Abstract
Software-defined networking (SDN) is a paradigm shift in modern networking. However, centralised controller architecture in SDN imposed flow setup overhead issue as the control plane handles all flows regardless of size and priority. Existing frameworks strictly reduce control plane overhead and it does not focus on rule placement of the flows itself. Furthermore, existing frameworks do not focus on managing elephant flows like RTSP. Thus, the proposed mechanism will use the flow statistics gathering method such as random packet sampling to determine elephant flow and microflow via a pre-defined threshold. This mechanism will ensure that the control plane works at an optimum workload because the controller only manages elephant flows via reactive routing and rule placement respectively. Reactive routing has reduced link bandwidth usage below the pre-defined threshold. Furthermore, rule placement has increased average throughput and total transfer to 238%. Meanwhile, the data plane switches will be able to forward microflows via multipath wildcard routing without invoking controller in greater responding time by 85 ms faster in two Transmission Control Protocol (TCP) traffic and achieved 11% and 12% higher total transfer size and throughput respectively. Hence, the controller’s workload reduced significantly to 48% in two TCP traffic.
Highlights
Software-defined networking (SDN) is a new concept conceived to solve these issues
Elephant flow detected on switch-4 is exceeding flow threshold, consuming high bandwidth between switch-4 and hosts and utilising all available network resources as the path was assigned by the controller using Dijkstra’s algorithm
The proposed mechanism used an efficient packet-sampling tool such as sFlow and sFlow-RT as packet-analysing engines to segregate flows into two categories, such as elephant flow and microflow via elephant flow detection script that is invoked in SDN application layer
Summary
Software-defined networking (SDN) is a new concept conceived to solve these issues. Many research said that the SDN concept is the future of Internet architecture as it provides flexibility for users to manage the network. SDN provides an abstraction of the network, which allows network administrators to configure those network devices seamlessly across the enterprise networks. SDN has simplified the overall network in terms of management and provided a global view on the network topology. SDN manages the networks via centralised controller with the controller located on the control plane. Besides simplifying the network architectures, SDN is able to improve Quality-of-Service (QoS) of an industrial cyber-physical systems, typically robotic cyber-physical system using SDN-based routing mechanism [1] and network slicing purpose [2].
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