| Solution |
In some cases, the FortiSwitch may become unresponsive after an unexpected power cycle, resulting in a loss of configuration. This is due to the FortiSwitch booting from an undesired/inactive partition.
Here are the steps to identify, troubleshoot, and resolve the issue
- FortiSwitch, like the FortiGate, has two boot partitions. To check this, run the following command:
diagnose sys flash list
Example output:
FS1E48T422003949 # diagnose sys flash list
Partition Image TotalSize(KB) Used(KB) Use% Active
1 FS1E48-7.02-FW-build0479-240214-patch07 55529 45385 81% No
71395 1397 2% No
(*) 2 FS1E48-7.00-FW-build0092-230126-patch06 55529 37248 67% Yes
71391 1388 2% Yes
Flag * : next-boot partition
Image build at Jan 26 2023 14:01:37 for b0092
In this output, the (*) indicates the active partition.
- If the switch has booted from a version other than the one it was on before the power cycle, it means that the switch has booted from the other partition. Hence, the loss of connectivity.
- To resolve this issue, boot the switch from the non-active partition. Here are the steps and commands for this process.
- Disable image rotation on the FortiSwitch under the global settings.
config system global
set image-rotation disable
end
- Set the next reboot partition to primary/secondary. It should be the inactive partition.
execute set-next-reboot <primary/secondary>
- Reboot the FortiSwitch. This will boot it from the other partition, which contains the latest configuration, and the connectivity will be restored after the reboot.
execute reboot
- Re-enable the image rotation to set it to the default value.
config system global
set image-rotation enable
end
Use the following workaround to avoid this issue:
- Make sure that the FortiSwitch is on the correct partition and has all the configuration needed.
- Run the 'show system global' command to check the image-rotation configuration and ensure it's enabled. If 'set image-rotation disable' is set, then run unset or 'set image-rotation enable'.
config system global
unset image-rotation
end
- Once it is confirmed that the image rotation is enabled, upgrade your FortiSwitches to the same firmware version. In our case above, upgrade the FortiSwitch to 7.0.6 build 0092, as it has an up-to-date configuration.
- Now, even in cases where the FortiSwitch boots from the incorrect partition, it should still have the updated configuration. There should not be any connectivity failures or network outages. The following is an example of how the flash list output should look:
FS1E48T419000449 # diagnose sys flash list
Partition Image TotalSize(KB) Used(KB) Use% Active
(*) 1 FS1E48-7.00-FW-build0092-230126-patch06 55529 37248 67% Yes
71395 1388 2% Yes
2 FS1E48-7.00-FW-build0092-230126-patch06 55529 37248 67% No
71391 1390 2% No
Here, both the primary and the secondary partition are on 7.0.6 build 0092.
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