Abstract
The idea of programmable networks has recently re-gained considerable momentum due to the emergence of the Software-Defined Networking (SDN) paradigm. In this context SDN is being looked upon as a promising paradigm that has the power to change the way networking is done. SDN, often referred to as a “radical new idea in networking”, promises to dramatically simplify network management and enable innovation through network programmability. This paper surveys the state-of-the-art in programmable networks with an emphasis on SDN. We provide a historic perspective of programmable networks from early ideas to recent developments. Then we present the SDN architecture and the OpenFlow standard in particular, discuss current alternatives for implementation and testing of SDN-based protocols and services, examine current and future SDN applications, and explore promising research directions based on the SDN paradigm. In this survey, we are giving the overview of the software defined networking architecture and OpenFlow.
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