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After the multicast group manager is notified by IGMP that there are no more receivers present for a group on an interface, the multicast group manager invokes the PMGM_LOCAL_LEAVE_CALLBACK callback to the routing protocol on that interface if one exists. This callback notifies the routing protocol of the change.
This callback and the PMGM_LOCAL_JOIN_CALLBACK callback are used to synchronize forwarding between IGMP and routing protocols.