Software Defined Routing System

Traditional distributed routing protocol just can calculate the shortest forwarding path based on restricted routing metric (e.g. least hops, lowest cost, etc.). Due to partial-view and selfishness of local strategy, the routing calculation results usually are not optimal. Software defined network(SDN), as the representative of centralized control mechanism, can obtain real-time network status, perform routing calculation from global network view, and install routing strategies, hence to promote network toward optimal target. Drawing further on this, this paper firstly puts forwards Software Defined Routing System (SDRS), by introducing centralized control mechanism into routing system on basis of distributed paths generated by distributed routing protocol. Centralized controller can calculate centralized paths and selectively deploy centralized paths into network according to orchestration strategy. SDRS not only preserves the properties of flexible survivability and fast self-healing in distributed routing protocol, but also keeps global optimal ability of centralized controller. Finally, we implement SDRS prototype, and our experimental results reveal that SDRS can obtain the same routing convergence performance with distributed routing protocol and a better self-healing ability than pure centralized framework.