3. Troubleshooting Functional Failures in Operation853.11.3 Communication on IPv6 PIM-SSM Network Is DisabledIf multicast relay on the IPv6 PIN-SSM network configuration is disabled, isolate the cause according to the failureanalysis method below.The figure below illustrates a network example of IPv6 PIM-SSM.Figure 3-17: Example of IPv6 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 IPv6 PIM-SSM network configuration.Table 3-44: Common Check ItemsNo. Troubleshooting Steps and Command Action1 Confirm that the use of multicast function is designated (ipv6multicast routing) in the configuration.show running-configIf the use of multicast function is not designated, correct theconfiguration.2 Confirm that the address of the loopback interface is set in theconfiguration.show running-configIf the address of the loopback interface is not set, correct theconfiguration.3 Confirm that PIM is running on one or more interfaces.show ipv6 pim interfaceIf PIM is not running, check the configuration. Set PIM to runon one or more interfaces.4 Confirm that MLD snooping is set to the interface with PIMenabled.show mld-snoopingWhen MLD snooping is set, confirm the following:• Confirm that multicast router port for MLD snooping is setto the ports to which neighboring routers connect.• See "3.5.5 Multicast Relay by MLD snooping Is Disabled."5 Confirm in the configuration that suppression of protocolpacket and multicast packet relay through filtering, etc. is notprovided on the interface that allows PIM and MLD to run.show running-configIf suppression of protocol packet and multicast packet relay isprovided, correct the configuration.6 Check the PIM neighboring information.show ipv6 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 ipv6 pimcommand with "interface" parameter specified.• Verify the settings of the neighboring router.MulticastMulticastMulticastMulticastsenderdatareceiverreceiverParticipation inthe MLD grouplast-hop-routerfirst-hop-routerParticipation inthe MLD group
