Multicast Packet Forwarding Mechanism 551
■ 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.
■ 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.
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For details about the RPF mechanism, refer to “RPF Mechanism” on page 701.
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