A J-series Services Router is delivered with the JUNOS Internet software preinstalled. When you power on the router, it starts (boots) up using its primary boot device. All Services Routers also support secondary boot devices allowing 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 in case it becomes corrupted or fails during the upgrade.
On a Services Router you can configure the primary or secondary boot device with a “snapshot” of the current configuration, default factory configuration, or rescue configuration. You can also replicate the configuration for use on another Services Router, or configure a boot 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.
Use either the J-Web interface or the CLI to schedule a reboot or system halt on the router, or to perform one immediately.
This chapter contains the following topics. For more information about installing and upgrading JUNOS software, see the JUNOS Software Installation and Upgrade Guide.