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Hierarchy Level


Configure which Junos OS processes are running on the router or switch.


Never disable any of the software processes unless instructed to do so by a customer support engineer.


All processes are enabled by default.


(enable | disable)

(Optional) Enable or disable a specified process.

failover (alternate-media | other-routing-engine)

(Optional) For routers or switches with redundant Routing Engines only, switch to backup media if a process fails repeatedly. If a process fails four times within 30 seconds, the router or switch reboots from the alternate media or the other Routing Engine.


One of the valid process names. You can obtain a complete list of process names by using the CLI command completion feature. After specifying a process name, command completion also indicates any additional options for that process.

timeout seconds

(Optional) How often the system checks the watchdog timer, in seconds. If the watchdog timer has not been checked in the specified number of seconds, the system reloads. If you set the time value too low, it is possible for the system to reboot immediately after it loads.

  • Values: 15, 60, or 180

  • Default: 180 seconds (rounded up to 291 seconds by the Junos kernel)

Required Privilege Level

system—To view this statement in the configuration.

system-control—To add this statement to the configuration.

Release Information

Statement introduced before Junos OS Release 7.4.