As stated in the document shared earlier If all stack members are powered up around the same time, the MS with the lowest MAC address will be elected the Active switch. If the stack members are not powered up around the same time, the MS with the highest uptime will be elected the Active switch, regardless of its MAC address. The Active switch will remain the Active switch until it's either rebooted or an event occurs that forces another Active switch election (such as stack ports being reconnected).
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