A current measurement circuit for measuring a current is provided. The connection port is connected to an external Ethernet port. The sleeve is adapted to contact a mounting hub. In second aspect, the enhanced spanning tree engine rapidly transitions certain ports to a forwarding state to prevent associated applications from timing out and shutting down. In a later manufacturing stage, the implantation blocking portion may be removed to reduce the gate electrode height to a desired level in order to enhance the process conditions during the deposition of an interlayer dielectric material, thereby significantly reducing the risk of creating irregularities, such as voids, in the interlayer dielectric material, even in densely packed device regions. According to the invention, all switches connected with the same VLAN are allowed to share an inherent ID of each switch, a port ID connecting the switches and information about a bandwidth so as to calculate an optimized path that each switch is connected to other switches.