626 CHAPTER 46: IGMP CONFIGURATION# Enable IP multicast routing on Switch C, and enable IGMP (version 2) onVLAN-interface 200. system-view[SwitchC] multicast routing-enable[SwitchC] interface vlan-interface 200[SwitchC-Vlan-interface200] igmp enable[SwitchC-Vlan-interface200] igmp version 2[SwitchC-Vlan-interface200] quit3 Verify the configurationCarry out the display igmp interface command to view the IGMP configurationand running status on each switch interface. For example:# View IGMP information on VLAN-interface 200 of Switch B.[SwitchB] display igmp interface vlan-interface 200Vlan-interface200(10.110.2.1):IGMP is enabledCurrent IGMP version is 2Value of query interval for IGMP(in seconds): 60Value of other querier timeout for IGMP(in seconds): 125Value of maximum query response time for IGMP(in seconds): 10Querier for IGMP: 10.110.2.1 (this router)Total 1 IGMP Group reportedTroubleshooting IGMPNo Member Informationon the Receiver-SideRouterSymptomWhen a host sends a report for joining multicast group G, there is no memberinformation of the multicast group G on the router closest to that host.Analysis■ The correctness of networking and interface connections directly affects thegeneration of group member information.■ Multicast routing must be enabled on the router.■ If the igmp group-policy command has been configured on the interface, theinterface cannot receive report messages that fail to pass filtering.Solution1 Check that the networking is correct and interface connections are correct.2 Check that the interfaces and the host are on the same subnet. Use the displaycurrent-configuration interface command to view the IP address of theinterface.3 Check that multicast routing is enabled. Carry out the displaycurrent-configuration command to check whether the multicastrouting-enable command has been executed. If not, carry out the multicastrouting-enable command in system view to enable IP multicast routing. Inaddition, check that IGMP is enabled on the corresponding interfaces.4 Check that the interface is in normal state and the correct IP address has beenconfigured. Carry out the display igmp interface command to view the interfaceinformation. If no interface information is output, this means the interface is
