Avaya Configuring IP Multicasting and Multimedia Services User Manual download pdf (Page 60)

Configuring IP Multicasting and Multimedia Services

4-2

117355-C Rev 00

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

Tree Pruning 4-7

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Avaya Configuring IP Multicasting and Multimedia Services User Manual Page 60