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Configuring IGMP Relay

303527-A Rev. 00

9-3

Figure 9-1. Multicast Network Topology with an IGMP Relay Device

To an IGMP host on a directly attached network, the IGMP-R device appears to be

a multicast router. The host receives a host membership query from IGMP-R and

responds by sending an IGMP response. A host can also send IGMP-R an

unsolicited join message.

To the MOSPF AS boundary router, the IGMP-R device appears to be a locally

attached host. The MOSPF router (which also runs IGMP) sends IGMP host

queries to the IGMP-R. IGMP-R responds by forwarding -- relaying -- IGMP host

reports and unsolicited join messages from its attached hosts.

Primary MOSPF

AS boundary

router

Backup MOSPF

AS boundary

router

IGMP Relay

Multicast network

IGMP host

Downstream interface

Primary upstream

interface

Network edge

Backup upstream

interface

IP0071A

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Avaya Configuring IP Multicasting and Multimedia Services Manual do Utilizador Página 153