Vehicle-mounted relay device, relay method, and computer program

A relay method executed by an in-vehicle relay device that is capable of executing a relay process for communication frames and includes a storage unit configured to store a plurality of relay tables required for the relay process, the method comprising:

• transmitting and receiving a first frame conforming to a first communication protocol in at least one of a plurality of communication ports;
• transmitting and receiving a second frame conforming to a second communication protocol;
• executing the relay process regarding the first frame and the second frame;
• receiving a control frame from an external device, the control frame being the second frame that includes identification information of an extension device that communicates using the first frame;
• and
• executing a selection process of selecting one relay table from among the plurality of relay tables stored in the storage unit, based on the identification information of the extension device included in the received control frame.

A non-transitory computer readable storage medium storing a computer program for causing a computer to function as an in-vehicle relay device capable of executing a relay process for communication frames,

• the computer program causing the computer to function as:
• a storage unit configured to store a plurality of relay tables required for the relay process;
• a first communication unit having a plurality of communication ports, and configured to transmit and receive a first frame conforming to a first communication protocol in each of the plurality of communication ports;
• a second communication unit configured to transmit and receive a second frame conforming to a second communication protocol;
• and
• a control unit configured to execute the relay process regarding the first frame and the second frame, wherein
• the control unit executes
• an identification information acquisition process of receiving a control frame from an external device, the control frame being the second frame that includes identification information of an extension device that communicates using the first frame, and
• a selection process of selecting one relay table from among the plurality of relay tables stored in the storage unit, based on the identification information of the extension device included in the received control frame.