Nortel BayStack 450-24T Using Manual page 102

Using the BayStack 450 10/100/1000 Series Switch
As shown in Figure 1-40, a non-IP multicast filtering switch causes IP multicast
traffic to be sent to all segments on the local subnet.
membership
IGMP
Host
Host
membership
report
Figure 1-40. IP Multicast Propagation With IGMP Routing
The BayStack 450 switch can automatically set up IP multicast filters so the IP
multicast traffic is directed only to the participating end nodes (see Figure 1-41).
In Figure 1-41, 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.
1-70
Host
query
Designated
router #1
Multicast stream
Non-IP Multicast
filtering switch
Internet
membership
Designated
router #2
Non-IP Multicast
filtering switch
Host
membership
report
Host
query
BS45021B
309978-D Rev 01