First relay device, second relay device, and relay system

A second relay device connected to a first relay device so as to be capable of communicating therewith, the second relay device comprising:

• a second memory;
• and
• a second processor coupled to the second memory;
• the second processor being configured to:
• receive a communication frame transmitted from the first relay device and another relay device;
• based on second relay information in which destination address information expressing a destination address of the received communication frame and a relay target bus are associated with each other, and based on destination address information included in the received communication frame, identify the relay target bus associated with the destination address information in the second relay information as a relay target bus of the received communication frame;
• and
• recover the second relay information in a case in which an anomaly notification signal output from the first relay device has been received,
• wherein the second processor is configured to recover the second relay information when the vehicle state is a stationary state, in a case in which a stoppage of the second relay device is needed in order to recover the second relay information.

A relay system comprising a first relay device and a second relay device,

• the first relay device being for installation at a vehicle, and the first relay device comprising:
• a first memory;
• and
• a first processor coupled to the first memory,
• the first processor being configured to:
• receive a communication frame transmitted from another relay device;
• based on first relay information, in which destination address information expressing a destination address of the received communication frame and a relay target bus are associated with each other, and based on destination address information included in the received communication frame, identify the relay target bus associated with the destination address information in the first relay information as a relay target bus of the received communication frame;
• and
• in a case in which the relay target bus of the received communication frame is not identified due to the destination address information of the received communication frame not being included in the destination address information of the first relay information, output an anomaly notification signal indicating an anomaly to the other relay device,
• the second relay device being connected to the first relay device so as to be capable of communicating therewith, and the second relay device comprising:
• a second memory;
• and
• a second processor coupled to the second memory,
• the second processor being configured to:
• receive a communication frame transmitted from the first relay device and another relay device;
• based on second relay information in which destination address information expressing a destination address of the received communication frame and a relay target bus are associated with each other, and based on destination address information included in the received communication frame, identify the relay target bus associated with the destination address information in the second relay information as a relay target bus of the received communication frame;
• and
• recover the second relay information in a case in which the anomaly notification signal output from the first relay device has been received.