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To ensure multicast packet transmission in the network, unicast routing tables or multicast routing
tables specially provided for multicast must be used as guidance for multicast forwarding.
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To process the same multicast information from different peers received on different interfaces of
the same device, every multicast packet is subject to a reverse path forwarding (RPF) check on the
incoming interface. The result of the RPF check determines whether the packet will be forwarded
or discarded. The RPF check mechanism is the basis for most multicast routing protocols to
implement multicast forwarding.
