wat-edge-1#sho ip igmp groups fa7/37
IGMP Connected Group Membership
Group Address    Interface                Uptime    Expires   Last Reporter
wat-edge-1#
wat-edge-1#
wat-edge-1#sho ip igmp groups fa7/37
IGMP Connected Group Membership
Group Address    Interface                Uptime    Expires   Last Reporter
224.5.6.7        FastEthernet7/37         00:00:02  00:02:57  128.59.7.10
wat-edge-1#sho ip igmp groups fa7/37
IGMP Connected Group Membership
Group Address    Interface                Uptime    Expires   Last Reporter
224.5.6.7        FastEthernet7/37         00:01:31  00:02:13  128.59.7.10
wat-edge-1#sho ip igmp groups fa7/37
IGMP Connected Group Membership
Group Address    Interface                Uptime    Expires   Last Reporter
224.5.6.7        FastEthernet7/37         00:01:37  00:00:00  128.59.7.10
wat-edge-1#sho ip igmp groups fa7/37
IGMP Connected Group Membership
Group Address    Interface                Uptime    Expires   Last Reporter
wat-edge-1## fast leave just works!