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Configuring IP Multicasting and Multimedia Services

9-2

303527-A Rev. 00

Concepts and Terminology

A router configured as an IGMP Relay (IGMP-R) device provides the following

services for an MOSPF AS boundary router:

• Solicits multicast group membership information by sending IGMP host

membership queries to hosts on its attached local networks

• Receives host membership reports and unsolicited join messages from hosts

on attached networks and forwards them to the MOSPF boundary router

• Forwards multicast data to group members on locally attached networks

For more information about IGMP, see Chapter 3

An IGMP-R device uses RIP to advertise its local networks. It does not run any

multicast routing protocols (DVMRP or MOSPF).

An IGMP-R device is located physically between the IGMP hosts and the MOSPF

boundary router. The hosts are considered to lie downstream of IGMP-R; the

boundary router is upstream. The upstream link to the MOSPF router can be a

frame relay link or a dial connection.

For redundancy, an IGMP-R device can be connected to two boundary routers, a

primary router and a backup router. For example, Figure 9-1

shows an IGMP-R

device with downstream interfaces to three networks containing IGMP hosts. The

IGMP-R device also has an upstream interface to a primary boundary router and a

second upstream interface to a backup boundary router on a dial-up line.

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Avaya Configuring IP Multicasting and Multimedia Services Bedienungsanleitung Seite 152