Operation Manual – MulticastH3C S7500 Series Ethernet Switches Chapter 6 IGMP Configuration6-5z On VLAN interface 2, configure VLAN interface 1 as the outbound IGMP Proxyinterface to external networks. You must enable the IGMP protocol on the interfacefirst, and then configure the igmp proxy command.Configure Switch A as follows:z Enable multicast routing and configure the IGMP protocol on VLAN interface 1.z Configure the pim neighbor-policy command to filter PIM neighbors in thenetwork segment 33.33.33.0/24. That is, Switch A does not consider Switch B asits PIM neighbor.In this case, when VLAN interface 2 of Switch B of the leaf network receives an IGMPjoin or IGMP leave message sent by the host, it will change the source address of theIGMP message into the address of VLAN interface 1 (33.33.33.2) and send theinformation to VLAN interface 1 of Switch A. For Switch A, this works as if there is ahost directly connected to VLAN interface 1.Similarly, when Switch B receives an IGMP general group or group-specific querymessage from the Layer 3 Switch A, it will also change the source address of the querymessage into the IP address of VLAN interface 2 (22.22.22.1) and send the messagefrom VLAN interface 2.In Figure 6-2, VLAN interface 2 of Switch B is called the client interface and VLANinterface 1 of Switch B is called the proxy interface.6.2 IGMP ConfigurationComplete the following tasks to configure IGMP:Task RemarksConfiguring IGMP Version OptionalConfiguring IGMP Query Messages OptionalConfiguring IGMP Multicast Groups on the Interface OptionalConfiguring Router Ports to Join the Specified Multicast Group OptionalConfiguring IGMP Proxy OptionalConfiguring Suppression on IGMP Report Messages OptionalRemoving the Joined IGMP Groups from the Interface Optional6.2.1 Configuring IGMP VersionFollow these steps to configure IGMP version:
