Juniper EX4600, Hardware Manual, Page: 217 / 230

CHAPTER 24
Restoring Junos OS
• Creating an Emergency Boot Device on page 199
• Performing a Recovery Installation on page 201
Creating an Emergency Boot Device
If Junos OS on the device is damaged in some way that prevents the software from
loading properly, you can use an emergency boot device to repartition the primary disk
and load a fresh installation of Junos OS. Use the following procedure to create an
emergency boot device.
Before you begin, you need to download the installation media image for your device
and Junos OS release from
http://www.juniper.net/customers/support/ .
NOTE: In the following procedure, we assume that you are creating the
emergency boot device on a switch. You can create the emergency boot
device on another Juniper Networks switch or router, or any PC or laptop that
supports Linux. The steps you take to create the emergency boot device vary,
depending on the device.
To create an emergency boot device:
1.
Use FTP to copy the installation media image into the
/var/tmp
directory on the device.
2.
Insert a USB device into the USB port.
3.
From the Junos OS command-line interface (CLI), start the shell:
user@device> start shell
%
4.
Switch to the root account using the
su
command:
% su
Password: password
NOTE: The password is the root password for the device. If you logged in
to the device as root, you do not need to perform this step.
199 Copyright © 2014, Juniper Networks, Inc.