show pre-8090-startup-backup

If no startup-config file is present or if no backup file is present, the system displays an error message.

If a pre-08.0.90 backup startup-config file is present, the system displays the message "pre-8.0.90 backup startup-config: generated by xx version number."

Downgrading from a FastIron 08.0.90 or later image to a pre-08.0.90 FastIron image may break a stack because of stacking port representation changes. Therefore, the system automatically backs up the startup-config file in case the customer needs to downgrade to the original release after the upgrade.

The backup file is only for use when you have upgraded to FastIron release 08.0.90 or later and then need to perform a downgrade. It is not intended for any other purpose.

Whenever you perform an upgrade from a pre-08.0.90 release to FastIron release 08.0.90 or later, the system automatically backs up its startup-config file when you enter the write terminal command. Whenever a system downgrades from FastIron release 08.0.90 or later to a pre-08.0.90 release, the system renames the backup file as startup-config before the downgrade and reloads.

The backup file replaces the startup-config file during the downgrade. There is no merge. Therefore, all configuration changes made after the software upgrade are lost. If you have changed any configuration following the upgrade, be sure to copy the startup-config file or running-config to the directory tftp/scp/usb using the command copy startup-config or the command copy running-config. Then manually enter the configuration differences after downgrading.