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I want to change IP address for WLC in production, should I convert Access Point from LWAP to IOS then convert again to LWAP ?
LWAPP AP's use hostnames for their associations. I would suggest clearing your switch/router arp cache and you should be OK as long as your WLC keeps the same name.
The best way is configure your controlelr as primary controller for all APs. You can do so going to wireless tab and then click on each AP detail and configure this controller as primary controller.
Also if you have WCS you can do the same in one go for all APs and after that even if controller ip address is changed they will stay join to this controller.
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And I will try to do that to see the results.