Juniper SRX Series: Creating and managing the “Rescue Configuration”.

A rescue configuration allows administrators to define a known working configuration or a configuration with a known state that can be loaded (this is called a configuration roll-back) at any time.

This alleviates the necessity (on Junper devices) of having to remember the rollback number with the rollback command.
Rescue configuration can be used to roll back to a known configuration or as a last resort if device configuration and backup configuration files became damaged beyond repair.

To create a rescue configuration, it is possible to use the request system configuration rescue save operational mode command:

twister@gw-srx> request system configuration rescue save

To roll back to the rescue configuration, the rollback rescue command can be used:

twister@gw-srx> rollback rescue
load complete

After rolling back to the rescue configuration, you must commit the configuration to activate it:

twister@gw-srx> commit

On SRX Branch devices, it is also possible to press and quickly release the Reset Config Button to load and commit the rescue configuration.
The Reset Config button is recessed to prevent it from being pressed accidentally.

By default, pressing and quickly releasing the Reset Config Button loads and commits the rescue configuration. The Status LED is amber and steadily on during this time.
By default, pressing and holding the Reset Config button for 15 seconds or more, until the Status LED is amber and steadily on, deletes all configurations on the device (including the backup configurations and rescue configuration) and loads and commits the factory configuration.

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