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Troubleshooting the Access Point to Cisco Controller Join Process

Ensure that your controller is running the latest Cisco Wireless Controller Software Release

Note

as specified in the access point's data sheet.

Access points can fail to join a controller for many reasons: a RADIUS authorization is pending;

self-signed certificates are not enabled on the controller; the access point's and controller's regulatory

domains don't match, and so on.

Controller software enables you to configure the access points to send all CAPWAP-related errors to

a syslog server. You do not need to enable any debug commands on the controller because all of the

CAPWAP error messages can be viewed from the syslog server itself.

The state of the access point is not maintained on the controller until it receives a CAPWAP join

request from the access point. Therefore, it can be difficult to determine why the CAPWAP discovery

request from a certain access point was rejected. In order to troubleshoot such joining problems

without enabling CAPWAP debug commands on the controller, the controller collects information for

all access points that send a discovery message to it and maintains information for any access points

that have successfully joined it.

The controller collects all join-related information for each access point that sends a CAPWAP

discovery request to the controller. Collection begins with the first discovery message received from

the access point and ends with the last configuration payload sent from the controller to the access

point.

You can view join-related information for up to three times the maximum number of access points

supported by the platform for the 2500 series controllers and the Controller Network Module within

the Cisco 28/37/38xx Series Integrated Services Routers.

The maximum number of access points varies for the Cisco WiSM2, depending on which

Note

controller software release is being used.

When the controller is maintaining join-related information for the maximum number of access points,

it does not collect information for any more access points.

An access point sends all syslog messages to IP address 255.255.255.255 by default when any of the

following conditions are met:

• An access point running software release 8.0.x.x or later has been newly deployed.