The value of this object determines the MDI crossover state
of the port. A value of auto(1) enables the port to
automatically detect and activate the appropriate rx/tx
crossover configuration. A value of mdi(3) will force
the port to operate as a crossover port, which is the standard
wiring configuration for a switch port. A value of mdix(2)
will force the port to operate as a straight-through port, with
no internal rx/tx crossover. This object is independent of
and not affected by auto-negotiation setting.