This read-write Unsigned32, in seconds (5 to 86400), configures the router to automatically set the IS-IS overload bit for a defined period after IS-IS comes up at startup, clearing it once that time elapses unless the router is still out of memory. Admins use it to keep a newly-booted router out of the transit path until its routing tables and adjacencies have stabilized, avoiding routing loops or blackholes during convergence. For example, setting this to 600 keeps the overload bit up for 10 minutes after startup, and setting it to zero removes the startup-overload configuration entirely.