Performance Modelling Considering Retransmission and Verification for a Software Defined Network

• Main Authors: Duh, Hsiao-Han, 杜筱菡
• Other Authors: 柯開維
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/5c9t9b

碩士 === 國立臺北科技大學 === 資訊工程系研究所 === 105 === This thesis proposed a mathematical model for performance analysis in the OpenFlow-based SDN architecture to analyze the performance under different traffic conditions. To analyze network performance, those SDN controller and switches were modelled by M/M/1 queue. The bandwidth is adopted as service rate and the data plane is considered as a Jackson network. Regarding for the situation that packets may be loss, it added the retransmission probability as the parameter to show that is a network in highly congested what the effect of packet loss would be. In order to examine the accuracy of proposed model, the research did intensive simulations to investigate the network performance between the model and semi-real operations through simulations. In simulation setup, the thesis used Ryu controller and Open vSwitch(OvS) which support OpenFlow protocol, and applied Mininet as the network emulator. The simulation scenario considered for multiple SDN switches topology. The OvS orders packet commands to classify into four types and sends them to the corresponding queues to acquire different bandwidth. There are many experiments designed by this thesis and the results showed that the performance evaluated by mathematical analysis would be very close to the practical network operation, especially when the traffic were mostly Poisson-based data flows, instead of deterministic-based streaming ones.