Avaya Configuring IP Multicasting Services Manual de usuario Pagina 46

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Configuring IP Multicasting Services
4-8 114064 Rev. A
Configuring Tree Pruning
If a host drops out of a multicast group, multicast routers may continue to forward
group messages to that host. DVMRP routers use a technique called pruning to
avoid the waste of network resources caused by the transmission of group
messages to hosts that are no longer members of the group.
The following conditions cause DVMRP to prune the shortest-path tree for a
given group:
The router determines that the attached network on which the host is located
(or any other locally attached network) has no active member of the group.
The router determines that all neighbors on all attached networks other than
the next-hop network to the source have pruned off the source and group.
The router determines that it is not located on the shortest network path to any
remote network that includes a member of the group.
The router sends a DVMRP PRUNE message to its DVMRP neighbor. The
neighbor removes the router from its forwarding table.
If the host later rejoins the group, the router sends the neighbor a DVMRP
GRAFT message. The router restores the router to its forwarding table.
Tree pruning is enabled on the router by default. You can use Site Manager to
disable and re-enable tree pruning on the router.
Site Manager: Pruning Enable parameter: page A-5
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