Improving energy efficiency in network equipments is becoming an increasingly important research topic. In this paper, we present a design and an evaluation of two power management modes that reduce the energy consumption of OpenFlow switches. First, we define two new low power modes: SLEEP PORT and SLEEP SWITCH, which reduce energy consumption in cases where packets on port or switches are absent. Second, we present a Wake on LAN (WOL) method for OpenFlow Switches to wake up Ethernet ports or the whole switch from inactive states. Finally, we describe our design, experimental results and performance evaluations. Our results show that the control SLEEP PORT mode on a switch might save about 9.8% power consumption per port, and up to about 60% of total power consumption of the switch with SLEEP SWITCH mode.