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I have some 2920 that are running in our DC which for some reason was never stacked, and now I'd like to fix that after the fact. I have all the gear, and I've done stack installations on brand new switches before, but what I can't find any info on is what will happen with the port configurations on the switches when you stack them? Will the be kept or do I have to redo them?

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Unfortunately, the command to enable stacking ("stacking enable") also wipes the config. This includes all the global config as well as the port configuration.

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