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Software Installation Overview

A QFX Series product is delivered with the Junos OS preinstalled. As new features and software fixes become available, you can upgrade your software to use them.

When you power on the switch, it starts (boots) using the installed software.

You upgrade the Junos OS on a switch by copying a software package to a switch or other system on your local network and then using the CLI to install the new software on the switch. You then reboot the switch, which boots from the upgraded software. After a successful upgrade, you should back up the new current configuration to a secondary device.

During a successful upgrade, the installation package removes all files from the /var/tmp directory of the switch and completely reinstalls the existing software. It retains configuration files, and similar information, such as secure shell and host keys, from the previous version. The previous software package is preserved in a separate disk partition, and you can manually revert to it if necessary. If the software installation fails for any reason, such as loss of power during the installation process, the system returns to the originally active installation when you reboot.

If you encounter any difficulties during software installation or an upgrade, you can use the recovery installation procedure to install the Junos OS on the switch.

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