Despite the development of virtualization technologies in computing resources, how best to build virtual networks is still an open issue. Virtual network is an important technology that can hide physical network topologies and policies and provide a dedicated virtual computing environment for each user. However, it is difficult to figure out the actual mapping between a physical network and a virtual network from a logical point of view; the difficulty will cause performance degradation in the virtual network and inefficient network routing. We have therefore proposed a network performance-aware routing mechanism using SDN technologies. By using SDN technology, we can control the network in a centralized manner. Our proposed system automatically aggregates the information on network performance, and then defines an appropriate routing policy by solving optimal path problems based on the observed network performance. We have improved the performance of the inter-domain network for a multisite virtual cluster with the proposed system. We have also started to deploy the proposed system into an actual environment consisting of different multiple organizations.
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