Onboard relay apparatus, relay method, and computer program

An onboard relay apparatus on an extension side capable of executing relay processing of a communication frame, the onboard relay apparatus comprising:

• a first memory configured to store original data of a plurality of relay tables usable for the relay processing;
• a second memory configured to store one relay table extracted from the original data;
• a first communication unit that includes a plurality of communication ports, and is configured to transmit and receive a first frame that complies with a first communication protocol, using each of the plurality of communication ports;
• a second communication unit configured to transmit and receive a second frame that complies with a second communication protocol;
• and
• a control unit configured to execute the relay processing related to the first frame and the second frame,
• wherein the control unit executes update processing for updating the relay table that is extracted from the original data of the first memory to the second memory if identification information of an extension device connected to the communication port is identification information included in an extension target range allocated in advance.

A relay method that is executed by an onboard relay apparatus on an extension side capable of executing relay processing of a communication frame,

• the onboard relay apparatus including:
• a first memory configured to store original data of a plurality of relay tables usable for the relay processing, and
• a second memory configured to store one relay table extracted from the original data,
• the relay method comprising:
• a step of transmitting and receiving a first frame that complies with a first communication protocol, using at least one of a plurality of communication ports;
• a step of transmitting and receiving a second frame that complies with a second communication protocol;
• a step of executing the relay processing related to the first frame and the second frame;
• and
• a step of executing update processing for updating the relay table that is extracted from the original data of the first memory to the second memory if identification information of an extension device connected to the communication port is identification information included in an extension target range allocated in advance.

A computer program for causing a computer to function as an onboard relay apparatus on an extension side capable of executing relay processing of a communication frame,

• the computer program causing the computer to function as:
• a first memory configured to store original data of a plurality of relay tables usable for the relay processing,
• a second memory configured to store one relay table extracted from the original data,
• a first communication unit that includes a plurality of communication ports, and is configured to transmit and receive a first frame that complies with a first communication protocol, using each of the plurality of communication ports,
• a second communication unit configured to transmit and receive a second frame that complies with a second communication protocol, and
• a control unit configured to execute the relay processing related to the first frame and the second frame,
• wherein the control unit executes update processing for updating the relay table that is extracted from the original data of the first memory to the second memory if identification information of an extension device connected to the communication port is identification information included in an extension target range allocated in advance.