A system includes spine network switching devices, leaf network switching devices, and server computing devices. The leaf network switching devices are not connected to one another. Each leaf network switching device is connected to each spine network switching device. Each server computing device is connected to each leaf network switching device. Each leaf network switching device transmits an advertisement indicating uplink bandwidth to each spine network device. Each server computing device distributes network traffic through the leaf network switching devices to the spine network switching devices based on the uplink bandwidth that the leaf network switching devices advertise.