SDN Controller Placement With Availability Upgrade Under Delay and Geodiversity Constraints

An inherent problem in Software-Defined Networking (SDN) is the Controller Placement Problem, which addresses how many controllers to deploy network, and where place them. Several variants of this have been addressed researched find placements that adapt best different contexts. In article, we address a more complex variant problem, satisfy QoS requirements offer robustness against disaster-based failures. We joint optimization controller placement finding tree subgraph can be upgraded enhanced availability, order delay availability constraints. Additionally, consider geodiversity constraints as way enhance