Abstract:This paper analyzes the existing problems of the data center in universities nowadays and a highly reliable and secure data center design of large layer2 network is proposed by use of technology of SDN, VXLAN and virtualization. This said system, by the combined use of virtualized storage and FCSAN storage, has successfully made the centralized storage a re- ality, and effectively reduces the cost for storage, operation and maintenance. The division of the safe region by the use of core multi-service switch board card and SDN,can help achieve inter-region and inner-region safety protection of the data center.