3. Troubleshooting Functional Failures in Operation1033.13 Communication Failure on High-reliability Function3.13.1 GSRP Communication FailuresIf the communication is not possible in the GSRP configuration, isolate the problem according to the failure analysismethod shown in the table below.Table 3-58: Analysis Method for Communication Failure in GSRP ConfigurationIf master/backup is not switched as expected in the GSRP configuration, isolate the problem using the failure analysismethod shown in the table below.No. Troubleshooting Steps and Command Action1 On this system and remote systemconstituting a GSRP group, check the statusof the VLAN group to which the failedVLAN belongs using the show gsrpcommand.Go to No. 2 if one system is master and the other system is non-master.If either system is Backup (No Neighbor), recover from the communication failurebetween direct links. GSRP Advertise frames may have been discarded byfiltering, or GSRP Advertise frames may have been discarded through bandwidthmonitoring, discarding control, or shaper of the QoS control.See "3.23.1 Checking Filtering/QoS Setting Information" to check for it.If necessary, change the system that is Backup (No Neighbor) to Master using theset gsrp master command.If both systems are Backup or Backup (Waiting), check to see if the master/backupselection method (Selection-Pattern) is the same between the systems.If both systems are Backup (Lock), reset the lock status of either or both systems.If both systems are Master, restart either GSRP program using the restartgsrp command.In other cases, temporary status transition is in progress. Wait for a while for thecommunication to recover.2 Check the status of the VLAN port on thissystem and systems on the communicationpath.Restore the failed VLAN port on this system or systems on the communicationpath.If the conditions below are all met, activate the VLAN port using the activatecommand.• The MAC address table flash method for the current VLAN port is "Reset"(determine by using the show gsrp command with "port" parameterspecified).Go to No. 3 if there is no failure on the VLAN port of this system or systems onthe communication path.3 Check the MAC address table flash method(GSRP/Reset/No) to the VLAN port on thissystem using the show gsrp commandwith "port" parameter specified.If the MAC address table flash method is either GSRP or Reset and does not matchthe configuration, correct it using configuration command gsrpreset-flash-port and gsrp no-flash-port.If the MAC address table flash method is either GSRP or Reset and matches theconfiguration, restart the GSRP program on this system with the restart gsrpcommand.If the MAC address table flash method is No, wait for aging of MAC address tableon the neighboring system on the communication path.
