Research And Development Of The Key Technologies For SDWAN Control Function Sinking

With the rapid development of the Internet industry,various Internet services appear in large numbers.Network solutions based on traditional IP routing can not meet the increasing business diversity and the constantly-improving user demand.SDWAN technology emerges at the right moment.In recent years,there are more and more SDWAN solutions,but most of them are centralized control under the scenes where the network conditions are relatively stable.The existing SDWAN solutions do not meet the demand of the Internet.Based on the original project POCO of the laboratory,a WAN-based control agent PMAO with distributed deployment is proposed.The PMAO deployed in network dispersedly,directly controls the local forwarding node.The Overlay network is used to transmit the data stream,and some key control strategies are pre-issued by the centralized controller PMSO.The control functions with higher timeliness requirements are lowered into the PMAO with distributed agent,which changes into the distributed control of the centralized control to improve the control efficiency.This paper conducts the background survey at first.The SDWAN solution under the production environment is surveyed,this paper compare it with the research scenarios in this paper,and summarize the differences and reference values.And the working principle and function of distributed control agent PMAO are introduced.On the basis of the background survey,the paper analyzes the problems existing the PMAO.The whole Overlay network data surface is packed by utilizing the MPLS label by virtue of the Segment Routing technology.The flow scheduling function lowering to the agent is improved so that the control function after lowering could fit the MPLS data plane.This paper also proposes the rapid switching technology of network fault for the application of QoS indicator,lowers the control function guaranteeing the application of QoS indicator to the distributed control agent to guarantee the rapid switching of fault.The problems in the PMAO program are analyzed,and a new version of PMAO is designed and implemented.The new version PMAO follows the principles of simplicity,openness and extensibility.Finally,on the cloud host network deployed in the world,the function and performance of the new version of PMAO were tested,and the correctness and efficiency of the system were verified.