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If the hub router needs to send a broadcast to every spoke
router, then the broadcast packet needs to be replicated and sent
four times, once to each spoke router. This is not a problem with an
occasional broadcast packet, yet with multicast traffic this method
of operation can dramatically affect the bandwidth utilization on
the frame relay network. For example, assume the hub router receives
multicast traffic for groups that only router B and C have joined.
The multicast traffic would be replicated and sent to routers A, B,
C, and D, even though A and D do not have receivers. We also assume
here that all four spoke routers are running PIM. To override this
behavior, configure the interface in NBMA mode. |
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