Abstract
Cloud computing is becoming the real world tendency of IT model that offers flexible and on-demand service, most of which adopt Software-Defined Networking (SDN) as their network architecture to simplify network management and ensure network isolation. While there seems integration for cloud and SDN providing a more robust and secure IT services, the new challenges also occur with the marriage of the two technologies. This paper studies the control logic inconsistency problem in typical cloud network architecture (SDN) and presents a solution, called sSDN (strengthen SDN in cloud), a feasible solution for this problem. In this method, the timing sequence of the control rules is tuned adaptively on the control plane so as to guarantee that the control logic in the whole network is consistent. In addition, an objective optimization model based on the average network latency of nodes is constructed. With this objective optimization model, we find the minimum-delay route while retaining the logic consistency in the SDN network, which can provide a stable network environment in cloud for individuals and enterprises.