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Validate the Configuration against the Installation Image

SUMMARY When you upgrade or downgrade the Junos OS Evolved image on a device, the system validates that the existing configuration is compatible with the new image before the actual upgrade or downgrade commences.

Before you upgrade or downgrade Junos OS Evolved on your device, you should validate the device's current configuration against the installation image you've downloaded from Juniper Networks Support.

Validation is on by default. You do not need to configure it or issue any command to start it on a device.

When you upgrade or downgrade the Junos OS Evolved image on a device, the system validates that the existing configuration is compatible with the new image before the actual upgrade or downgrade commences.

Benefits of validation—If validation fails, the new image is not loaded and an error message provides information about the failure. If you upgrade or downgrade the software on a system without validation, configuration incompatibilities between the existing and new image or insufficient memory to load the new image might cause the system to lose its current configuration or go offline.

To invoke validation manually, do one of the following:

  • Issue the request system software add image-name operational mode command to install the package with validation.
  • Issue the request system software validate operational mode command to just validate the configuration.

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