This object indicates the stack mode that user configed for
this unit. The object only can be configed when the device is
stand alone.
other(1) - this entry is currently in use but the conditions
under which it will remain so are different from each of the
following values.
auto(2) - the system will auto assign this stack role of this
unit to be stand-alone(3), master(4), or slave(5).
stand-alone(3) - the unit is forced to stand alone.
master(4) - the unit is forced to master. If this unit is
seleted to be master, it can modify the configuration of the
stacking system.
slave(5) - the unit is forced to slave. If this unit is
seleted to be slave, it only can view the configuration of
the stacking system.