I've seen this document but at the beginning of the paragraph it speak about "HiGig / 42G" and the command to configure that thing. After it said: "This feature is supported only for the Cisco Nexus 9500 Series switches with the 9636PQ line card. It is not supported for the Cisco Nexus 9300 Series switches."
My question is: What it's not supported? Cut-through switching or just the command: switching-mode fabric-speed 40g (to support 40G instead of 42G)?.