This read-write TruthValue lets an admin administratively set the IS-IS overload bit for both routing levels, telling neighbors this router should be avoided for transit traffic even though it is not actually resource-constrained. It matters operationally because the router will keep the overload bit set independent of this setting if it genuinely runs out of memory, so this object is purely an admin-controlled override on top of that automatic behavior. For example, an engineer preparing to reboot a core router might set this to true first so IS-IS reroutes transit traffic around it before the disruptive maintenance begins.