With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cisV3Blocks
Cisco IGMP Snooping V3 Blocks
1.3.6.1.4.1.9.9.263.1.2.1.1.15
Number of Source-List-Change records with the record type BLOCK_OLD_SOURCE that have been sent from hosts connected to an interface. This record type indicates that the Source Address fields in this Group Record contain a list of the sources that the system no longer wishes to hear from, for packets sent to the specified multicast address.
Back to CISCO-IGMP-SNOOPING-MIB MIB page.
IPHost Network monitor allows you to monitor cisV3Blocks 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.
