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One very important characteristic of dense mode protocols is
the prune/broadcast cycle. In Figure 6-19, if router B never had any
attached receivers or downstream PIM-DM neighbors, then multicast
traffic would never need to be forwarded to router B. Initially,
router B will prune itself from any source-based delivery trees.
Since prunes have a limited lifetime, router B would again be sent
multicast traffic from router A. Router B would again send a prune
to A, which would timeout, and cause A to forward to B. This
triggers a prune, and so it goes. If you are certain that multicast
traffic does not need to go to a particular router, then don’t
enable PIM-DM on the interfaces. |
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