This document shows the steps to troubleshoot the “Unknown error 0” message on Catalyst 6500 Series Switch.
Have basic knowledge on administration of the Catalyst 6500 Series switch.
Getting “Unknown error 0” message on Catalyst 6500 Series switch.
The switch throws the following error message:
This issue occurs on switch when you have version mismatch between the redundant supervisors. No action can be done from the active supervisor to the backup supervisor.
Perform the following steps to resolve the issue:
Format the external flash by using the format disk1 command on the privileged mode.
Copy the correct image s72033-adventerprisek9_wan-mz.122-33.SXH3a to the external flash.
Then insert the external flash back to the secondary supervisor.
Rommon 1 > boot disk1:s72033-adventerprisek9_wan-mz.122-33.SXH3a
Cisco Catalyst 6500 Series Switches