Avaya Configuring IP Multicasting Services Bedienungsanleitung Seite 54

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Configuring IP Multicasting and Multimedia Services
4-2 117355-A Rev. A
DVMRP Concepts and Terminology
DVMRP is a multicasting protocol that provides a mechanism for routers to
propagate multicast datagrams in a manner that minimizes the number of excess
copies sent to any particular network.
This section covers the following topics:
Neighbor Connections
In a DVMRP environment, neighbors are multicasting routers that are connected
directly or through a tunnel.
Directly connected neighbors are routers that have an interface to the same
network.
Tunnel-connected neighbors are multicast routers that communicate through a
unicast network, exchanging DVRMP messages that are encapsulated in IP
datagrams.
In Figure 4-
1, for example, multicasting Router A has two neighbors, Router B
and Router C. Router A and Router B are connected directly -- they both have
interfaces to Net 6. Router A and Router C communicate through a tunnel that
includes a unicast router.
Topic Page
Neighbor Connections 4-2
Source Route Advertisements 4-4
How DVMRP Chooses a Route 4-5
Routing Table 4-6
Shortest-Path Trees 4-7
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