I left the industry in about 2013, due to serious ilness, so I haven't kept up with industry develoopments much since then. When I left, 10GbE was gaining traction as the default server access speedin enterprise datacenters, and was only just beginning to phase out bundles of GbE. Much faster speed were availlable and obviously still are, but how much of this have become pratical common use,by now? is 25GbE the new standard for host access speeds? I assume, that leaf-spine has now become the clearly dominant DC architecture, so if running 25 GbE leaf ToR switches, what is commonly used for uplinks to spines? 100 GbE?
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