Research On Fault Detection And Recovery Technology Based On SDWN Architecture

With the rapid development of the mobile Internet,more and more users are accustomed to accessing the network through the wireless LAN,and the rapidly growing network scale also puts higher requirements on the wireless LAN itself.In recent years,Software Defined Wireless Network(SDWN)formed by the combination of Software Defined Network(SDN)and Wireless Local Area Network(WLAN)has received extensive attention from researchers.Compared with traditional networks,the SDWN architecture has excellent features such as separation of control and forwarding planes,centralized management,and the ability to respond more flexibly to the ever-increasing demands in the network.Therefore,in this framework,researchers have carried out research and achieved certain results,such as load balancing,access management and other fields.The stability of the network system provides a basic guarantee for the users on the network to obtain services,and the recovery speed after a network failure is an important criterion for evaluating the stability of the network system.Therefore,it is also necessary to study the fault detection and recovery technologies in SDWN architecture.Based on this requirement,this thesis first expands the current SDWN architecture and proposes an Extended Information SDWN(Ei-SDWN),which enhances the ability to collect information and exchange information in the network,and it help the study of this article.Based on the Ei-SDWN architecture,this thesis designs a fault detection and recovery model based on the Data-Plane-led Fast Recovery(DPFR).The main idea of this model is that when a data plane device discovers a network failure and reports the failure to the control plane,the data plane device immediately and autonomously attempts to recover from the failure,to restore the network communication as quickly as possible,and to reduce the failure to the user.After confirming the fault on the control plane and recalculating the path,the control plane resumes rerouting to balance the network load and reduce the network-induced fluctuations.Based on this model,this thesis classifies the possible faults in the Ei-SDWN architecture into two types: wired side faults and wireless side faults,and specifically describes how these two types of faults are detected in the model,DPFR fast recovery,and rerouting recovery.Finally,this article uses ONOS,OpenvSwitch and other open source software to achieve the above fault detection and recovery model,and use the mininet to build a test topology.Through the functional verification of the model in the test environment,the results show that both the faults on the wired side and the wireless side,the fault detection and recovery model with DPFR as the core can automatically complete the fault recovery and control by the data plane.The plane further balances the load of the network and improves the overall user service experience.