This object indicates the stacking port bandwidth. twoPorts - two ports are used for stacking, each port works as a SIO port fourPorts - four ports are used for stacking, each two ports are aggregated together and work as a SIO port. The stacking port bandwidth setting of a switch device must be set before the switch unit can be chained with other switch devices. The setting will be saved on local switch unit if the user saves the configuration. The change of stacking port bandwidth will not take effect until the next reboot.