A relay device includes one or more memories, and one or more processors configured to, based on an amount of traffic regarding each of a plurality of ports included in a plurality of relay devices including the relay device belonging to an MLAG, determine whether a total amount of traffic in the MLAG is no more than a first threshold, in a case where the total amount of traffic in the MLAG is no more than the first threshold, select a first port from among the plurality of ports in accordance with the amount of traffic regarding each of the plurality of ports, and turn off the first port in a case where the first port is included in the relay device.