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• last-hop-router: This router is directly connected to the multicast receiver. (1) Common check items The table below shows the common check items for all system in the IPv6 PIM-SSM network configuration. Table 3-44: Common Check Items No. Troubleshooting Steps and Command Action 1 Confirm that the use of multicast function is designated (ipv6 multicast routing) in the configuration. show running-config If the use of multicast function is not designated, correct the configuration. 2 Confirm that the address of the loopback interface is set in the configuration. show running-config If the address of the loopback interface is not set, correct the configuration. 3 Confirm that PIM is running on one or more interfaces. show ipv6 pim interface If PIM is not running, check the configuration. Set PIM to run on one or more interfaces. 4 Confirm that MLD snooping is set to the interface with PIM enabled. show mld-snooping When MLD snooping is set, confirm the following: • Confirm that multicast router port for MLD snooping is set to 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 protocol packet and multicast packet relay through filtering, etc. is not provided on the interface that allows PIM and MLD to run. show running-config If suppression of protocol packet and multicast packet relay is provided, correct the configuration. 6 Check the PIM neighboring information. show ipv6 pim neighbor If the neighboring router is not displayed, check the following: • Confirm that PIM is running on the interface connected to the neighboring router using the show ipv6 pimcommand with "interface" parameter specified. • Verify the settings of the neighboring router. 3. Troubleshooting Functional Failures in Operation No. Troubleshooting Steps and Command Action 7 Check to see if the unicast route to the multicast data sender exists. show ipv6 route If the unicast route does not exist, see "3.10 IPv6 Unicast Routing Communication Failure." 8 Confirm that PIM is running on the sending interface for the unicast route to the multicast data sender. show ipv6 pim interface If IGMP is not running, check the configuration and set the configuration to run PIM on the sending interface for the unicast route. 9 Confirm that the PIM-SSM group addresses contain the relay target group address, referring to the configuration. show running-config If the PIM-SSM group addresses do not contain the relay target group address, correct the configuration. 10 Confirm that the multicast relay routing information exists. show ipv6 mroute If the multicast routing information does not exist, check the setting of the downstream router. 11 Confirm that multicast routing information or multicast forwarding entry does not exceed the upper limit. Multicast routing information: show ipv6 mrouteMulticast forwarding entry: show ipv6 mcache netstat multicast When warning is output, confirm that unexpected multicast routing information or unexpected multicast forwarding entry has not been created. If much of the negative cache exists in multicast forwarding entry, check to see if no terminal transmitting unnecessary packets exist. (2) last-hop-router check items The table below shows the items to be checked when this system is the last-hop-router in the IPv6 PIM-SSM network configuration. Table 3-45: last-hop-router Check Items No. Troubleshooting Steps and Command Action 1 If the mode of multicast receiver is MLDv1/MLDv2 (EXCLUDE mode), confirm in the configuration that the use of PIM-SSM in MLDv1/MLDv2 (EXCLUDE mode) is designated (ipv6 mld ssm-map enable). show running-config If the use of PIM-SSM in MLDv1/MLDv2 (EXCLUDE mode) is not designated, correct the configuration. 2 If the mode of multicast receiver is MLDv1/MLDv2 (EXCLUDE mode), confirm in the configuration that cooperation with PIM-SSM in MLDv1/MLDv2 (EXCLUDE mode) is set for the group address and source address to be relayed by PIM-SSM (ipv6 mld ssm-map static). show running-config If cooperation with PIM-SSM in MLDv1/MLDv2 (EXCLUDE mode) is not designated, correct the configuration. 3 Confirm that MLD is running on the interface connected to the multicast receiver. show ipv6 mld interface If MLD is not running, check the configuration and set the configuration to run MLD. 4 Confirm that MLD warning information is not displayed on the interface connected to the multicast receiver. show ipv6 mld interface If displayed, take the action against the warning. For details on the warning, see "Operation Commands." 5 Confirm that the multicast receiver participates in the relay target group via MLD. show ipv6 mld group If the group does not participate in the relay target group, check the setting of the multicast receiver. 6 Confirm that the source address is registered in the MLD group information. show ipv6 mld group If the mode of multicast receiver is MLDv2 (INCLUDE mode) and the source address is n...

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