A Design For Fusion SD-WAN Wide Area Network Access And Its Acceleration Technology

This thesis proposes a fusion SD-WAN architecture for the lack of flexibility of the existing SD-WAN(Software Defined Wide Area Networking)architecture.The architecture uses the RYU controller as the core of the entire SD-WAN and deploys it at the corporate headquarters.Unlike other SD-WAN solutions,the forwarding layer of the SD-WAN architecture is combined with CPE(Customer Premise Equipment)and The OpenFlow switch is the main device and performs functions such as forwarding and receiving data.In the fusion SD-WAN architecture,the RYU of the control layer completes the information interaction with the forwarding layer through the southbound OpenFlow protocol,and the control layer completes the control functions of the entire network,including the acquisition of real-time state information of the network,the creation of the logical network,and the forwarding of the data flow which based on the segment routing.Based on the fusion SD-WAN software architecture,a WAN transmission acceleration mechanism is designed and implemented,and an improved algorithm(FBM)for wide area network acceleration is proposed for this mechanism.This mechanism completes the compression processing of key data streams and non-critical data streams by embedding the WAN acceleration module at the CPE equipment,and compares it with the traditional WAN acceleration method.The results show that the proposed FBM algorithm and data stream forwarding The strategy can not only effectively guarantee the accelerated transmission of key data streams,but also reduce the link utilization of the WAN and prevent congestion.