9120AXI-B and Cisco 9800 WLC, AP doesn't maintain its config?

[victoriabardy]

Hello all,

I had to stage and roll out one of our offices with the cisco 9120AXI-B aps using our new 9800 WLC.  I have had some strange behavior from a few of our ap's.  For example, there was a power blip on one of our cisco switches and two of the 9120 aps went down and never recovered.  I grabbed one of them and when I got it connected to a different port and logged into the cli, it still had its old ip configuration.  I went to re-install it and even though the config is there, its not joining the WLC.  Additionally, when I change the set up to use dhcp so I can get it to join the wlc, it comes up and shows up on the WLC.  However when I change the ip to the static and change the switchport back to a trunk, the ap doesn't rejoin the WLC???

Does anyone here on the forum have any idea why this is happening?  We are running our WLC on bootflash:C9800-40-universalk9_wlc.17.03.03.SPA.bin.

Please let me know if you do.

Thank you.

[Haydn Andrews]

what's your config of the switch port before and after you change it to trunk.

Suggest using DHCP reservations rather than static IP addresses

[balaji.bandi]

DHCP Knows options where the WLC controller when you configured static IP, this does not have full information of where the WLC is located. this required some Manual config.

I am not a great fan of static IP for AP, it should always use DHCP, so AP can plug in any stack which has a different IP pool and centralize DHCP to have WLC information for onboarding AP.

[Leo Laohoo]

Upgrade to 17.3.4c and make sure to upgrade the ROMMON to 17.3(3r).