1-7z Configure the sub-VLAN-based multicast VLAN feature so that Router A just sends multicast datato Switch A through the multicast VLAN and Switch A forwards the traffic to the receivers thatbelong to different user VLANs.Network diagramFigure 1-4 Network diagram for sub-VLAN-based multicast VLAN configurationSourceReceiverHost AVLAN 2GE1/0/2GE1/0/3GE1/0/4Switch AIGMP querierRouter AGE1/0/11.1.1.2/24GE1/0/210.110.1.1/241.1.1.1/24ReceiverHost BVLAN 3ReceiverHost CVLAN 4GE1/0/1Configuration procedure1) Configure IP addressesConfigure an IP address and subnet mask for each interface as per Figure 1-4. The detailedconfiguration steps are omitted here.2) Configure Router A# Enable IP multicast routing, enable PIM-DM on each interface and enable IGMP on the host-sideinterface GigabitEthernet 1/0/2. 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 enable3) Configure Switch A# Enable IGMP Snooping globally. system-view[SwitchA] igmp-snooping[SwitchA-igmp-snooping] quit# Create VLAN 2 and assign GigabitEthernet 1/0/2 to this VLAN.[SwitchA] vlan 2
