Dell PowerConnect 8024 User Configuration Manual page 737

• Router-attached ports: D3 – 1/0/20, D2 – PortChannel1, D1 – 1/0/15
Snooping Within a Subnet
In the example network topology, the multicast source and listeners are in the
same subnet VLAN 20 – 192.168.20.70/24. D1 and D3 are configured to drop
unregistered multicast traffic. D4 sends periodic queries on VLAN 10, and
these queries are forwarded to D1, D2, and D3 via trunk links. Snooping
switches D1, D2, and D3 forward these queries to clients G, F, and D,
respectively.
Multicast Source and Listener directly connected to a snooping switch:
Server B Client G

1 Client G sends a report for 239.20.30.42.
2 The report is forwarded to multicast router D4 via D1 – 1/0/15 and D3 –
1/0/20.
3 A forwarding entry is created by D1 for VLAN 20, 239.20.30.42 – 1/0/8,
1/0/15.
4 Client G receives the multicast stream from Server B.
5 D3 receives the multicast stream but is dropped because 239.20.30.42 is
not registered on D3.
6 Client D sends a report for 239.20.30.42.
7 The report is forwarded to multicast router D4 via D3 – 1/0/20.
8 A forwarding entry is created by D3 for VLAN 20, 239.20.30.42 – 1/0/6,
1/0/20.
9 Client D receives the multicast stream from Server B.
10 Client F does not receive the multicast stream because it did not respond
to queries from D4.
Multicast Source and Listener connected by intermediate snooping switches:
Server B Client D

1 Client D sends a report for 239.20.30.42.
2 The report is forwarded to multicast router D4 via D3 – 1/0/20.
3 A forwarding entry is created by D3 for VLAN20, 239.20.30.42 – 1/0/6,
1/0/20.
Configuring L2 Multicast Features
737