The value of alcatelIND1IsisSpbSysOverloadTimeout is the amount of time, in seconds, the router operates in the overload state before attempting to reestablish normal operations. While in overload state, this IS-IS router will only be used if the destination is only reachable via this router; it is not used for other transit traffic. Operationally placing the router into the overload state is often used as a precursor to shutting down the IS-IS protocol operation. The value of 0 means the router is in overload infinitely.