Research On Virtual Network Construction

Network virtualization technology breaks down the closed architecture of the network by isolating the underlying complex physical network devices,decouples the hardware and software of the traditional network devices,speeds up the deployment of new services,improves network management and maintenance efficiency,enhances system flexibility and becomes one of the core technology supporting the future network framework."On-Demand Networking" has become a business entry point for mainstream network service providers.The on-demand network includes four typical application scenarios:cloud network collaboration,smart campus,intelligent Internet of Things,and multi-point interconnection of enterprises.It provides flexible,dynamic and convenient intelligent network services.However,there is plenty of optimized room for on-demand networks,including end-to-end resource allocation and network resource utilization.Internet of Things(IoT)technology in on-demand network applications,get the environmental changes and intelligently control netwroks by deploying large-scale nodes in environmental regions.In spite of this,there are many technical challenges to be solved in smart IoT.For example,a recurring problem in IoT technology-how to quickly build a heterogeneous network topology.This paper based on the network science theory,focuses on the methods of network topology construction and resource allocation,proposes the virtual network link addition algorithm and dynamic network bandwidth allocation algorithm,and conducts the experimental verification and analysis the results,the main research work and innovative points are as follows:(1)Aiming at the problem of large computational workload in network topology construction,this paper proposes a link-adding algorithm with low time complexity based on the small-world model.This algorithm uses the instability node forming and constituting theorems to update the shortest distance value of all node pairs in the network,reducing the time complexity of the algorithm and supporting dynamic link addition calculation.For SDN layer-2 layer network in Internet2 and heterogeneous sensor networks in the Internet of Things,the algorithm optimizes the link adding mechanism of the switch topology and the sensor topology and improves the related network capabilities.The simulation results show that the algorithm reduces the average path length of the network topology,increases the average cluster parameter value of the network nodes,and reduces the average transmission delay from end to end of the network,so that the virtual network construction technology can be more efficient and fast support low time extension of user business in the future.(2)Aiming at the high standard of network bandwidth allocation,a dynamic bandwidth allocation algorithm is proposed.The algorithm optimizes the real-time user request scheduling model,analyzes the historical bandwidth allocation data and the real-time physical network bandwidth data,and matches with the user bandwidth requests,adds a pre-path allocation mechanism for bandwidth management,realizes the real-time bandwidth allocation of the global network flexible management.The simulation results show that the proposed algorithm can effectively improve the link utilization of the network and improve the user request satisfaction rate,which can be applied to the virtual network construction.(3)Experimental verification and analysis based on software-defined network planning platform combined with the network simulation software Mininet and Opendaylight controller.The experimental results show that the virtual network link adding algorithm reduces the average path length of the network topology and reduces the average transmission delay from end to end of the network.At the same time,the dynamic bandwidth allocation algorithm is embedded into the SFC module of Opendaylight controller.The experimental results show that the dynamic bandwidth allocation algorithm can allocate the bandwidth according to the real-time bandwidth data of the physical network and the user bandwidth request to meet the user's request.