Test And Optimization Of Service Chain Based On SDN/NFV

With the rapid development of Internet technology,network resource deployment has become more and more complex,and the management of network traffic has become more and more difficult.With the development of the Software Defined Network(SDN)architecture,the SDN separated the control plane from the forwarding plane.The underlying network device has been only responsible for data forwarding,and the forwarding mode and logic of service has been completed by the controller,which greatly simplified management of network and reduced the cost.The rising Network Function Virtualization(NFV)technology virtualized physical devices into logical devices,which decouples software and hardware,making resources fully and flexibly shared.to improve the utilization of network devices and the flexibility of network operations.The service chain based on SDN and NFV technology is a flexible service chain for tenants.Users can change the path of network traffic according to their own needs without changing the underlying physical network topology.VNF resources can be flexibly embedded to the underlying physical network to implement flexible management of network resources and application traffic.Based on a company's SDN service chain system,this paper verifies and analyzes the workflow of the SDN service chain through testing,and optimized the deployment of the SDN service chain system for the shortage of service chain deployment.The specific research contents are as follows:Based on a company's service chain system of SDN,the implementation details of the service chain system are studied.Combining the east-west and north-south service chain traffic models,the workflow of the service chain system is tested from the aspects of service chain forwarding rules,flow classification rules,and service chain forwarding processes.When the network traffic matches multiple service chains,focus on the flow classification rules and analyze the matching principle of the service chain.Based on the shortcomings of deployment scheme in service chain system,the service chain dynamic deployment scheme is designed to optimize the deployment mode of the service chain.Which avoid resource idle.Based on the deficiencies of the two-step embedding scheme,this paper proposes a one-step embedding scheme,which takes the path delay of service chain mapping as the optimization goal and constructs the service chain embedding.The model solved the service chain embedding problem step by step through the graph algorithm.It includes a node embedding preprocessing scheme based on nodetopology potential,a link embedding preprocessing scheme based on a shortest path spanning tree,and a dynamic programming algorithm for multi-segment graph.Finally,the minimum delay path of the service chain embedding under the scheme is obtained.