R3102-R3103-HP 6600/HSR6600 Routers Fundamentals Configuration Guide

107
To ensure a successful backup, verify that the router 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.
6604/6608/6616
The file overwrite and backup operations are performed on both active MPU and standby MPU,
regardless of whether configuration auto-update is enabled.
If the backup attempt fails on the standby MPU, choose one of the following failure handling actions at
prompt:
• Give up saving the configuration—The system does not save the running configuration on any
MPU.
• Overwrite the configuration file—The system uses the running configuration to overwrite the old
configuration file on the MPU without backing up the file. You can copy the backup configuration
file from the 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.