关键词: 网络虚拟化, 虚拟网络重配置, 跷跷板现象

Abstract:

A virtual network reconfiguration(VNR) algorithms based on the minimum cost is proposed. In the method,achieve the reconfiguration mechanism, the parameter—the degree of improvement during the reconfiguration—is defined to judge the effect of network reconfiguration mechanisms, then the target physical nodes are selected on the constraint of the minimum cost, after then, the virtual node will be migrated to the target physical node, and then virtual links will be mapped to the physical path using the shortest path algorithm to calculate. This method will avoid the phenomenon called "seesaw" that the target physical node becomes the new bottleneck node. The reason of the phenomenon is that virtual node is migrated from one physical node leading to bottleneck to others during the VNR. The results of simulation verifies the feasibility of this method.

Key words: network virtualization, virtual network reconfiguration, seesaw phenomenon