There are several ways to update your JunOS software but one of the common and safe method is doing through the CLI and a USB memory stick.
Juniper Certified Pre-Owned switches enable you to enhance your network with previously owned, less expensive equipment that is officially certified by Juniper Networks. Every Juniper Certified Pre-Owned switch has been thoroughly refurbished and contains the Juniper’s latest revision of software and firmware.
First, get your software from Juniper.net first and save it to a MSDOS formatted USB stick.
Then, follow those steps (as root, through serial console is highly recommended) :
1. Connect the USB stick to your Juniper device (you should have an output on the console after connecting the device letting you know the device name). Note that you need to be into the Unix shell to perform the following step, the prompt will be displayed as ” % “.
Try to locate your device and his volume doing the following command :
Command
(in this example the device and volume will be “da1” and “da1s1“)
2. Mount your USB drive using the following commands :
Commands