Abstract
The separation of the control plane and the data plane in the Software-Defined Networking (SDN) architecture makes it easier and more feasible to implement per-flow Quality of Service (QoS) provisioning in the network which is beneficial for flows that require special QoS handling such as VoIP and video streaming. Applying QoS mechanisms to a distributed single-layered set of switches in the context of SDN has shown promise in previous studies. Using a test framework that was previously developed for QoS algorithms and networking topologies in SDN, this study explored how layers in the network topology affect the performance of QoS in the network. This is in order to replicate real-world networking scenarios where packets travel through layers of networking equipment. Generally, results have shown that having less layers in the network means better performance. However, this does not mean that adding layers creates a material disadvantage. Results also show that despite adding layers to the networking topology, the SDN distributed Leaf-enforcement of QoS performed better or as good as compared to the traditional centralized Core-enforcement of QoS. This is despite having leaf-enforced environments have more points of enforcement as layers are added.
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