Title :
On the Capacitated Controller Placement Problem in Software Defined Networks
Author :
Guang Yao ; Jun Bi ; Yuliang Li ; Luyi Guo
Author_Institution :
Dept. of Comput. Sci., Tsinghua Univ., Beijing, China
Abstract :
Controller placement is a key problem in software defined networks (SDNs). Previously, the solution to this problem only focused on propagation latency but ignored the load of controllers, which is a critical factor in real networks. In this letter, we define a capacitated controller placement problem (CCPP), taking into consideration the load of controllers, and introduce an efficient algorithm to solve the problem. The evaluation shows that the new strategy can significantly reduce the number of required controllers, reduce the load of the maximum-load controller, and reduce the radius stretches compared with the K-center strategy with dynamic controller provision or dynamic scheduling.
Keywords :
software radio; CCPP; K-center strategy; capacitated controller placement problem; dynamic controller provision; dynamic scheduling; maximum-load controller; propagation latency; software defined networks; Bandwidth; Control systems; Dynamic scheduling; Heuristic algorithms; Process control; Servers; Topology; SDN; controller; placement;
Journal_Title :
Communications Letters, IEEE
DOI :
10.1109/LCOMM.2014.2332341