J-series Services Routers are delivered with JUNOS software with enhanced services preinstalled and SRX-series services gateways are delivered with JUNOS software preinstalled. When you power on the device, it starts (boots) up using its primary boot device. These devices 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.
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 device, or configure a boot device to receive core dumps for troubleshooting.
If the J-series or SRX-series device does not have a 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.