Juniper QFX3000-G QFabric, Deployment Manual, Page: 643 / 652

If the software on your QFabric system is damaged in some way that prevents the software
from loading correctly, or you need to upgrade the software on your QFabric system, you
may need to perform a recovery installation on the Director group.
If possible, perform the following steps before you perform the recovery installation:
1.
Ensure that you have an emergency boot device (for example, an external USB flash
drive) for each of your Director devices to use during the recovery installation.
You can either use the external USB flash drive containing the software supplied by
Juniper Networks, or you can use an external USB flash drive supplied by Juniper
Networks on which you install the QFabric system install media.
2.
Because the recovery installation process completely overwrites the entire contents
of the Director device, make sure you back up any configuration files and initial setup
information on a different external USB flash drive before you begin a recovery
installation. You will need to restore this information as part of recovery process.
Use the
request system software configuration-backup
command to back up your
configuration files and initial setup information:
user@switch> request system software configuration-backup path
NOTE: To recover the Director group, you must upgrade both Director devices
in parallel. If you are recovering only one Director device in a Director group,
and the software version will remain the same between the two Director
devices, make sure that the other Director device is powered on and
operational. If the software version of the Director device you are recovering
will be different, make sure that the other Director device is powered off and
is not operational.
•
(Optional) Creating an Emergency Boot Device Using a Juniper Networks External
Blank USB Flash Drive on page 617
• Performing a Recovery Installation Using a Juniper Networks External USB Flash Drive
with Preloaded Software on page 618
(Optional) Creating an Emergency Boot Device Using a Juniper Networks External Blank USB
Flash Drive
Supported Platforms
If you do not have an external USB flash drive preloaded with the software from Juniper
Networks to use as an emergency boot device, you can create your own, using a blank
external USB flash drive provided by Juniper Networks. Download the install media from
the Juniper Networks Support website onto your UNIX workstation, uncompress and
untar the software, and then burn the software image onto your Juniper Networks external
USB (4-gigabyte) flash drive. Make sure you create two emergency boot devices, one
for each Director device, so you can perform a recovery installation in parallel.
1.
Using a Web browser, navigate to the http://www.juniper.net/support .
2.
Click Download Software .
617 Copyright © 2015, Juniper Networks, Inc.
Chapter 22: QFabric System Troubleshooting