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What option do I have to interconnect the 3 switches? Do I need core/distributio to connect them?
One option would be to use fiber. You'll need one of the SPF option modules for the 3750-Xs. Don't need core/distribution but if you have that already, and it's within copper distance, that would be another option.
BTW, the 3rd switch would not be part of the stack when unable to use the stack cables.
