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
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