Abstract
Software defined networking (SDN) complements low power Internet of Things (IoT), since the former offers dynamicity and the latter is susceptible to environmental changes. The SDN controller placement refers to the selection of the IoT sensors running the controllers, while the switch assignment is the process of mapping each sensor to a controller. Both choices affect the volume of the control traffic, a significant metric in low power wireless IoT networks where bandwidth is scarce or energy consumption is important. In this paper, we model an optimization problem for minimum control traffic, assess its complexity and devise a set of heuristic algorithms for expediting its solution. We initially present a fast and simple heuristic algorithm, which is then extended to two iterative algorithms with even better performance at the cost of time complexity. Our simulations and testbed experimentation reveal close to optimal performance of all heuristic solutions with significantly less computation time than explicitly solving the optimization problem. At the end, we provide insights for further enhancements of these heuristics with a bias for minimum control delay.
Highlights
Preliminary results of this work have been presented at IEEE CCNC 2019 [1].Software defined networking (SDN) decouples the control and data planes, transferring the control logic to the SDN controllers and leaving only the forwarding actions to the network equipment.The network devices can be switches, computers or sensors, which have to forward packets between each other according to a controller defined strategy
The performance of the previous heuristic is in general satisfactory, examining a single value is obviously an extreme scenario for a more generic family of iterative heuristic solutions
While the median value of cost increase does not surpass 5% even for our simple initial heuristic, the importance of applying an iterative heuristic algorithm becomes greater when we look at worst case cost increases
Summary
The network devices can be switches, computers or sensors, which have to forward packets between each other according to a controller defined strategy. SDN architecture relied on a single controller communicating with all devices, named SDN switches. This approach is not scalable and was soon outplaced by an advanced design exploiting more than one controller. According to this design, the load of the controller-to-switch (Ctr–Sw) traffic is shared between the controllers; at the expense of extra traffic for the controller-to-controller (Ctr–Ctr) communication
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