Nortel Networks 10BASE-T manual IP Multicast Propagation With Igmp Routing

Introduction to the BayStack 410-24T Switch

As shown in Figure 1-32, a non-IP multicast filtering switch causes IP multicast traffic to be sent to all segments on the local subnet.

Host

Membership

IGMP

Host

Query

Designated

router #1

Internet	Host
	Membership
	Query
	Designated
	router #2

Host

Membership

Report

Non-multicast filtering switch

Multicast stream

Non-multicast filtering switch

Host

Membership

Report

BS41026A

Figure 1-32. IP Multicast Propagation With IGMP Routing

The BayStack 410-24T switch can automatically set up IP multicast filters so the IP multicast traffic is directed only to the participating end nodes (see

Figure 1-33).

In Figure 1-33, switches S1 to S4 represent a LAN connected to an IP multicast router. The router periodically sends Host Membership Queries to the LAN and listens for a response from end stations. All of the clients connected to switches S1 to S4 are aware of the queries from the router.

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