Installing Software Package on a PTX Device with Single Routing Engine
Follow the below procedure to install a software package:
(Optional) Back up the current software configuration to a second storage option. See the Junos® OS Evolved Software Installation and Upgrade Guide for instructions on performing this task.
Ensure that you have downloaded the software package, see Downloading Software Package from Juniper Networks.
Junos OS Evolved is delivered in signed package that contain digital signatures to ensure the Juniper Networks software is running. When installing the software package, Junos OS Evolved validates the signatures and the public key certificates used to digitally sign the software package. If the signature or certificate is found to be invalid (for example, when the certificate validity period has expired or cannot be verified against the root CA stored in the Junos OS Evolved internal store), the installation process fails.
To install software upgrades on a device with a single Routing Engine: