Avaya Configuring IP Multicasting Services Manual do Utilizador Página 57

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Customizing DVMRP
117355-A Rev. A 4-5
How DVMRP Chooses a Route
Each DVMRP interface is configured with a metric that indicates the cost of the
hop. A router that receives multiple route reports for the same multicasting source
network
Compares the cost specified in each (based on the metric field)
Stores information from the report with the lowest cost in its routing table
A route metric is the sum of all the interface (hop) metrics from a given route
source to a given router.
In F
igure 4-1 on page 4-3, for example, Router D receives two reports for the
network connected to multicasting Router A, one from Router B and one from
Router C. Using the metrics contained in the route reports, Router D determines
that the cost of the tunneled route is greater than the cost of the route that uses
direct physical connections. Router D discards the route received from Router C
and stores the route received from Router B.
Router D then declares Router B to be the next-hop neighbor and Interface d1 to
be the next-hop interface. After a next-hop neighbor has been declared for a route,
the route updates received from that neighbor for that route take precedence until
either the route times out or until another router advertises a better metric for that
route.
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