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Configuring IP Multicasting and Multimedia Services

4-6

303527-A Rev. 00

Routing Table

Table 4-1 shows the principal items in a routing table entry.

Note that the source subnet and the previous-hop router in the DVMRP routing

table are the opposite of the destination subnet and next-hop router in a RIP

routing table.

Using this information, the router can:

1. Receive a multicast datagram and determine if the datagram has arrived on the

interface that is on the shortest path to the source network.

2. Drop the datagram if it has not arrived on the shortest-path interface.

3. Flood the multicast datagram to all active downstream DVMRP neighbors.

Table 4-1. Parts of a Routing Table Entry

Item Description

Source subnet address and

mask

Address and mask of a subnetwork containing a host

sourcing multicast datagrams

From-gateway Previous-hop router leading back to the source subnet

TTL Number of seconds before this entry is removed from the

routing table

1 2 ... 57 58 59 60 61 62 63 64 65 66 67 ... 233 234

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Avaya Configuring IP Multicasting and Multimedia Services Bedienungsanleitung Seite 62