I am looking to change/set the global AP username/password for all APs connected to a 8510 controller. My question would be if any downtime/network blip should be expected? I have tested with a single AP on a test controller with no issues however our environment is very sensitive to downtime.
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Rule of thumb is that changing the controller hostname (HA or Mobility), changes in wlan or anything associated to the wlan and interfaces will have some impact.