Research On Network Virtualization Model Based On Dynamic Evolution

Network virtualization technology is proposed to deal with the "rigid" problem of the current Internet.With the rise of all kinds of new applications and new technologies,there is a growing demand for customizable networks and network virtualization technology will help solve this problem.As a focus direction of network virtualization technology research,virtual network mapping has made a great development.The virtual network mapping problem refers to the efficient and fast allocation of different virtual network requests to the physical network in the case where the underlying physical network satisfies the conditions such as the node computing capability and the link bandwidth required by the virtual network request.In practice,the virtual network mapping request is constantly changing,while the underlying physical network will also face the situation of failure.In view of these two problems,the main work in this paper has the following three aspects:Firstly.In the virtual mapping model,considering the constant change of the virtual network mapping requests,the evaluation criteria of the income expenditure ratio are added to the performance evaluation model which can assess the impact of virtual network request changes.At the same time,the algorithm is used to evaluate the running efficiency of the algorithm.Secondly.The classical virtual network mapping algorithm is improved,and the change of virtual network request is processed by different priorities.At the same time,the shortest path algorithm is used to obtain the optimal solution.In the process of solving the optimal solution,the minimum change in the income expenditure ratio is found,not the lowest cost.Thirdly.In the dynamic evolution of the virtual network mapping model,automatic repair algorithm is introduced,which automatically fixes the faults that occur in the physical network,when the virtual network requests are constantly changing and underlying physical network is out of order.Simulation experiments show that compared with the original algorithm,the improved algorithm achieves the smaller income expenditure ratio change and reduces therunning time of the algorithm while maintaining the high acceptance rate of the virtual network mapping.The automatic repair algorithm can maintain the high acceptance rate of virtual network mapping and repair most of the physical faults,maintaining the robustness of the virtual network mapping.