[isotopp]

The image is from 2012 and describes a topology, but not a technology.

Today you'd rather use Arista 7060, 7050cx orJuniper 5200 as ToR. You'd not build 1:1, but plan for it in terms of ports and cable space, then add capacity as needed.

Almost nobody in an Enterprise environment actually needs 1:1, unlike hosters or hyperscalers renting nodes to others. Even then you'd probably being able to get away with a certain amount of oversubscription.