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.