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The following article presents a comparison of flow forwarding between traditional and software-defined networks (SDN), focusing on the impact of routing protocols and policies. The present work evaluates the efficiency of SDN routing (bandwidth and packet loss) against the performance obtained in traditional networks and estimates the performance variation when using ad-hoc software implementations such as OpenVSwitch [1].

The following article presents the most important aspects of routing technologies and the QoS (Quality of Service) of the SDN architecture. The interaction of SDN with traditional or legacy networks is discussed in depth and concepts related to flow management are developed. Additionally, the analysis of the Open Flow protocol is included.

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