H3C Technologies H3C S12500 Series Switches - Manual (Page 112)

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• Overwrite the configuration file—The system uses the running configuration to overwrite the old
configuration file on the MPU without backing up the file. In standalone mode, you can copy the
backup configuration file from the active MPU to the standby MPU for future rollback. In IRF mode,
you can copy the backup configuration file from the global active MPU to the standby MPU for
future rollback.
Make sure each MPU has enough space for the backup configuration file and the new next-startup
configuration file.
To load the backup configuration file after a software downgrade, specify the backup file as the
next-startup configuration file on each MPU.
Configuring configuration rollback
To replace the running configuration with the configuration in a configuration file without rebooting the
device, use the configuration rollback function. This function helps you revert to a previous configuration
state or adapt the running configuration to different network environments.
The configuration rollback function compares the running configuration against the specified
replacement configuration file and handles configuration differences as follows:
• If a command in the running configuration is not in the replacement file, the rollback function
executes the undo form of the command.
• If a command in the replacement file is not in the running configuration, the rollback function adds
the command to the running configuration.
• If a command has different settings in the running configuration and the configuration file, the
rollback function replaces the running command setting with the setting in the configuration file.
To facilitate configuration rollback, the configuration archive function was developed. This function
enables the system to save the running configuration automatically at regular intervals as checkpoint
references.
Configuration task list
Task Remarks
Configuring configuration archive parameters Required.
• Enabling automatic configuration archiving
• Manually archiving running configuration
Required.
Use either method.
Rolling back configuration Required.
Configuring configuration archive parameters
Before archiving the running configuration, either manually or automatically, you must configure a file
directory and file name prefix for configuration archives.
Configuration archives are saved with the file name format prefix_serial number.cfg, for example,
20080620archive_1.cfg and 20080620archive_2.cfg. The serial number is automatically assigned from
1 to 1000, increasing by 1. After the serial number reaches 1000, it restarts from 1.