"Google’s data centers power the most demanding interactive, storage, and cloud services in the Internet, all requiring the highest levels of availability. Bandwidth and scale demands are growing exponentially, doubling approximately every year. Thus, Google’s data center network architecture must deliver cost-effective networking operating at the granularity of tens of thousands of servers, all while maintaining operational simplicity. We present a first look into Google’s data center network design and implementation, focusing on the data, control, and management plane principles underpinning five generations of our network architecture."