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Upgrade and Downgrade Instructions for Junos OS Release 12.3 for ACX Series Routers

This section discusses the following topics:

Basic Procedure for Upgrading to Release 12.3

When upgrading or downgrading Junos OS, always use the jinstall package. Use other packages (such839696 as the jbundle package) only when so instructed by a Juniper Networks support representative. For information about the contents of the jinstall package and details of the installation process, see the Junos OS Installation and Upgrade Guide PDF Document.

Note: Before upgrading, back up the file system and the currently active Junos OS configuration so that you can recover to a known, stable environment in case the upgrade is unsuccessful. Issue the following command:

user@host> request system snapshot

The installation process rebuilds the file system and completely reinstalls Junos OS. Configuration information from the previous software installation is retained, but the contents of log files might be erased. Stored files on the routing platform, such as configuration templates and shell scripts (the only exceptions are the juniper.conf and ssh files), might be removed. To preserve the stored files, copy them to another system before upgrading or downgrading the routing platform. For more information, see Understanding System Snapshot on an ACX Series Router.

The download and installation process for Junos OS Release 12.3 is different from previous Junos OS releases.

  1. Using a Web browser, navigate to the All Junos Platforms software download URL on the Juniper Networks web page:

  2. Select the name of the Junos platform for the software that you want to download.
  3. Select the release number (the number of the software version that you want to download) from the Release drop-down list to the right of the Download Software page.
  4. Select the Software tab.
  5. In the Install Package section of the Software tab, select the software package for the release.
  6. Log in to the Juniper Networks authentication system using the username (generally your e-mail address) and password supplied by Juniper Networks representatives.
  7. Review and accept the End User License Agreement.
  8. Download the software to a local host.
  9. Copy the software to the routing platform or to your internal software distribution site.
  10. Install the new jinstall package on the routing platform.

    Note: We recommend that you upgrade all software packages out of band using the console because in-band connections are lost during the upgrade process.

    Customers in the United States and Canada use the following command:

    user@host> request system software add validate reboot source/jinstall-12.3R12 1-domestic-signed.tgz

    All other customers use the following command:

    user@host> request system software add validate reboot source/jinstall-12.3R12 1-export-signed.tgz

    Replace source with one of the following values:

    • /pathname—For a software package that is installed from a local directory on the router.
    • For software packages that are downloaded and installed from a remote location:

      • ftp://hostname/pathname
      • http://hostname/pathname
      • scp://hostname/pathname (available only for Canada and U.S. version)

    The validate option validates the software package against the current configuration as a prerequisite to adding the software package to ensure that the router reboots successfully. This is the default behavior when the software package being added is a different release.

    Adding the reboot command reboots the router after the upgrade is validated and installed. When the reboot is complete, the router displays the login prompt. The loading process can take 5 to 10 minutes.

    Rebooting occurs only if the upgrade is successful.

Note: After you install a Junos OS Release 12.3 jinstall package, you cannot issue the request system software rollback command to return to the previously installed software. Instead you must issue the request system software add validate command and specify the jinstall package that corresponds to the previously installed software.

Upgrade and Downgrade Support Policy for Junos OS Releases

Support for upgrades and downgrades that span more than three Junos OS releases at a time is not provided, except for releases that are designated as Extended End-of-Life (EEOL) releases. EEOL releases provide direct upgrade and downgrade paths—you can upgrade directly from one EEOL release to the next EEOL release even though EEOL releases generally occur in increments beyond three releases.

You can upgrade or downgrade to the EEOL release that occurs directly before or after the currently installed EEOL release, or to two EEOL releases before or after. For example, Junos OS Releases 10.0, 10.4, and 11.4 are EEOL releases. You can upgrade from Junos OS Release 10.0 to Release 10.4 or even from Junos OS Release 10.0 to Release 11.4. However, you cannot upgrade directly from a non-EEOL release that is more than three releases ahead or behind. For example, you cannot directly upgrade from Junos OS Release 10.3 (a non-EEOL release) to Junos OS Release 11.4 or directly downgrade from Junos OS Release 11.4 to Junos OS Release 10.3.

To upgrade or downgrade from a non-EEOL release to a release more than three releases before or after, first upgrade to the next EEOL release and then upgrade or downgrade from that EEOL release to your target release.

For more information on EEOL releases and to review a list of EEOL releases, see

Downgrading from Release 12.3

To downgrade from Release 12.3 to another supported release, follow the procedure for upgrading, but replace the 12.3 jinstall package with one that corresponds to the appropriate release.

Note: You cannot downgrade more than three releases. For example, if your routing platform is running Junos OS Release 11.4, you can downgrade the software to Release 10.4 directly, but not to Release 10.3 or earlier; as a workaround, you can first downgrade to Release 10.4 and then downgrade to Release 10.3.

For more information, see the Junos OS Installation and Upgrade Guide PDF Document.

Related Documentation

Modified: 2016-06-09