Configuring Your System for Booting

Juniper Networks delivers your E-series router already set up with a factory default configuration and a software release (.rel) file. You can, however, create a new configuration file (.cnf) and select a different software release file to use in future reboots of your router. When you reboot your router, you can use:

• An existing configuration file to be used each time the system reboots
• An existing configuration file limited to a single reboot
• An existing script file to be used on only the next reboot
• An existing script file to be used on the next and every subsequent reboot using backup mode
• The configuration that is already running on the system
• The factory default configuration

In addition, you can configure the system to load a different software release file on its next reboot. Use the boot system command to do this. If you do not configure your system with a backup release, it reverts to the release and configuration it had before the crash.

You can use the boot backup command to specify a software release and configuration for the system to use in case the system resets too many times in a given period.

The boot subsystem command enables you to override the system release setting for a given subsystem—for example, OC3.

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