Local Join Callbacks
After the multicast group manager is notified by IGMP that new receivers are present for a group on an interface, the multicast group manager invokes the PMGM_LOCAL_JOIN_CALLBACK callback to the routing protocol that owns the interface if one exists. This callback notifies the routing protocol of the change.
This callback and the PMGM_LOCAL_LEAVE_CALLBACK callback are used to synchronize forwarding between IGMP and routing protocols.
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