Locating Deteriorated Links by NetworkAssisted Multicast Proving on OpenFlow Networks With the penetration of cloud computing and contents delivery networking, flexible and dynamic traffic engineering in a network connecting globallydistributed datacenters is demanded, which is often centrally managed based on OpenFlow technology. To maintain a high quality of service of the network, detecting and locating deteriorated (e.g., lossy) links is essential. Therefore, in this paper, a framework of actively monitoring both directions of all fullduplex (virtual) links of an OpenFlowbased network is proposed. By designing particular schemes of routing the probe packets along a multicast tree and ordering the statistics collection from selected switches, the proposed framework can promptly locate highly lossy links with a minimized load on both dataplane and controlplane incurred by the measurement. In addition, the proposed schemes are computationallylightweight. Our prototype OpenFlow implementation is tested on Mininet to show its feasibility. The numerical simulation also demonstrates the effectiveness of our proposal.

Real Time Experimentation Study of Software Defined Networking based on Openflow Protocol Internet architecture is under stress by current Internet applications. Internet applications are resource demanding in terms of bandwidth, device configurations, route selection, and troubleshooting. Current Internet does not meet the user need; therefore, the Internet architecture should to be redefined in order to meet the demand of the resourcehungry applications. In this paper, we have analyzed the need of Software Defined Networking (SDN) to restructure the current Internet architecture. In addition, an experimental study of web request and reply based on open flow protocol is conducted to demonstrate the working of open flow protocol between open flow switch and an open flow controller in an SDN topology created in mininet. The analysis of traffic shows the messages exchanged between the open flow entities and the parameters contained in these messages.