3Com 4210G Series Configuration Manual page 384

Configure the sub-VLAN-based multicast VLAN feature so that Router A just sends multicast data
to Switch A through the multicast VLAN and Switch A forwards the traffic to the receivers that
belong to different user VLANs.
Network diagram
Figure 3-4 Network diagram for sub-VLAN-based multicast VLAN configuration
Source
GE1/0/1
1.1.1.2/24
1.1.1.1/24
Switch A
GE1/0/2
Receiver
Host A
VLAN 2
Configuration procedure
1) Configure IP addresses
Configure an IP address and subnet mask for each interface as per
configuration steps are omitted here.
2) Configure Router A
# Enable IP multicast routing, enable PIM-DM on each interface and enable IGMP on the host-side
interface GigabitEthernet 1/0/2.
<RouterA> system-view
[RouterA] multicast routing-enable
[RouterA] interface gigabitethernet 1/0/1
[RouterA-GigabitEthernet1/0/1] pim dm
[RouterA-GigabitEthernet1/0/1] quit
[RouterA] interface gigabitethernet 1/0/2
[RouterA-GigabitEthernet1/0/2] pim dm
[RouterA-GigabitEthernet1/0/2] igmp enable
3) Configure Switch A
# Enable IGMP Snooping globally.
<SwitchA> system-view
[SwitchA] igmp-snooping
[SwitchA-igmp-snooping] quit
# Create VLAN 2 and assign GigabitEthernet 1/0/2 to this VLAN.
[SwitchA] vlan 2
IGMP querier
Router A
GE1/0/2
10.110.1.1/24
GE1/0/1
GE1/0/4
GE1/0/3
Receiver
Host B
VLAN 3 VLAN 4
3-7
Receiver
Host C
Figure 3-4. The detailed