Dell PowerConnect 8024 User Configuration Manual page 738

4 Client D will not receive the multicast stream from Server B because it is
dropped at D1, where 239.20.30.42 is not a registered group.
5 The administrator creates a static multicast forwarding entry VLAN 20,
239.20.30.42 – 1/0/15 on D1.
6 Client G will not receive the Server B multicast stream because it did not
request it, and the static multicast forwarding entry does not have
D1 – 1/0/8 as part of the forwarding list.
7 Server B multicast stream reaches D3.
8 Client D receives the multicast stream from Server B.
9 Client F does not receive the multicast stream because it did not respond
to queries from D4.
Snooping on a Multicast Router
In the example network topology, consider Client B and Server A. Both are in
the same subnet VLAN10 – 192.168.10.70/24. Server A is a source for
multicast stream 239.20.30.40. Snooping switches D1, D2, and D3 are
configured to drop unregistered multicast traffic. D4 sends periodic queries
on VLAN 10 and VLAN 20, and these queries reach D1, D2, and D3 via trunk
links, which in turn forward them in VLAN 10 and VLAN 20 to reach their
respective attached clients.
Multicast Source and Listener directly connected to Multicast Router on the
same routing VLAN: Server A
1 Multicast stream 239.20.30.40 is flooded to Client B, and trunk link 1/0/20
on D4 is configured to flood unregistered multicast traffic.
2 Because multicast routing is enabled on D4 VLAN 10, an IP multicast
table entry is created to include D4 – 1/0/15, D4 – 1/0/20 as part of the L2
forwarding list members.
3 Client B sends a report for 239.20.30.40.
4 The IP multicast table entry is modified to include only D4 – 1/0/15 as the
layer 2 forwarding list member.
5 Client B receives multicast data.
6 The multicast stream is not forwarded to D3 on trunk link 1/0/20 because
no other clients requested this data.
738
Configuring L2 Multicast Features
Client B
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