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Can we have both uplinks on 1GBe on switch 1 and the 10 GBe links on switch 2?
Sure.
I know within the same module you cannot mix the 2 interfaces but how about within a switch stack?
You can't use a gig and 10g in the same module pair (1,2 and 3,4) but you should be able to use gig in 1,2 and 10g in 4 or 10g in 2 and gig in 3,4.