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With the consideration of the different types of Quality of Service (QoS) metrics such as delay time, Traffic Engineering (TE) that can smooth Internet traffic, and OpenFlow which offers flexible programmability, flow based route setting is becoming more important. With those flow control schemes, routes can be set by defining routes explicitly or by referring to QoS metrics of links. In order to evaluate traffic and application response behavior within a network with those flow control schemes, the authors developed a network simulator on OPNET. They introduce an architectural method that allows extension of an existing simulator to permit measurement of the main function "Flow base route set" and application response.
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