SMC Networks SMC6724L3 Instrukcja Użytkownika Pobierz pdf (Strona 271)

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101

ULTICAST

OUTING

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to build up a source-rooted multicast delivery tree that allows it to prevent

looping and determine the shortest path to the source of this multicast

traffic.

When this router receives the multicast message, it checks its unicast

routing table to locate the port that provides the shortest path back to the

source. If that path passes through the same port on which the multicast

message was received, then this router records path information for the

concerned multicast group in its routing table and forwards the multicast

message on to adjacent routers, except for the port through which the

message arrived. This process eliminates potential loops from the tree and

ensures that the shortest path (in terms of hop count) is always used.

Configuring Global DVMRP Settings

DVMRP is used to route multicast traffic to nodes which have requested a

specific multicast service via IGMP. This router uses Reverse Path

Forwarding (RPF) to build a shortest-path delivery tree that begins at the

source and spreads out to reach group members through the network.

RPF uses three different techniques to dynamically reconfigure the

multicast spanning tree: broadcasting, pruning, and grafting.

source

branch

leaf

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