Review the statistics.
SEFOS# show ip igmp snooping statistics
Snooping Statistics for VLAN 1
General queries received: 0
Group specific queries received: 0
Group and source specific queries received: 0
ASM reports received: 0
SSM reports received: 0
IS_INCLUDE messages received: 0
IS_EXCLUDE messages received: 0
TO_INCLUDE messages received: 0
TO_EXCLUDE messages received: 0
ALLOW messages received: 0
Block messages received: 0
Leave messages received: 0
General queries transmitted: 0
Group specific queries transmitted: 0
Group and source specific queries transmitted : 0
ASM reports transmitted: 0
SSM reports transmitted: 0
Leaves transmitted: 0
Unsuccessful joins recieved count Per Vlan : 0
Active/Successful joins recieved count Per Vlan: 0
Active Groups count: 0
Packets dropped: 0