Research On SDN-based Optical Network Virtualization

With the rapid development of the information society,the amount of social business information is increasing,and the network's structure is getting more complicated.At the same time,big data,cloud computing and virtual network processing technology are unceasingly evoluted,people ask for higher quality of network service,higher efficiency and higher stability of the transmission of network information.Optical network virtualization technology based on SDN(Software-Defined Network)emerges,which makes all the physical devices in the network be abstracted.The virtual optical source can be stored in the pool of resources,so that network users can dynamically schedule and control network resource,which ensures the flexibility and controllability of the transmission of optical network resources,and improves the efficiency of data transmission.In view of the low utilization rate of some links' bandwidth and some links' overloading in the transmission process of traditional optical network data,this paper analyzes four commonly used routing algorithms,and proposes a multi-path optimization routing allocation algorithm based on these algorithms.For the hose model,it uses linear programming to minimize the maximum load rate of the network link,optimizes the network link load and reduces the traffic transmission delay.By comparing with other schemes,it is concluded that the optimized routing algorithm proposed in this thesis takes full account of the real-time bandwidth limitation and congestion in the transmission process of network,reduces the maximum load of the network and apparently decreases the traffic transmission delay.At the same time,this paper uses simulation tools such as ONOS and Mininet to verify and simulate the optimization routing algorithm.Then this paper constructs the topological structure of packet network layer and optical layer based on SDN controller's theory,and makes the virtual packet network mapped to the optical network,respectively establishes the simple circle structure and complex network structure.Optimization routing algorithm is applied to these two structures and compared with the multi-path sharing routing algorithm.The simulation results show that the optimized routing algorithm proposed in this paper,both in the simple network structure and complex network structure,can effectively reduce the delay in the transmission process of data,avoid network congestion and improve the stability and efficiency of data transmission.