Predictive Switch-Controller Association and Control Devolution for SDN Systems
Xi Huang, Simeng Bian, Ziyu Shao, Hong Xu

TL;DR
This paper introduces POSCAD, a predictive online scheme for dynamic switch-controller association and control devolution in SDN, improving scalability, reliability, and latency through online decision making and predictive scheduling.
Contribution
It develops a novel joint online scheme that integrates predictive scheduling for SDN control plane optimization, addressing the trade-offs in dynamic association and devolution.
Findings
POSCAD achieves near-optimal costs without prediction.
With prediction, POSCAD reduces latencies significantly.
Performance is robust against prediction errors.
Abstract
For software-defined networking (SDN) systems, to enhance the scalability and reliability of control plane, existing solutions adopt either multi-controller design with static switch-controller associations, or static control devolution by delegating certain request processing back to switches. Such solutions can fall short in face of temporal variations of request traffics, incurring considerable local computation costs on switches and their communication costs to controllers. So far, it still remains an open problem to develop a joint online scheme that conducts dynamic switch-controller association and dynamic control devolution. In addition, the fundamental benefits of predictive scheduling to SDN systems still remain unexplored. In this paper, we identify the non-trivial trade-off in such a joint design and formulate a stochastic network optimization problem that aims to minimize…
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Taxonomy
TopicsSoftware-Defined Networks and 5G · Caching and Content Delivery · Advanced Optical Network Technologies
