but to answer your further case. The point is you don't need to replace all the TOR switches. Only the ones that deal with high network IO.
to change protocol you need gateways/loadbalancers either at the edge of the DC just after the public end points, or in the "high speed" areas that are running high network IO. For that to work, you'll need to show its worth the engineering effort/maintenance/latency.
to change protocol you need gateways/loadbalancers either at the edge of the DC just after the public end points, or in the "high speed" areas that are running high network IO. For that to work, you'll need to show its worth the engineering effort/maintenance/latency.