Troubleshooting Cisco 5760 Controller: AP Joining Issues

Checklist for Adding APs to Cisco 5760 Controller

Q: You have received a new Cisco 5760 Controller and have gone through the initial startup wizard.You are now trying to add APs to the controller, but these are not joining.Which three checks should you do next? (Choose three.)

Check that the controller has enough AP licenses.Check that the controller has enough AP licenses.Check that the radios are not in a shutdown state.

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Question

You have received a new Cisco 5760 Controller and have gone through the initial startup wizard.

You are now trying to add APs to the controller, but these are not joining.

Which three checks should you do next? (Choose three.)

Answers

A. Check that the correct time is set on the controller.

B. Check that the controller has enough AP licenses.

D. Check that option 53 has been set in the DHCP scope.

E. Check that the radios are not in a shutdown state.

F. Check the country code of the controller. The APs do not join the controller if the country code does not match.

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Explanations

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A. B. B. D. E. F.

BCE.

http://www.cisco.com/c/en/us/support/docs/wireless/2500-series-wireless-controllers/113034-2500-deploy-guide-00.html#anc10

When APs fail to join a controller, it can be due to various reasons. To troubleshoot the issue, the following checks should be performed:

A. Check that the correct time is set on the controller: The APs use the controller's time to synchronize their own clock. If the controller's time is incorrect, the APs may fail to join. Therefore, it is essential to verify that the correct time is set on the controller. This can be checked by logging into the controller and checking the time on the GUI or CLI.

B. Check that the controller has enough AP licenses: The Cisco 5760 Controller requires licenses to support a specific number of access points (APs). If the controller does not have enough licenses to support the APs, then they will not be able to join. To verify the available licenses, log in to the controller and navigate to the License Information screen on the GUI or use the "show license summary" command on the CLI.

C. Check that option 53 has been set in the DHCP scope: The APs use DHCP to obtain an IP address and the IP address of the controller. If the DHCP scope does not have option 53 set to the IP address of the controller, the APs will not know where to find the controller. Therefore, it is necessary to verify that option 53 has been set in the DHCP scope.

D. Check that the radios are not in a shutdown state: If the AP radios are in a shutdown state, they will not be able to join the controller. Therefore, it is crucial to verify that the radios are not in a shutdown state. This can be checked by logging into the controller and navigating to the Access Points screen on the GUI or by using the "show ap summary" command on the CLI.

E. Check the country code of the controller: The APs are manufactured for specific countries and regions, and they operate on specific frequencies that are compliant with those regions' regulatory requirements. Therefore, it is necessary to verify that the controller's country code is correct and matches the APs' country code. This can be checked by logging into the controller and navigating to the Wireless screen on the GUI or by using the "show wlan 802.11a/b/g/n/ac country-code" command on the CLI.

In summary, to troubleshoot APs that are not joining a Cisco 5760 Controller, the following three checks should be done:

Check that the correct time is set on the controller.
Check that the controller has enough AP licenses.
Check the country code of the controller. The APs do not join the controller if the country code does not match.

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