Research And Design Of Cloud Edge Collaboration Optimization For SDN Network Based On OpenFlow

With the continuous growth of the number and types of Internet of things devices,the generated data has reached the size of ZB.The traditional method of data analysis is to load into the centralized cloud data center with strong computing and storage capacity.However,the capacity of cloud computing on processing high real-time application data is insufficient,and loading big data to remote cloud may lead to network congestion.Therefore,the industry proposes to use edge computing as the auxiliary of cloud computing,providing the ability of computing and storing data at the edge of the network to reduce latency and alleviate network congestion.And then SDN is introduced to solve the complex internal interaction and the underlying network congestion problems caused by data migration in cloud edge collaborative system.Based on SDN based cloud edge collaboration architecture,this thesis proposes a time-delay oriented cloud edge collaboration method.Aiming at minimizing the average time delay of the system,the time delay optimization problem is transformed into convex optimization problem by introducing a continuously variable task partition ratio,and finally the optimized task segmentation strategy is obtained.Part of the tasks arriving at the edge node are loaded into the cloud data center,and others are left in the edge server.This thesis also designs the redirection function for cloud edge collaboration based on OpenFlow,and realizes the redirection function based on OpenFlow 1.0,priority based OpenFlow 1.3.5 and pipeline based OpenFlow 1.3.5 respectively,which has the characteristics of wide application range,simple configuration and high efficiency.Open v Switch and Mininet is used to verify the three redirection flow tables designed in this thesis.The results show that the pipeline based OpenFlow 1.3.5redirection flow table has the best performance when the number of flow table entries increases,and the execution time of the redirection packet is much shorter than that of the normal flow table.At the end of this thesis,the verification results of the delay optimized cloud edge cooperation scheme in the network simulation environment are given.The results show that it is consistent with the theoretical calculation,which proves the effectiveness of the proposed cloud edge cooperation method.The results of this thesis can be widely used in the Io T environment based on SDN.