Due to growing customer demands, the network infrastructure of modern data centers is transforming from a rigid and unwieldy model to a disaggregated, flexible, and agile one. Modern data centers require large, high-capacity networks that can scale, accommodate different traffic patterns, and are easy to automate at an affordable cost. Fixed form-factor switches (FFF) and disaggregated network operating systems in a leaf/spin Clos architecture can build a scalable, robust, and agile network in the most cost-effective way possible.