R0106-HP MSR Router Series Fundamentals Configuration Guide(V7)

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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
Tasks at a glance
(Required.) Configuring configuration archive parameters
(Required.) Perform either task:
• Enabling automatic configuration archiving
• Manually archiving the running configuration
(Required.) Rolling back configuration
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.
After you change the file directory or file name prefix, or reboot the device, all the following events occur:
• The old configuration archives are regarded as common configuration files.
• The configuration archive counter is reset.
• The display archive configuration command no longer displays the old configuration archives.
• The serial number for new configuration archives starts at 1.
After the maximum number of configuration archives is reached, the system deletes the oldest archive to
make room for the new archive.