Troubleshooting Software Installation
- Recovering from a Failed Software Upgrade on an EX Series Switch
- Rebooting from the Inactive Partition
Recovering from a Failed Software Upgrade on an EX Series Switch
Problem
If the JUNOS Software loads but the CLI is not working for any reason, or if the switch has no software installed, you can use this recovery installation procedure to install the JUNOS Software.
Solution
If there is already a JUNOS image on the system, you can install the new JUNOS package in a separate partition and both JUNOS images will remain on the system, or you can wipe the disk clean before the new installation proceeds.
If there is no JUNOS image on the system, follow the instructions in Booting an EX Series Switch Using a Software Package Stored on a USB Flash Drive to get an image on the system and boot the switch.
To perform a recovery installation:
- Power on the switch. The loader script starts.
After the message Loading /boot/defaults/loader.conf displays, you are prompted with:
Hit [Enter] to boot immediately, or space bar for command prompt.
- Press the space bar to enter the manual loader. The loader> prompt displays.
- Enter the following command:
where:
- format—Use this option to wipe the installation media before installing the software package. If you do not include this option, the system installs the new JUNOS Software package in a different partition from that of the most recently installed JUNOS Software package.
- external—Use this option to install the software package onto an external media.
- source—Represents the name and location
of the JUNOS Software package either on a server on the network or
as a file on the USB flash drive:
- Network address of the server and the path on the server; for example, tftp://192.17.1.28/junos/jinstall-ex-4200-9.4R1.5-domestic-signed.tgz
- The JUNOS package on a USB device is commonly stored in the root drive as the only file; for example, file:///jinstall-ex-4200-9.4R1.5-domestic-signed.tgz
The boot process proceeds as normal and ends with a login prompt.
Rebooting from the Inactive Partition
Problem
An EX Series switch ships with the JUNOS Software loaded on the system disk in partition 1. The first time you upgrade, the new software package is installed in partition 2. When you finish the installation and reboot, partition 2 becomes the active partition. Similarly, subsequent software packages are installed in the inactive partition which becomes the active partition when you reboot at the end of the installation process.
If you performed an upgrade and rebooted, the system resets the active partition. You can use this procedure to manually boot from the inactive partition.
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Note: If you have completed the installation of the software image but have not yet rebooted, you can issue the request system software rollback command to return to the original software installation package. |
Solution
Reboot from the inactive partition:
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Note: If you cannot access the CLI, you can reboot from the inactive partition using the following procedure from the loader script prompt:
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