Juniper Networks J-Series manual Performing Software Upgrades and Reboots

Chapter 10

Performing Software Upgrades and Reboots

A J-series Services Router is delivered with the JUNOS software preinstalled. When you power on the router, it starts (boots) up using its primary boot device. All Services Routers support a secondary boot device that allows you to back up your primary boot device and configuration.

As new features and software fixes become available, you must upgrade your software to use them. Before an upgrade, we recommend that you back up your primary boot device.

On a Services Router, you can initialize the primary or secondary boot device with a “snapshot” of the running configuration, default factory configuration, or rescue configuration. You can also replicate the configuration for use on another J-series Services Router, or configure the device to receive core dumps for troubleshooting.

If the router has no secondary boot device configured and the primary boot device becomes corrupted, you can reload the JUNOS recovery software package onto the corrupted compact flash with either a UNIX or Microsoft Windows computer.

This chapter contains the following topics. For more information about installing and upgrading JUNOS software, see the JUNOS Software Installation and Upgrade Guide.

■Upgrade and Downgrade Overview on page 179

■Before You Begin on page 181

■Downloading Software Upgrades from Juniper Networks on page 181

■Installing Software Upgrades with the J-Web Interface on page 182

■Installing Software Upgrades with the CLI on page 184

■Downgrading the Software on page 185

■Configuring Boot Devices on page 186

■Recovering Primary Boot Devices on page 191

■Rebooting or Halting a Services Router on page 194

Upgrade and Downgrade Overview

Typically, you upgrade the JUNOS software on a Services Router by downloading a software image to your router from another system on your local network. Using the

Upgrade and Downgrade Overview ■ 179