The port's current state in the corresponding Spanning
Tree instance as defined by application of the Multiple
Spanning Tree Protocol. This state controls what action
a port takes on reception of a frame. If the bridge has
detected a port that is malfunctioning it will place that
port into the broken(6) state. For ports which are
administratively disabled (see dot1dStpPortEnable), this
object will have a value of disabled(1).