With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cisIfLimitTotalLimitMax
Cisco IGMP Snooping If Limit Total Limit Max
1.3.6.1.4.1.9.9.263.1.10.2.1.1
Specifies the maximum total number of IGMP group or channels that allows on all VLANs carried by the interaface when it is in trunk mode.
Back to CISCO-IGMP-SNOOPING-MIB MIB page.
IPHost Network monitor allows you to monitor cisIfLimitTotalLimitMax on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.