This attribute describes the operational state of the Link Control
protocol. If the interface to the physical link hardware is inactive, the
linkOperState is in the down state.
The polling state only occurs when the Local Management Interface
(LMI) is enabled and the physical link is active. The polling state
indicates LMI is polling for its peer. Once communication is established
the linkOperState will transition to the active state.
If the procedure attribute of the Lmi component is set to none,
linkOperState will transition to the active state once the physical link
becomes active.