Installing Software on MX204 or EX9251 devices with Single Routing Engine

You can use this procedure to upgrade Junos OS on device with a single Routing Engine.

1. Download the software package as described in Downloading Software Packages from Juniper Networks.
2. If you have not already done so, connect to the console port on the device from your management device, and log in to the Junos OS CLI.
3. (Optional) Back up the current software configuration to a second storage option. See the Junos OS Installation and Upgrade Guide for instructions on performing this task.
4. (Optional) Copy the software package to the device. We recommend that you use FTP to copy the file to the /var/tmp/ directory.

   This step is optional because Junos OS can also be upgraded when the software image is stored at a remote location. These instructions describe the software upgrade process for both scenarios.

5. Install the new package on the MX device:

   Replace package with one of the following paths:

   • For a software package in a local directory on the device, use /var/tmp/package.tgz.

   • For a software package on a remote server, use one of the following paths, replacing package with the software package name—for example, junos-vmhost-install-mx-x86-64-19.2R1.tgz.

     • ftp://hostname/pathname/package.tgz

     • http://hostname/pathname/package.tgz

6. Reboot the device to load the installation:
7. After the reboot has completed, log in and use the show version command to verify that the new version of the software is successfully installed.