CHAPTER 33
Restoring Junos OS
•
Creating an Emergency Boot Device for a QFX Series Device on page 407
•
Performing a Recovery Installation on a QFX3500 Device and QFX3008-I Interconnect
Device on page 409
•
Performing a QFabric Switch Recovery Installation on the Director Group on page 410
•
Performing a Recovery Installation of the Director Group on page 420
Creating an Emergency Boot Device for a QFX Series Device
If Junos OS on your QFX Seriesdevice is damagedin some way thatprevents 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: The following procedure assumes that you are creating the device on
a QFX3500 device. 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 from a QFX3500 device:
1. Use FTP to copy the installation media image into the /var/tmp directory on the
QFX3500 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
407Copyright © 2012, Juniper Networks, Inc.
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