We are unable to get ip address by AP

[Afroz Alam]

I have cisco wireless controller 5760 and approx 100 Cisco AP K9 170I is connected but few days sometimes we are unable to connect wifi. Only show obtaining ip address and some time connect automatically but if I put static ip then it is working. Could you please help anyone to fix it. 

[Mark Elsen]

   - What provisioning mechanism are the APs used to discover a controller
   + Post the full boot process of one of those APs

  - Advised : ref: https://www.cisco.com/c/en/us/support/docs/wireless/wireless-lan-controller-software/200046-tac-recommended-aireos.html
                   Added : verify the controller model first and use the subsequent advised release.
           

    + You may have a checkup of the controller's configuration using : WirelessAnalyzer input (procedure) for AireOs controllers
       and feed the output from that into Wireless Config Analyzer

   M.

[Rasika Nayanajith]

What is the uptime of the WLC? What version of IOS-XE running on it ?

If it has not rebooted for a long time, I would do that and check the behaviour.

Since these are EoL products no active support from Cisco.

HTH
Rasika
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[Afroz Alam]

I have already restarted many times. But unable to fix. It is old model and we have not license and It was working fine but few days ago we are getting issue like this didn't obtain ip address mostly peak time. May be controller issue.but why is not providing ip address. 

[Mark Elsen]

  - You may also check the controller's logs , when this is happening , but it  is also kind of necessary to provide the full boot process of one of these APs.

 M.

[Afroz Alam]

Every time is happening just I connect this AP and If I go other floor then not connect and if my mobile is connect same AP but other guy is trying to connect then showing obtaining ip address only but not connect and after sometimes connect automatically then again disconnect after few times. 

[Mark Elsen]

 - You may also check the controller's logs , when this is happening , but it  is also kind of necessary to provide the full boot process of one of these APs.

 M.

[Dipal Thakkar]

Hi,

Check the DHCP configurations on WLC and DHCP server. Perform packet capture on client device and analyze it.

Thanks,

Dipal

[Rich R]

And most importantly start planning an upgrade to a supported WLC and APs or cloud based solution eg Meraki
The APs are end of support since April 2024
https://www.cisco.com/c/en/us/products/collateral/wireless/eos-eol-notice-c51-740712.html
and the WLC went end of support in 2022:
https://www.cisco.com/c/en/us/obsolete/wireless/cisco-5760-wireless-lan-controller.html

[MHM Cisco World]

Chevk dhcp it can you have dhcp ip exhaust

MHM