My two, two switch stacks have been up for over a year after software upgrades and several reboots, still no issue in the dashboard. I don't mind adding a second cable to the switches that have the dedicated stack ports on the back just to be safe though. However, I also have a pair of MS425-16 and if I use both the 40GB/s ports for stacking, then I lose the 40GB/S uplinks to my other building.
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