3. Troubleshooting Functional Failures in Operation813.11 IPv6 Multicast Routing Communication FailureActions to be taken if IPv6 multicast communication failures occur on this system are described below.3.11.1 Communication on IPv6 PIM-SM Network Is DisabledIf multicast relay on the IPv6 PIN-SM network configuration is disabled, isolate the cause according to the failureanalysis method below.The figure below illustrates a network example of IPv6 PIM-SM.Figure 3-16: Example of IPv6 PIM-SM NetworkNote• BSR: This router delivers rendezvous point information (for details, see the manual "Configuration Settings").• Rendezvous point router: This router relays the packets, for which the relay destination is not determined, towardthe multicast receiver (for details, see the manual "Configuration Settings").• 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-SM network configuration.Table 3-38: 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 port to which neighboring router connects.• See "3.5.5 Multicast Relay by MLD snooping Is Disabled."MulticastMulticastMulticastMulticastSenderReceiverReceiverdataParticipation inthe MLD groupBSR andrendezvous point routerfirst-hop-routerlast-hop-routerParticipation inthe MLD group
