U.S.Patent Apr.9,2019 Sheet 5 of 10 US10,257,802B2 1002 1001 1003 Transmitter Processor Receiver FIG.10 1101 -1102 Processor Receiver FIG.11 1201 An SDN controller receives a first bearer message that is forwarded by a first MAG in multiple MAGs and that carries a first L2 attach request message,so that an MN requests to register with a network 1202 The SDN controller sends,to each of the first MAG and an LMA,a message for establishing a tunnel between the first MAG and the LMA. to establish the tunnel between the first MAG and the LMA 1203 The SDN controller sends,to each of the first MAG and the LMA,a message for adjusting a flow entry of the MN 1204 The SDN controller configures an HNP(s)for the MN,encapsulates the HNP(s)into an RA message,and sends the RA message to the first MAG FIG.12U . S . Patent Apr . 9 , 2019 Sheet 5 of 10 US 10 , 257 , 802 B2 1002 1001 1003 Transmitter Processor Receiver FIG . 10 1101 1102 Processor Receiver FIG . 11 1201 An SDN controller receives a first bearer message that is forwarded by a first MAG in multiple MAGs and that carries a first L2 attach request message , so that an MN requests to register with a network 1202 The SDN controller sends , to each of the first MAG and an LMA , a message for establishing a tunnel between the first MAG and the LMA , to establish the tunnel between the first MAG and the LMA 1203 The SDN controller sends , to each of the first MAG and the LMA , a message for adjusting a flow entry of the MN 1204 The SDN controller configures an HNP ( s ) for the MN , encapsulates the HNP ( s ) into an RA message , and sends the RA message to the first MAG FIG . 12