Minimizing Controller Response Time Through Flow Redirecting in SDNs - 2018


Software outlined NetWorking (SDN) is changing into increasingly prevalent for its programmability that enables centralized network configuration and management. With the growth of SDNs, a cluster of controllers cooperatively manages more and additional switches/flows in a very network to avoid the single-controller congestion/failure and improve the management-plane robustness. Underneath the design with multiple controllers, it is expected to reduce the utmost response time on these controllers to supply higher QoS for users. To realize this target, 2 previous methods are mainly used, the static scheme and therefore the dynamic scheme. However, these ways might result in an increase of the control-plane Communication overhead/delay. During this Project, we have a tendency to propose to minimize the most response time on controllers through flow redirecting, which is implemented by putting in wildcard rules on switches. We tend to formulate the minimum controller response time drawback, that takes the flow-table size and link capacity constraints into consideration, as an integer linear program, and prove its NP-Hardness. 2 algorithms with bounded approximation factors are designed to solve this drawback. We have a tendency to implement the proposed methods on our SDN testbed. The testing results and in depth simulation results show that our proposed algorithm can cut back the maximum controller response time by concerning 50p.c-eightyp.c compared with the static/dynamic ways below the same controller value, or scale back the number of controllers by 30percent compared with the dynamic technique while preserving almost the identical controller response time.

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