Leave Process

Leave Process
Withdrawal from a group is not initiated by the host, as one would imagine. The router hosts
a timer that is reset every time a response is received from a host on the subnet. The timer runs
for three minutes, which is equivalent to three Membership Query cycles (a cycle lasts 60 seconds).
If the timer expires and no response is received from the hosts on the interface, the router
disables multicast forwarding on that interface. If the router was forwarding for a specific group
and doesn’t get responses for that group but continues to get responses for other groups, it stops
forwarding only for the group that no longer has hosts listening.