Vehicle having an ethernet bus system and method for operating such a bus system

A method of operating an Ethernet bus system in a vehicle, wherein at least one distributor device communicates with multiple bus participants that are connected to respective port connections of the distributor device and, by way of a respectively assigned port connection transmit data to the distributor device and/or receive data from the distributor device during operation of the Ethernet bus system, wherein the method comprises the acts of:

• during the operation of the Ethernet bus system, diagnosing, via the at least one distributor device, at least one of the port connections;
• based on the diagnosing, providing diagnostic data concerning the at least one port connection to a central evaluation device that is integrated in the distributor device;
• evaluating the diagnostic data by the central evaluation device that is integrated in the distributor device;
• and
• storing the diagnostic data by the central evaluation device that is integrated in the distributor device in a central diagnostic memory, wherein the stored diagnostic data is accessible by way of an interface of the distributor device;
• wherein no external diagnostic device is connected to the distributor device.