01533nas a2200145   4500000000100000000000100001008004100002260004800043100001600091700001700107245009500124300001200219520113400231022002201365       2016                            d  bIEEEaImperial Coll Campus, London, England1 aF. Francois1 aErol Gelenbe00aOptimizing Secure SDN-Enabled Inter-Data Centre Overlay Networks through Cognitive Routing  a283-2883 a<p>More and more businesses are deploying their application(s) with different cloud providers which are close to their customers in order to provide better Quality of Service (QoS) to their end customers. In this work, an optimized and secure software-defined overlay network is proposed as an efficient mechanism to interconnect these geographically-dispersed applications compared to using only plain IP routing. A logically centralized Cognitive Routing Engine (CRE), based on Random Neural Networks with Reinforcement Learning, was developed to find with minimal monitoring overhead the optimal overlay paths when the public Internet is used as the communication means between the overlay nodes. CRE was evaluated by using an overlay network composed of hosts from 5 different public clouds where it was shown that the latency of CRE paths is most of the time within 5% of the latency of the optimal IP paths. Furthermore, it was also demonstrated that CRE is able to do asymmetric path optimization where the forward path is different from the reverse path for a given data centre pair in order to further improve QoS.</p>
  a978-1-5090-3432-1