Wireless local area network tunnel establishing method, apparatus and access network system

The invention provides a wireless local area network (WLAN) tunnel establishing method, apparatus and access network system. An access controller (AC) sends a first configuration message to an access point (AP), wherein the first configuration message includes first tunnel establishment configuration parameters which include binding information between the IP of at least one broadband remote access server (BRAS) and at least one service set identifier (SSID), so that the AP establishes a data tunnel with the BRAS according to the first tunnel establishment configuration parameters; meanwhile the AC and the AP establish a control tunnel, thereby separating the data tunnel from the control tunnel, and reducing unnecessary cost of the AC.