Operation Manual – Multicast ProtocolH3C S3610&S5510 Series Ethernet Switches Chapter 5 IGMP Configuration5-15II. Network diagramEthernet EthernetFigure 5-3 Network diagram for IGMP configurationIII. Configuration procedure1) Configure the IP addresses of the switch interfaces and configure a unicast routingprotocolConfigure the IP address and subnet mask of each interface as per Figure 5-3. Thedetailed configuration steps are omitted here.Configure the OSPF protocol for interoperation among the switches. Ensure thenetwork-layer interoperation among Switch A, Switch B and Switch C on the PIMnetwork and dynamic update of routing information among the switches through aunicast routing protocol. The detailed configuration steps are omitted here.2) Enable IP multicast routing, and enable IGMP on the host-side interfaces# Enable IP multicast routing on Switch A, and enable IGMP (version 3) onVLAN-interface 100. system-view[SwitchA] multicast routing-enable[SwitchA] interface vlan-interface 100[SwitchA-Vlan-interface100] igmp enable[SwitchA-Vlan-interface100] igmp version 3[SwitchA-Vlan-interface100] quit# Enable IP multicast routing on Switch B, and enable IGMP (version 2) onVLAN-interface 200.