CHAPTER 42
Restoring Junos OS
IN THIS CHAPTER
Creating an Emergency Boot Device for QFX Series Switches | 579
Performing a Recovery Installation | 581
Recovering the Installation Using an Emergency Boot Device | 584
Creating an Emergency Boot Device for QFX Series Switches
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.
Before you begin, you need to the installation media image for your device and Junos OS release from
https://www.juniper.net/customers/support/
.
NOTE:
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:
1. Use FTP to copy the installation media image into the /var/tmp directory on the 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. Use gunzip to unzip the image file.
579
Summary of Contents for QFX3500
Page 1: ...Virtual Chassis Fabric Hardware Documentation Published 2020 11 06...
Page 225: ...Translation The emitted sound pressure is below 70 dB A per EN ISO 7779 201...
Page 229: ...205...
Page 238: ...Unterminated Fiber Optic Cable Warning 214...
Page 246: ...Restricted Access Warning 222...
Page 249: ...225...
Page 257: ...Jewelry Removal Warning 233...
Page 260: ...Operating Temperature Warning 236...
Page 271: ...DC Power Disconnection Warning 247...
Page 275: ...DC Power Wiring Sequence Warning 251...
Page 278: ...DC Power Wiring Terminations Warning 254...
Page 410: ...Figure 130 All QFX5110 VCF g050760 Figure 131 QFX5110 VCF with QFX5100 24Q Leaf Devices 386...
Page 412: ...Figure 132 QFX5100 24Q as a Leaf Device in a QFX5110 VCF 388...
Page 565: ...Table 105 System Information continued Description Field Inventory details 541...