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Let’s say, for instance, we would like to modify this
behavior so that the multicast packet is only forwarded to those
neighbors that want to receive it. Assume the routers in the network
are all running PIM Sparse-Mode and the Hub router is the RP. When
router A sends a Join for a multicast group to the hub, the hub
router sets up a multipoint VC for the group. If another spoke
router joins the same group, the hub router just adds the spoke
router to the multipoint VC. When traffic for the group is received
by the hub, the router only needs to send one copy on the multipoint
VC that was established for the group. Then the ATM switches between
the hub and spoke routers are responsible for replicating and
delivering the packets. This feature is configured using the
interface command: |
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