This application discloses a communication method, apparatus, device, and system, and a computer-readable storage medium, and relates to the field of communication technologies. The method includes: A CP device receives a first packet that is sent by a first UP device and that carries source information of a first user terminal; searches, based on the source information of the first user terminal, a correspondence between source information of a user terminal and a location identifier of the user terminal accessing a network, to determine a first location identifier of the first user terminal accessing a network; and sends the first location identifier to a USF device, so that the USF device can determine that the first user terminal accesses the network from a first physical port on a first SF device, and configure a second SF device by using a controller, to switch traffic from the first user terminal from a first sub-interface that is on the first SF device and that corresponds to the first UP device to a second sub-interface that is on the second SF device and that corresponds to a second UP device, thereby sending traffic of a static user to an appropriate UP device.