This mib object contains the following values,
which has the meaning as:
'shutdown' - An Uni-Direction link has been
detected and the port has been
disabled.
'indeterminant' - Uni-Direction Link Detection
protocol has not collected enough
information to determine if the
link is bi directional or not.
'biDirectional' - A bi directional link has been
detected.
'notApplicable' - Uni-Direction Link Detection
Protocol is disabled.