Enable fast (immediate) leave mode to specify if a port receives a leave message from a member of a group. If you enable fast leave mode on a port, it uses the global fast leave mode configuration.
enable
configure terminal
interface GigabitEthernet {slot/port[/sub-port][-slot/port[/sub-port]][,...][slot/all][all]}
Note
If the platform supports channelization and the port is channelized, you must also specify the sub-port in the format slot/port/sub-port.