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Roll Back the Software to a Previous Version

SUMMARY Junos OS Evolved maintains multiple versions of the software and configuration files on the primary solid-state drive (SSD) on the Routing Engine. Each time you issue the request system software add operational mode command, the previous software image and configuration is preserved automatically. The last running software image and corresponding configuration file is the default rollback image. Older images, along with the configuration present when the older image was running, are preserved as well.

You use the rollback image and configuration preserved by default to revert to a prior image on the same disk as the current image.

After an upgrade or a roll back, if the software is unable to use the current configuration, the Routing Engine is often still reachable using the current management interface configuration. If the management interface does not come up, use the console to connect to the device to roll back the software and configuration.

After an upgrade, if the installation fails during early boot, the Routing Engine automatically reverts to booting from the secondary SSD, where snapshots are stored. You can then reboot the Routing Engine using the snapshot saved on the secondary SSD. You can then roll back the software version, especially if the snapshot version is not a recent-enough version of the software and configuration.

For a dual-Routing Engine device, the request system software rollback operational mode command reverts both Routing Engines to the rollback software version. For all devices, the command rolls back the software version on the FPCs as well.

  • To see which software images are available for rollback, use the show system software list operational mode command.
  • To roll back to any image with the current configuration (the snapshot configuration), use the request system software rollback package-name operational mode command.
  • To roll back to the last running image with its corresponding configuration from when the software was last running, use the request system software rollback with-old-snapshot-config operational mode command.
  • To roll back to any image and its corresponding configuration, use the request system software rollback package-name with-old-snaphot-config operational mode command.

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