Overview on Upgrade and Downgrade Procedures for the J Series Services Routers

Typically, you upgrade your device software by downloading a software image to your device from another system on your local network. Using the J-Web interface or the CLI to upgrade, the device downloads the software image, decompresses the image, and installs the decompressed software. Finally, you reboot the device, at which time it boots from the upgraded software. Junos OS is delivered in signed packages that contain digital signatures to ensure official Juniper Networks software. For more information about signed software packages, see the Junos OS Installation and Upgrade Guide.

• Upgrade Software Packages
• Recovery Software Packages

Upgrade Software Packages

An upgrade software package name is in the following format:

package-name-m.nZx-distribution.tgz.

• package-name — Name of the package—for example, junos-jsr.
• m.n — Software release, with m representing the major release number and n representing the minor release number—for example, 8.5.
• Z — Type of software release. For example, R indicates released software, and B indicates beta-level software.
• x.y — Software build number and spin number—for example, 1.1.
• distribution — Area for which the software package is provided—domestic for the United States and Canada and export for worldwide distribution.

Example:

junos-jsr-8.5R1.1-domestic.tgz.

Recovery Software Packages

Download a recovery software package, also known as an install media package, to recover a primary CompactFlash card.

A recovery software package name is in the following format:

package-name-m.nZx-export-cfnnn.gz.

• package-name — Name of the package; for example, junos-jsr.
• m.n — Software release, with m representing the major release number—for example, 8.5.
• Z — Type of software release. For example, R indicates released software, and B indicates beta-level software
• x.y — Software build number and spin number—for example, 1.1.
• export — export indicates that the recovery software package is the exported worldwide software package version
• cfnnn — Size of the target CompactFlash card in megabytes; for example, cf256

Example:

junos-jsr-8.5R1.1-export-cf256.gz

The following CompactFlash card sizes are supported:

• 512 MB
• 1024 MB

Note: The CompactFlash cards with less than 512 MB of storage capacity are not supported