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You can reset or force a redundancy switch over for one supervisor. This is "hitless" but supervisors will no longer be in redundancy. It usually takes several minutes for inactive supervisor to reload.
When you reset or redundancy switch over the 2nd supervisor, the chassis will go off-line for several minutes. (Note: switching over to the 2nd supervisor already running different IOS seems to be just a little quicker, but line cards are restarted which is what causes the "hit".)
