Reports whether the Link State Database at this level is currently 'overloaded' (short on an essential resource like memory), 'waiting', or normal (off, the default); while waiting or overloaded, this router originates its LSPs at this level with the Overload bit set, signaling to the rest of the network not to route transit traffic through it. An admin forces this into 'waiting' during a planned initialization window via isisSysLevelSetOverload, and watches this object to confirm the overload condition clears once the router has finished converging.