Troubleshooting guide

3. Troubleshooting Functional Failures During Operation
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3.14.3 Communication is not possible with the VRRP configuration of IPv6
networks
If communication is not possible in a VRRP configuration, isolate the cause of the problem
according to the failure analysis method described in the following table.
If ADVERTISEMENT packets are received correctly, check the remote
device.
If ADVERTISEMENT packets are not received, go to No. 8.
8 Execute the
show interfaces
command and check the statistics for
the physical port to which a remote
device that makes up the same virtual
router is connected.
Also, execute the
show cpu command
to check the CPU usage.
For the physical port to which a remote device that makes up the same
virtual router is connected, you might find that the
Input rate and
Output rate values are large and the line load is high. In addition, the
CPU usage displayed by using the
show cpu command might be high. If
these are the cases, take the following actions:
• If a loop occurs in the line, check the use of STP and the physical
network configuration, and resolve the loop.
• Use the
vrrp timers advertise configuration command to set a
longer sending interval for ADVERTISEMENT packets.
• Use the
vrrp preempt delay configuration command to set the
automatic switchback suppression time.
If the load at the physical port is not high, go to No. 9.
9 Make sure that there is no filtering
setting for discarding
ADVERTISEMENT packets.
If there is such a filtering setting, modify the setting so that
ADVERTISEMENT packets are not discarded.
If such a filtering setting does not exist, check the operating status of the
remote device that makes up the same virtual router.
10 If the fault-monitoring interface is set,
check the status of the fault-monitoring
interface.
Make sure that another virtual router is set on the interface for which the
fault-monitoring interface is set and the fault-monitoring interface of the
virtual router is not the interface of the target virtual router. If the
fault-monitoring interface of the virtual router is the interface of the
target virtual router, delete the setting of either of the fault-monitoring
interfaces.
If there is no setting of the fault-monitoring interface described above, go
to No. 11.
11 Execute the
show vrrpstatus
command with the detail parameter,
and make sure that the status of the
virtual router is not
Initial.
If the status of the virtual router is
Initial, check the following:
• If the current priority is not zero, resolve the cause of disabling the
virtual router that is displayed for
Admin State. (For details about
the cause of disabling the virtual router, see the manual Operation
Command Reference.)
• For AX3800S or AX3600S series switches, execute the
show
logging command to check the log. If the log contains The VRRP
virtual MAC address entry can't be registered at
hardware tables., the setting of the MAC address table has failed
on the hardware. The virtual router might be enabled if you do the
following. Delete the configuration of the target virtual router, and
then set the configuration again with a different virtual router number
or change the VLAN ID of the VLAN for which the virtual router is
set.
If the status of the virtual router is not
Initial, check the operating
status of the remote device that makes up the same virtual router.
No. Items to check and commands Action