3. Troubleshooting Functional Failures in Operation67Table 3-27: Check Items When Double-relay Continues3.8.3 Communication on IPv4 PIM-SSM Network Is DisabledIf multicast relay on the IPv4 PIN-SSM network configuration is disabled, isolate the cause according to the failureanalysis method below.The figure below illustrates a network example of IPv4 PIM-SSM.Figure 3-12: Example of IPv4 PIM-SSM NetworkNote• first-hop-router: This router is directly connected to the multicast sender.• last-hop-router: This router is directly connected to the multicast receiver.(1) Common check itemsThe table below shows the common check items for all system in the IPv4 PIM-SSM network configuration.Table 3-28: Common Check ItemsNo. Troubleshooting Steps and Command Action1 Check the PIM neighboring information on the interface of thenetwork having multiple routers.show ip pim neighborIf the neighboring router is not displayed, check thefollowing:• Confirm that PIM is running on the interface connected tothe neighboring router using the show ip piminterface command.• Confirm in the configuration that suppression of protocolpacket relay by filtering, etc. is not provided.• Verify the settings of the neighboring router.No. Troubleshooting Steps and Command Action1 Confirm that the use of multicast function is specified (ipmulticast routing) in the configuration.show running-configIf the use of multicast function is not designated, correct theconfiguration.2 Confirm that PIM is running on one or more interfaces.show ip pim interfaceIf PIM is not running, check the configuration. Set PIM to runon one or more interfaces. If the interface set in theconfiguration to run PIM is not displayed by the show ippim command with "interface" parameter specified, confirmthat multi-homing is not set on the interface.MulticastMulticastMulticastMulticastsenderreceiverreceiverdataParticipation inthe IGMP groupfirst-hop-router last-hop-routerParticipation inthe IGMP group
