Amazon CEO Andy Jassy has been on a highly publicized crusade lately to crush corporate bureaucracy. His goal? Flatten the org chart, remove the layers of middle management that slow things down, and let individual teams move faster.
As it turns out, AWS’s network engineers took his mandate incredibly literally—they just applied it to their data centers.
For thirty years, the networking industry has been stuck with a rigid hierarchy known as the "fat-tree." In this model, data center architecture looks exactly like an aging, bloated corporate org chart. To move a packet of data from one server rack to its neighbor, the data can’t just walk across the hallway. It has to climb the corporate ladder—from Top-of-Rack (ToR) switches, up to aggregation layers, and finally to the "executive" spine switches—before trickling back down to its destination.
Every layer in this network acts exactly like a middle manager: it adds latency, drains power, and serves as a potential bottleneck. While the fat-tree has been the workhorse of the cloud, AWS is officially tearing it down. They are replacing it with a radically flat alternative called the Resilient Network Graph (RNG). By taking quasi-random graph theory out of academia and into hyperscale production, AWS has figured out how to commoditize randomness.
