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Configuring IP Multicasting and Multimedia Services

9-6

303527-A Rev. 00

In Figure 9-4, the following events occur:

1. A host on LAN B sends an unsolicited join message to IGMP-R. IGMP-R

forwards the join message to the MOSPF boundary router.

2. The MOSPF boundary router receives a datagram addressed to the group that

the host has joined.

3. The MOSPF boundary router forwards the datagram downstream to IGMP-R.

4. IGMP-R determines that a member of the group resides on LAN B and

forwards the datagram on the downstream interface to LAN B.

Figure 9-4. IGMP-R and Downstream Multicast Data

IP0074A

IGMP Relay

MOSPF AS

boundary router

LAN A

LAN B

LAN C

Host 1

Group

member

Key

Unsolicited join message

Multicast data

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Avaya Configuring IP Multicasting and Multimedia Services Manuel d'utilisateur Page 156