Software Defined Networking across Distributed Datacenters over Cloud

Cloud computing, in particular its system spread across several data centers, poses a unique set of networking challenges and management problems. This paper presents our design, implementation, and experience in tackling these challenges by using the concepts and technologies of software-defined network (SDN). We define a network abstraction to incorporate the physical and virtual data plane within a data center. We propose a new network primitive to address the interconnection issues among multiple data centers. A policy plane consolidating these mechanisms provides a programmable interface to enable a wide range of policies and new networking mechanisms. We present the performance result on a real deployment over the production networks. The experience and initial performance results demonstrate that the SDN is a promising solution to cloud networking.