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Thank you for the answer.I was afraid to lose control under AP, so those will be trying connect do disabled fabric WLC and never found new WLC IP so I did it my way and it also worked :-add new WLC as tertiary controller-disable WLC role on EWC-AP ...
My plan is to clear the config on all 181 AP. Remove EWC, enable wireless fabric on cloud 9800-CL, provision AP again using CatC. I'm worry that AP, if not reset to factory, would be all time looking for EWC and wont ever join new 9800-CL. Maybe sett...