Troubleshooting IGMP 1129# Enable IP multicast routing on Router B, and enable IGMP (version 2) andPIM-DM on Ethernet 1/0. system-view[RouterB] multicast routing-enable[RouterB] interface ethernet 1/0[RouterB-Ethernet1/0] igmp enable[RouterB-Ethernet1/0] igmp version 2[RouterB-Ethernet1/0] pim dm[RouterB-Ethernet1/0] quit# Enable IP multicast routing on Router C, and enable IGMP (version 2) andPIM-DM on Ethernet 1/0. system-view[RouterC] multicast routing-enable[RouterC] interface ethernet 1/0[RouterC-Ethernet1/0] igmp enable[RouterC-Ethernet1/0] igmp version 2[RouterC-Ethernet1/0] pim dm[RouterC-Ethernet1/0] quit3 Verify the configurationUse the display igmp interface command to view the IGMP configuration andoperation status on each router interface. For example:# View IGMP information on Ethernet 1/0 of Router B.[RouterB] display igmp interface ethernet 1/0Ethernet1/0(10.110.2.1):IGMP is enabledCurrent IGMP version is 2Value of query interval for IGMP(in seconds): 60Value of other querier present interval 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 MembershipInformation on theReceiver-Side RouterSymptomWhen a host sends a report for joining multicast group G, there is no membershipinformation 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 membership 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.
