close

keyboard_arrow_left

Table of Contents Expand all

play_arrow Fast Track: Initial Installation
- Fast Track to Rack Installation and Power
- Onboard, Configure, and Monitor MX10008
play_arrow Overview
play_arrow Site Planning, Preparation, and Specifications
play_arrow Initial Installation and Configuration
play_arrow Maintaining Components
play_arrow Troubleshooting Hardware
- Restoring Junos OS
- Alarm Messages
play_arrow Contacting Customer Support and Returning the Chassis or Components
- Contact Customer Support
- Returning the MX10008 Chassis or Components
play_arrow Safety and Compliance Information

list Table of Contents

English

Restoring Junos OS

date_range 01-May-22

arrow_backward

arrow_forward

Creating an Emergency Boot Device

Before you begin, you need to download the installation media image for your device and Junos OS release from https://www.juniper.net/customers/support/ .

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.

Note:

You can create the emergency boot device on another Juniper Networks router 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:

Use FTP to copy the installation media image into the /var/tmp directory on the device.
Insert a USB device into the USB port.
From the Junos OS command-line interface (CLI), start the shell:
```
user@device> start shell
% 
```
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.

Enter the following command on the device:

content_copy zoom_out_map
root@device% dd if=/var/tmp/filename of=/dev/da1 bs=16k

The device writes the installation media image to the USB device:

content_copy zoom_out_map
root@device% dd if=install-media-qfx-5e-15.1X53-D30.5-domestic.img of=/dev/da0 bs=1m
1399+0 records in
1399+0 records out
1466957824 bytes transferred in 394.081902 secs (3722469 bytes/sec)

Enter the following command:
```
root@device% dd if=/var/tmp/filename of=/dev/da0 bs=1048576
```
The device writes the installation media image to the USB device:
```
root@device% dd if=/var/tmp/jinstall-vjunos-usb-13.2.img of=/dev/da0 bs=1048576
11006+1 records in
11006+1 records out
180332544 bytes transferred in 71.764266 secs (2512846 bytes/sec)
```
Note:
The device automatically create a recovery Junos OS image.

The “Select a recovery image” menu appears on the console when one of these routers is booted and unable to load a version of Junos OS. You can follow the instructions in the “Select a recovery image” menu to load the Junos OS image for one of these routers.
Log out of the shell:
```
root@device% exit
% exit
user@device>
```

Performing a Recovery Installation Using an Emergency Boot Device

If Junos OS on your device is damaged in some way that prevents the software from loading correctly, you might need to perform a recovery installation using an emergency boot device (for example, a USB flash drive) to restore the default factory installation. After you have recovered the software, you need to restore the device configuration. You can either create a new configuration as you did when the device was shipped from the factory, or if you saved the previous configuration, you can simply restore that file to the device.

We recommend that you perform the following steps before you perform the recovery installation:

Ensure that you have an emergency boot device to use during the installation. See Creating an Emergency Boot Device for information about how to create an emergency boot device.
Copy the existing configuration in the file /config/juniper.conf.gz from the device to a remote system, such as a server, or to an emergency boot device. For extra safety, you can also copy the backup configurations (the files named /config/juniper.conf.n, where n is a number from 0 through 9) to a remote system or to an emergency boot device.

You can use the system snapshot feature to complete this step. The system snapshot feature takes a “snapshot” of the files currently used to run the MX10008 router—the complete contents of the /config and /var directories, which include the running Juniper Networks Junos OS, the active configuration, and the rescue configuration—and copies all of these files into a memory source.

Warning:
The recovery installation process completely overwrites the entire contents of the internal flash storage.
Copy any other stored files to a remote system as desired.

To reinstall Junos OS:

Insert the emergency boot device into the router.
Power cycle the router.

The emergency boot device is detected. At this time, you can load Junos OS from the emergency boot device onto the internal flash storage.
Install Junos OS by choosing one of the following options:
- If you have a snapshot saved on the emergency boot device, the system prompts you with the following option.
```
Junos Snapshot Installer - (c) Juniper Networks 2013           
          Reboot                                                   
          Install Junos Snapshot [14.1X53-D11_vjunos.61]                   
          Boot to host shell [debug]                                                                                                  │
```
  Select Install Junos Snapshot to install the snapshot.
- If Junos OS is installed at the factory on the emergency boot device, the system prompts you with the following option.
```
Juniper Linux Installer - (c) Juniper Networks 2014
            Reboot                                                    
            Install Juniper Linux Platform                           
            Boot to host shell [debug]
```
  Select Install Juniper Linux Platform to install the Junos OS software from the emergency boot device.
The device copies the software from the emergency boot device, occasionally displaying status messages. Copying the software can take up to 12 minutes.
After the software is copied from the emergency device to the device, the device reboots from the internal flash storage on which the software was just installed. When the reboot is complete, the device displays the Junos OS login prompt:
```
root@router#
```
Create a new configuration as you did when the device was shipped from the factory, or restore the previously saved configuration file to the device.
Remove the emergency boot device.

arrow_backward PREVIOUS Removing the MX10008 Router

NEXT arrow_forward Alarm Messages

MX10008 Universal Routing Platform Hardware Guide

ON THIS PAGE

Restoring Junos OS

Creating an Emergency Boot Device

Performing a Recovery Installation Using an Emergency Boot Device

Stay in touch

Helped me install or use the product
Accelerated my deployment

Discuss the product with a co-worker
Make a purchase inquiry