Relay device, relay method and storage medium

A relay method to be performed by a relay device configured to perform relay processing of a frame between a plurality of functional units in an in-vehicle network and including a plurality of communication ports and a memory configured to store correspondence information that is used for the relay processing and indicates a correspondence relationship between a destination media access control address included in the frame and the communication ports, the method comprising:

• monitoring a state of the in-vehicle network;
• switching between a stopped state in which update processing is stopped and an execution state in which the update processing is executed, when a change in the state of the in-vehicle network is detected;
• performing the update processing in the execution state;
• and
• saving, in the memory, the correspondence information on which the update processing is performed in the execution state, as correspondence information to be used for the relay processing in the stopped state, when switching from the execution state to the stopped state.

A storage medium that stores a relay program to be used in a relay device configured to perform relay processing of a frame between a plurality of functional units in an in-vehicle network and including a plurality of communication ports and a memory configured to store correspondence information that is used for the relay processing and indicates a correspondence relationship between a destination media access control address included in the frame and the communication ports, the relay program causing a processor to:

• monitor a state of the in-vehicle network;
• perform update processing of the correspondence information;
• switch between a stopped state in which the update processing is stopped and an execution state in which the update processing is executed, and to switch from the stopped state to the execution state when a change in the state of the in-vehicle network is detected;
• and
• store, in the memory, the correspondence information on which the update processing is performed in the execution state, as the correspondence information to be used for the relay processing in the stopped state, when the processor switches from the execution state to the stopped state.