Indicates whether the particular virtual cir- cuit is operational. In the absence of a Data Link Connection Management Interface, virtual circuit entries (rows) may be created by set- ting virtual circuit state to active, or delet- ed by changing Circuit state to deleted. Whether or not the row actually disappears is let to the implementation, so this object may actually read as 'invalid' for some arbitrary length of time. It is also legal to set the state of a virtual circuit to inactive to tem- porarily disable a given circuit.