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With ever increasing applications emerging into the cloud environment, more advanced requirements have drawn much attention. Cloud data center network is required to be multitenant, low cost, easy-to-operate and easy-to-configure. But existing network architectures still cannot meet all above requirements. In this paper, we explore new challenges of multitenant data center and propose our network solution based on OpenFlow to meet their requirements. The experiment results demonstrate that it is a performance efficient multitenant-ready network solution.