
Configuring IGMP Relay
117355-C Rev 00
9-3
IGMP Relay concepts, terminology, functions, and components are discussed
under the following topics:
IGMP Relay Topology
An IGMP Relay device is located physically between the IGMP hosts and the IP
multicast router it supports. The hosts are considered to lie downstream of the
IGMP Relay device; the multicast router is upstream. The upstream link to the IP
multicast router can be a frame relay link or a dial connection. For redundancy, an
IGMP Relay device can be connected on upstream links to two IP multicast
routers, a primary router and a backup router.
For example, Figure 9-2
shows an IGMP Relay device with downstream
interfaces to three networks containing IGMP hosts. The IGMP Relay device also
has an upstream interface to a primary IP multicast router and a second upstream
interface to a backup IP multicast router on a dial-up line.
Topic Page
IGMP Relay Topology
9-3
How IGMP Relay Works 9-4
Unicast Routing Protocols on the IGMP Relay Device 9-8
Routing Protocols on the Multicast Router 9-8
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