MIB: IF-MIB
The current operational state of the interface.
- The `testing(3)` state indicates that no operational packet scan can be passed.
- If `ifAdminStatus` is `down(2)`, then `ifOperStatus` should be `down(2)`.
- If `ifAdminStatus` is changed to `up(1)`, then `ifOperStatus` should change to `up(1)` if the interface is ready to transmit and receive network traffic.
- It should change to `dormant(5)` if the interface is waiting for external actions (such as a serial line waiting for an incoming connection).
- It should remain in the `down(2)` state if and only if there is a fault that prevents it from going to the `up(1)` state.
- It should remain in the `notPresent(6)` state if the interface has missing (typically, hardware) components.