Re: OT-AP1010 registering in unwanted WLC

Hi Mohammad.

Though I haven't met any explicit requirements for LAPs IOS version
against WLC software version, there should be a good reason they come
bundled. :-)

Please check this FAQ with regard to LWAPP (WLC OS ver 4) vs CAPWAP (WLC
OS ver 5) protocols.
http://www.cisco.com/en/US/products/ps6366/products_qanda_item09186a008064a991.shtml

If I got your situation right, none of the other working 13 LAPs 1000
got registered with a newer version of WLC. If you run different major
releases on your WLCs, then according to the FAQ, your upgraded LAPs
1000 would first try to use CAPWAP protocol and hence could end up being
registered on WLC-2.

The easiest way to check is to cut off those AWOLing APs from
communicating to WLC-2 and check for error messages on WLC-1. Also try
to check messages no those LAPs and check how they follow the process of
registration, that should reveal why they actually are choosing one WLC
over another.

Here is a LAP registration process in details:
http://www.cisco.com/en/US/tech/tk722/tk809/technologies_tech_note09186a00806c9e51.shtml

And AP communication protocol details (WLC OS ver 5.2):
http://www.cisco.com/en/US/docs/wireless/controller/5.2/configuration/guide/c52lwap.html#wp1104685

Try to get a 100% control over how your LAPs are registered with your
WLCs so that you know which step of the registration process they use
when they join a particular WLC. Assume nothing, the best way is to
check log messages on both LAP and WLC end. :-)

HTH
A.

mzsaeed_at_gmail.com wrote:
> Hi,
>
> Need help. We have environment in which one WLC-1 is configured to support L2
> LWAPP Transport mode, had 15 AP1010 registered in it.
>
> Second WLC-2 is in different subnet, configured to support L3 LWAPP Transport
> mode, had 37 AP's registered in it, both 1000 and 1130 series models.
>
> Now we had to switch first WLC-1 to a different module on the core switch, so
> all 15 AP's got unregistered and when WLC-1 became available, it has only 13
> APs, two of them are somehow not registering with WLC-1 but discovering WLC-2
> using L3 discovery mechanism and registering in WLC-2.
>
> I have reset these two AP's, and gave the IP of WLC-1 as Primary WLC while
> they were registered in WLC-2, saved the config, reset the AP and they still
> go and register in WLC-2.
>
> The one thing that I suspect is, that WLC-2 has higher version of code than
> WLC-1, now as these two AP's once registered in WLC-2 and got higher version
> of code from WLC-2, probably thats why they are not registering with WLC-1 as
> its code is of lower version?
>
> Any comments or solution to this problem without upgrading the code on WLC-1?
> And if at all the code version difference is the reason for the problem?
>
> Appreciate very much for any help....
>
> Thanks,
>
> Mohammad Saeed
>
>
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Received on Tue Jul 07 2009 - 22:53:16 ART