Routing Technology Based On SDN Virtual Network

The network size is growing, and the business is constantly expanding at present,thus resulting in that the traditional network architecture and technology have been unable to meet the on-demand transfer?rapid configuration and other requirements, then,SDN is put forward to deal with this situation. SDN is an innovative network architecture,in order to make the management more flexible, it's forwarding plane and control plane are independent of each other. What's more,it has an excellent feature of good programming. In addition, virtualization of network resources can also solve this problem to a large extent, the users' multiple virtual networks can exist on the underlying physical network, they will be mapped into the underlying physical network based on different mapping algorithms and these virtual networks can share the underlying network resources.SDN is now as new network architecture, and the network virtualization is considered as an important area of future network research, the combination of the two technologies is of great significance. It appears that the most suitable area for SDN should be the application of network virtualization in the data center. In the process of network virtualization, the unavoidable technologies are the mapping algorithm and load balancing research. The mapping algorithm mainly considers the virtual network nodes and links mapping to the underlying physical network nodes and links, thus finding the appropriate underlying physical network to meet the conditions of virtual networks and find the excellent routing path. On the other hand, the load balancing can guarantee the efficient utilization of the underlying physical network resources.This thesis researches on the SDN virtual network routing technology as an import research direction, and combined with the actual project. The main study of the content are as follows:Firstly, the SDN virtual network technology is researched, and then the author discusses the environment of SDN network virtualization. Furthermore, the different mapping algorithms of virtual network mapped to the underlying physical network are discussed.Secondly, in the processes of virtual network mapping to the underlying physical network, taking into account the mapping of nodes and links and also the design methods of the routing algorithm. In the design of the routing algorithm, the author will set up two scenarios: unconstrained routing searching and constrained routing searching.In the case of unconstrained routing, the algorithm is combined with existing algorithms and designed to achieve the minimum cost and the shortest path pair, and the possible shortest K paths. Under the condition that the constraint is necessary nodes, the algorithm is designed to find the shortest path and the minimum cost path pair, then, the author analyses the differences between new algorithms designed in this paper and the existing algorithms.Finally, in the mapping process, in order to get the optimal routing paths, the author mainly consider the number of hops and costs, but in the actual network environment, it is necessary that the problem of load balancing must be considered.Therefore the author has designed different plans to solve this problem which is based on virtual network nodes and links.