Hi thanks for your reply, just to follow up I have a stack with 3 switches I'm removing the first two. The 3rd isnt going to be toughed. I'm adding two swiches that are going to be 1, and 2. If I have a config on the 3rd switch will that config copy over to the new config of the stack I'm merging in.
I think that should be fine. Although, I would get in that third switch and unprovision the orignal two so that when you do a show switch you only see that switch.. That way when you reconnect it to the new stack it will automatically discover them.
Be sure to double check the priority on the switches so you know who will be master. Personally, if I can, I like to power on the switches in the same order as they are in the stack. Power master/switch 1 first then 2 then 3. I have had fun trying to renumber switches in stack after all heck broke lose due to not configuring switch stack priority before powering everything up.
But like I said, as long as you don't have to renumber the switch then you should be fine. Your trick will be ensuring that that switch will still be switch #3 in the new stack. I'd give the master priority 14 (leave 15 open in case something comes up in the future) then switch 2 priority 10 then switch 3 priority 0 to ensure the numbering. And then boot them in that order.
Changing priority does not require a reboot of a switch but changing switch number does.
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