U.S.Patent Apr.9,2019 Sheet 6 of 10 US10,257,802B2 An SDN controller receives a first bearer message that -1301 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 1302 1303 The SDN controller sends a first The SDN controller sends a second establishment message to the first MAG establishment message to an LMA 1304 1305 The SDN controller sends a first The SDN controller sends a sccond adjustment message to the first MAG adjustment message to the LMA The SDN controller configures an HNP(s)for the MN,encapsulates the 1306 HNP(s)into an RA message,and sends the RA message to the first MAG When the MN needs to be switched from the first MAG to a second MAG in the multiple MAGs,the SDN controller receives a second bearer 1307 message that is forwarded by the second MAG and that carries a second L2 attach request message,to request the MN to register with the network The SDN controller sends,to each of the second MAG and the LMA.a 1308 message for establishing a tunnel between the second MAG and the LMA to establish the tunnel between the second MAG and the LMA The SDN controller sends,to each of the second MAG and the LMA,a 1309 message for adjusting a flow entry of the MN The SDN controller configures the HNP(s)for the MN,encapsulates the HNP(s)into the RA message,and sends the RA message to the second -1310 MAG,so that the MN is registered with the network when the MN receives the RA message from the second MAG FIG.13U . S . Patent Apr . 9 , 2019 Sheet 6 of 10 US 10 , 257 , 802 B2 1301 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 1302 1303 The SDN controller sends a first establishment message to the first MAG The SDN controller sends a second establishment message to an LMA 1304 - 1305 The SDN controller sends a first adjustment message to the first MAG The SDN controller sends a second adjustment message to the LMA 1306 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 - 1307 When the MN needs to be switched from the first MAG to a second MAG in the multiple MAGs , the SDN controller receives a second bearer message that is forwarded by the second MAG and that carries a second L2 attach request message , to request the MN to register with the network The SDN controller sends , to each of the second MAG and the LMA , a 1308 message for establishing a tunnel between the second MAG and the LMA , to establish the tunnel between the second MAG and the LMA 1309 The SDN controller sends , to each of the second MAG and the LMA , a message for adjusting a flow entry of the MN 1310 The SDN controller configures the HNP ( s ) for the MN , encapsulates the HNP ( s ) into the RA message , and sends the RA message to the second MAG , so that the MN is registered with the network when the MN receives the RA message from the second MAG FIG . 13