> > > I would imagine (though no claims that my imagination aligns with reality) > that any switch with QSFP28 ports which advertise 4x25G breakout mode will > also support 4x10G. The former might be more obviously advertised. > > I think this is correct, the only caveat I'd add is for some switches (at least I found with an Arista 7060X and optic connectors) you need a 40G connector on the switch side rather than a 100G, because it expects RSFEC for 25G+ (and we don't have that in our 10G core) and it will not allow the port to be configured for 10G breakout unless you have a 40G connector.
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