A method of configuring an in-vehicle network includes: receiving a first wake-up signal from a first controller among a plurality of controllers in a sleep mode by an Ethernet switch; activating the Ethernet switch according to the wake-up signal; determining a routing port according to a destination address of the Ethernet data received from the first controller; and transmitting a second wake-up signal of a second controller among the plurality of controllers through a physical-layer processing device included in the Ethernet switch corresponding to the determined routing port.