Juniper SYSTEM BASICS - CONFIGURATION GUIDE V 11.1.X Configuration Manual page 541

Use to specify the configuration with which the system is rebooted.
CAUTION: All versions of this command except those using the running-configuration
or startup-configuration keywords erase the current system running configuration.
Before issuing one of those versions, you might want to save the running configuration
to a .cnf file by issuing the copy running-configuration command.
You can require the system to reboot from a configuration file.
To specify an existing system configuration (.cnf) file that the system uses for
the next reboot and all subsequent reboots:
host1(config)#boot config newconffile.cnf
To specify an existing system configuration (.cnf) file that the system uses only
on the next reboot. On subsequent reboots, the system will use the running
configuration current at the time of that reboot:
host1(config)#boot config newconffile.cnf once
You can require the system to reboot from an existing local script (.scr) file that
the system uses only on the next reboot. On subsequent reboots, the system
will use the running configuration current at the time of that reboot:
host1(config)#boot config scriptfile.scr
Configuring this option causes the system to ignore only at the next reboot an
autocfg.scr file that you may also have configured.
If you specify a .cnf file, upon the next reboot the system resets to the factory
defaults; it then opens the .cnf file and begins applying it immediately. If you
specify a .scr file, upon the next reboot the system resets to the factory defaults;
it then waits for a 600-second countdown timer to expire before applying the
script. This period gives the line modules an opportunity to fully initialize before
configuration begins. Upon timer expiration or system initialization (whichever
occurs first), the script executes regardless of the state of the line modules. You
can escape from the countdown by pressing Ctrl+c; the system prompts you to
execute the script immediately or return to the system console.
You can require the system to reboot from the configuration running on the
system at the time of the reboot.
If the system is in Automatic Commit mode:
host1(config)#boot config running-configuration
If the system is in Manual Commit mode:
host1(config)#boot config startup-configuration
See "Saving the Current Configuration" on page 277 in "Managing the System"
on page 251, for information about Automatic and Manual Commit modes.
Chapter 9: Booting the System
Configuring Your System for Booting
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