3. Troubleshooting Functional Failures in Operation84(5) first-hop-router check itemsThe table below shows the items to be checked when this system is the first-hop-router in the IPv6 PIM-SM networkconfiguration.Table 3-42: first-hop-router Check Items3.11.2 Multicast Data Is Double-relayed on IPv6 PIM-SM NetworkIf multicast data is double-relayed in the IPv6 PIM-SM network configuration, check the settings of each router and setthe configuration to run PIM on the interface for a network having multiple routers.If double-relay still continues, check the following:Table 3-43: Check Items When Double-relay Continues4 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 forwarding port.• See "3.5.5 Multicast Relay by MLD snooping Is Disabled."5 Confirm that no interface in abnormal state is detected.show ipv6 mld interfaceSee notices and confirm that warning information is notoutput. When warning infromation is output, check thefollowing:• L: The number of join request exceeded expectedmaximum number. Check to see the number of connectedusers.• Q: The MLD version of neighboring router is different.Adjust it to the MLD version.• R: A user who transmitted reports unreceivable at thepresent settings exists. Change the MLD version of thissystem or confirm the setting of the participant.• S: Some of the participant information are being discardedbecause the number of source exceeded the upper limitdefined to store source per message in MLDv2. Check thesettings of the participant.No. Troubleshooting Steps and Command Action1 Confirm that this system is directly connected to the multicastsender.If not, check the network configuration.2 Confirm that PIM or MLD is running on the interfaceconnected to the multicast sender.show ipv6 pim interfaceshow ipv6 mld interfaceIf not running, check the configuration and set theconfiguration to run PIM or MLD.3 Confirm that the multicast relay routing information exists.show ipv6 mrouteIf the multicast routing information does not exist, confirmthat multicast data source address is the network address ofthe interface directly connected to the multicast sender.No. Troubleshooting Steps and Command Action1 Check the PIM neighboring information on the interface of thenetwork having multiple routers.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.• 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 Action
