This is an old revision of the document!
Junos Recovery on QFX5100/EX4600
It’s possible that after a failed installation, the QFX5100 might not work properly and be left in a state that makes it inaccessible from remote and needs a new software installation by copying the software from the USB to the QFX5100 or by using the installation from USB.
There is another way to recover the device if you have console access and you are still able to reboot the device from CLI. From CLI, you will need to reboot completely the device, including the CentOS on top of which the Junos VM is running. This is done using “request system reboot hypervisor”. If the CLI is not working, then a power cycle will be needed.
A recovery image is created automatically on the switches. If a previously-running switch is powered on and unable to boot using a Junos OS image, you can boot the switch using the recovery Junos OS image by selecting one of the saved images.
Because the architecture of EX4600 is identical with the one of QFX5100, the same process applies to EX4600.
After the hypervisor reboot, monitor the console and you should see this screen:
