Embodiments of the present invention provide an access network system, and a data packet processing method and apparatus. The system includes: a controller, configured to perform configuration a flow table for a switching module and a protocol function for at least one functional module; the switching module, configured to send a first data packet to a first functional module of the at least one functional module according to the flow table configured by the controller, where the first functional module is a functional module first indicated in the flow table to process the first data packet; and the at least one functional module, configured to process the first data packet according to the protocol function configured by the controller.