A Novel Control Plane Optimization Strategy for Important Nodes in SDN-IoT Networks

Control plane delay minimization-based capacitated controller placement algorithm for SDN

“…While energy consumption minimization was addressed when designing controller placement strategy in SDN [9,10], network signaling cost may also have a significant impact on the traffic transmission performance through the network; hence, some research works considered the cost for deploying SDN controllers and proposed cost-effective controller placement strategies [11][12][13][14][15][16][17][18]. The authors in [11] considered the signaling cost of transmitting flow setup requests from switches to their associated controllers in SDN.…”

“…Dynamic controller placement problem of SDN was addressed in [14][15][16]. Under the assumption that controllers were statically deployed in the network and switches were statically associated to the controllers, the authors in [14] studied dynamic controller association problem.…”

“…By formulating the problem as an online optimization problem which minimizes the overall cost caused by transmitting flow setup requests and the maintenance cost of the controllers, a hierarchical two-phase algorithm was proposed to obtain the suboptimal controller placement strategy. In [15], the authors proposed a two-level hierarchy (master and slave) control framework and designed a slave controller placement strategy to optimize control cost and control plane delay. In [16], dynamic controller placement and flow management problems were jointly considered for SDN and a joint optimal strategy was proposed to minimize maintenance cost and maximize controller utilization as well.…”

“…The previous works in [9][10][11][12][13][14][15][16][17][18] focused on minimizing energy consumption or designing cost-effective controller placement strategies for SDN; however, it can be observed that the transmission delay or propagation delay between switches and controls may affect network performance significantly; thus, it is highly desired to design delay minimization-based controller placement strategy. The control plane delay between switches and controllers was considered in designing the optimal SDN controller placement strategy [19][20][21][22][23][24].…”

“…As the controllers are required to conduct signaling interaction with their associated switches as well as with other controllers, the problem of controller placement is of particular importance as the location and capability of the controllers may highly affect the signaling transmission performance in control plane, i.e., the signaling interaction performance between switches and controllers, and that between controllers. Some previous research works addressed the energy consumption or the transmission cost required for transmitting signaling messages between switches and controllers and proposed controller placement strategies which aim to achieve the lowest energy consumption or the minimum transmission cost [9][10][11][12][13][14][15][16][17][18]. However, as a major performance metric characterizing service transmission performance, the signaling transmission delay should be considered when designing optimal controller placement strategies.…”