A method includes sending, by a serving node, instruction information to an anchor node, where the instruction information is used to instruct to establish a first interface between the serving node and the anchor node; and receiving, by the serving node, response information from the anchor node in response to the first instruction information, wherein the radio resource control message carried in a signaling radio bearer 1 (SRB1) of the terminal is served by the anchor node, and the radio resource control message carried in a signaling radio bearer 0 (SRB0) of the terminal is served by the serving node.