Switch User Manual

48 An Introduction to IP Routing Protocols

The Nortel Ethernet Routing Switch 5500 Series can automatically set up IP

Multicast ﬁlters so the IP Multicast trafﬁc is only directed to the participating

end nodes (see ).

In , "5500 Series switch ﬁltering IP multicast streams (1 of 2)" (page

48)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.

One client, connected to S2, responds with a host membership report.

Switch S2 intercepts the report from that port, and generates a proxy report

to its upstream neighbor, S1. Also, two clients connected to S4 respond

with host membership reports, causing S4 to intercept the reports and to

generate a consolidated proxy report to its upstream neighbor, S1.

5500 Series switch ﬁltering IP multicast streams (1 of 2)

Switch S1 treats the consolidated proxy reports from S2 and S4 as if

they were reports from any client connected to its ports, and generates a

consolidated proxy report to the designated router. In this way, the router

receives a single consolidated report from that entire subnet.

After the switches learn which ports are requesting access to the IP

Multicast stream, all other ports not responding to the queries are blocked

from receiving the IP Multicast ("5500 Series switch ﬁltering IP multicast

streams (2 of 2)" (page 49)).

Nortel Ethernet Routing Switch 5500 Series

Conﬁguration-IP Routing Protocols

NN47200-503 03.01 Standard

5.1 27 August 2007