2.1.29
The number of packets which this router has received from these sources and addressed to this multicast group address, which were not received from the interface indicated by ipMRouteInIfIndex. This object is a 64-bit version of ipMRouteDifferentInIfPackets.
Back to CISCO-IPMROUTE-MIB MIB page.
IPHost Network monitor allows you to monitor ciscoIpMRouteDifferentInIfPkts on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.