H-REAP APs disassociate clients on WLC reset

Unanswered Question
Jun 9th, 2009

We have had reports from a site where we have deployed H-REAP APs (controller is off-site) that when the controller went off-line (power blip) all the clients were disassociated immediately. We are using WPA/PSK.

Now my understanding is that H-REAP APs should continue to handle clients under these circumstances but the reports suggest that they did not.

Does anyone know under what circumstances this might happen.

And for example can clients continue to roam when the link to the WLC goes down?

Thanks in advance.

I have this problem too.
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Vinay Saini Tue, 06/09/2009 - 03:25

please make sure , Local switching is enabled for the WLAN

Thanks

Vinay

robinwenham Tue, 06/09/2009 - 03:27

Yes that is all set up - the APs and clients operate correctly in H-REAP mode and local switching, local IP address etc.

robinwenham Tue, 06/09/2009 - 03:31

As an aside to this, we can't recreate the problem here in the office with an AP connected to the same WLC.

Leo Laohoo Tue, 06/09/2009 - 14:21

Did the power outage affect the WLC only or the entire site?

Did you say users lost associating to the AP and not lost contact to applications that were affected (possibly) by the power outage?

Vinay Saini Tue, 06/09/2009 - 18:22

To debug further , please see the logs on the AP when this problem happens. You can dump all the logs to a syslog server , so incase the problem happens we can dig out the logs based on time to narrow down the problem.

robinwenham Tue, 06/09/2009 - 23:53

Thanks to all for their replies.

The power outage only affected the WLC which was on a different site.

Testing in our office has showed that the AP does continue to provide service when the WLC is down, but every time the AP re-associates with a controller - either the original one or a fallback one - the radios are downed and the clients all dis-associated before the new configuration is applied and the client re-associated.

This appears to be by design - does anyone know if this can be prevented?

Thanks

Leo Laohoo Wed, 06/10/2009 - 17:07

Hi Robin,

H-REAP or not, when the AP Joins the controllers, all radio interfaces would go down and up on purpose. This is caused by the LAP downloading and applying the configs.

Hope this helps.

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