Network topology When defining the topology, the interface person of each controller is responsible for sorting out the function list, and then the same domain will organize a meeting to discuss the optimization of function allocation, network connection, etc., for example: upgrade ECU to connect one or more connections. The network supports higher baud rate on the network; the function of the controller in the secondary network is moved to the domain controller to support the realization of more advanced functions; at the same time, there will also be meetings between different domains to discuss the optimization of function allocation to see if it is necessary to Functions are moved to other domains.