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i executed the cmd reset system on the WLC.now i ahve lost all my 19 APS that were joined to the controller.How do i get the APs back to the controller.
You might try turning on Master Controller Mode on the WLC.
You will want to make sure that any other controllers (if you have any others) do NOT have master controller mode enabled.
Also, in certain situations, I have performed a SHUTDOWN and NOSHUTDOWN on the ports feeding the APs to give them a kick in the pants.
I hope this helps,