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Overriding Prunes

If a host on a previously pruned branch requests to join a multicast group, it sends an IGMP message to its first-hop router. The first-hop router then sends a graft message upstream.

PIM routers send join messages on multiaccess interfaces to override prune messages. For example, if a PIM router sent a prune message to indicate that it had no hosts for a multicast group, and one of its hosts subsequently requests to send a packet to that group, the router sends a join message to the first-hop router.

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