Hi, not all the time but did some
What i would do if i have 3 switches for a stack
First switch:
switch 1 priority 15
Second switch:
switch 1 renumber 2
reload
no switch 1 provision
switch 2 priority 13
Third switch
switch 1 renumber 3
reload
no switch 1 provision
switch 3 priority 11
Now stack em and power them up.
Example:
Last week i had to replace a 3750 switch which died in a stack of 4. It was switch 3.
( The whole stack was still running, except for switch 3.)
So, got a new switch:
switch 1 renumber 3
reload
no switch 1 provision
switch 3 priority 11
Then i pasted the config from the backup into the new switch, but only the part of switch 3.
starting from interface Gi 3/0/1 to 3/0/48
Then i removed the stack cables to switch 3 and replaced the switch and stacked the new one up .
Then i powered on switch 3.
The switch became a new part of the stack, same config, right priority etcetc.
The other switches in the stack kept running while doing this operation. .
So home safe. :-)