POX-PLUS: An SDN Controller with Dynamic Shortest Path Routing

Routing in SDNs exploits the controller's global view and computes paths either using a single-source shortest path algorithm (e.g., Dijkstra, Bellman-Ford) or an all-pairs shortest path (APSP) algorithm (e.g., Floyd-Warshall). Existing APSP routing algorithms for SDNs have substantial performance limitations in handling changes in the routes due to link deletion (failure) and link insertion (recovery). In this paper, we present POX-PLUS, a new SDN controller based on the popular POX controller. POX-PLUS includes a new routing module called DR-APSP (Dynamic Routing based on All Pairs Shortest Paths) that computes and efficiently maintains shortest paths between nodes in the SDN.