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Road vehicles are equipped with a rising number of driver assistance systems resulting in increasing bandwidth demand and need for reconfiguration that are difficult to satisfy with traditional in-vehicle networks. As a result, automotive Ethernet networks become more common. With rising complexity of in-vehicle networks, new requirements emerge and call for more flexible automotive network architectures. In this work, we give examples of how Ethernet-based automotive network architectures can profit from software-defined networking (SDN) and present an SDN-based architecture that allows to reconfigure the network dynamically.