Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
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3.14 Communication failures in the high-reliability functionality
3.14.1 GSRP communication failures
If communication is not possible in a GSRP configuration, isolate the cause of the problem
according to the failure analysis method described in the following table.
Table 3-67: Communication failure analysis method for a GSRP configuration
If intended switching between master and backup states does not occur in a GSRP configuration,
isolate the cause of the problem according to the failure analysis method described in the following
table.
No. Items to check and commands Action
1 On the Switch and partner device that
make up a GSRP group, execute the
show gsrp command, and check the
status of the VLAN group containing
the target VLAN that causes the
communication failure.
If the state of one of them is
Master and the state of the other is other
than Master, go to No. 2.
If the state of one of them is
Backup(No Neighbor), resolve the
communication problem in the direct link. GSRP Advertise frames might
have been discarded either by filtering or by bandwidth monitoring, drop
control, or the QoS control shaper. See 3.25.1 Checking the filters and
QoS configuration information and check for a problem.
If necessary, on the one whose state is
Backup(No Neighbor) use the
set gsrp master command to change the state to Master.
If the state of both of them is either Backup or Backup(Waiting), make
sure that the method for selecting the master or backup state
(
Selection-Pattern) is the same between the devices.
If the state of both of them is Backup(Lock), cancel the lock state of one
or both of them.
If the state of both of them is
Master, use the restart gsrp command
to restart the GSRP program on one of them.
For other cases, the devices are temporarily undergoing a status
transition. Wait a while until communication is restored.
2 Check the status of the target VLAN
port on the Switch and the devices on
the communication path.
If the target VLAN port on the Switch or a device on the communication
path has a failure, restore the device.
If all of the following conditions are met, use the
activate command to
activate the target VLAN port:
• The method for flushing the MAC address table of the target VLAN
port is
Reset. (To check this, use the show gsrp command with the
port parameter.)
If the target VLAN port on the Switch and the devices on the
communication path have no problem, go to No. 3.
3Use the
show gsrp command with the
port parameter to check the method
(GSRP, Reset, or No) for flushing the
MAC address table of the target VLAN
port on the Switch.
If the method for flushing the MAC address table is
GSRP or Reset and
is not suitable for the current GSRP configuration, modify the
gsrp
reset-flush-port or gsrp no-flush-port configuration
command.
If the method for flushing the MAC address table is
GSRP or Reset and
is suitable for the current GSRP configuration, use the restart gsrp
command to restart the GSRP program on the Switch.
If the method for flushing the MAC address table is
No, wait a while until
aging occurs on the MAC address table for the neighboring device on the
communication path.