Re: WLC5508 with LAP1142N ignoring Radio Policy - Page 2

Florian Kelsch · ‎05-03-2012

Hi..

I've got a weird problem with the WLC5508 and LAP1142Ns..

We have a few WLANs using all radios.. And also one that is set to only use 802.11g.. however.. a lot of clients using that WLAN are shown as using 802.11a for connection.. (Apple iPad2 devices).. some use g, but most of them go in with a.

why?

I tried rebooting the iPad.. turning off and on the WiFi.. resetting the LAP that it was connected to.. resetting the Networksetting on the iPad..

all the things I could think of where a dormant setting might have hidden..

it just doesn't care.. always in the client list with protocol 802.11a...

help.. I want the iPads on g...

Thank you..

Thomas

grabonlee · ‎05-08-2012

Hi

I decided to create the same set up with 1131 and 1141 and found no problem connecting with the specified radio type. My controller is also on 7.2.103. Please take a look below. In my opinion probably there is an issue with 1142 APs, which is strange as the AP downloads its code and WLAN config from the Controller. Secondly, I would suggest that you take a look at the wireless adapter configuration of the client to ensure that it's radio type is set to Auto and not default to dot11a, b, or g.

(Cisco Controller) >show sysinfo

Manufacturer's Name.............................. Cisco Systems Inc.
Product Name..................................... Cisco Controller
Product Version.................................. 7.2.103.0
Bootloader Version............................... 1.0.1
Field Recovery Image Version..................... 6.0.182.0

(Cisco Controller) >show wlan 2

WLAN Identifier.................................. 2

Radio Policy..................................... 802.11g only

(Cisco Controller) >show client summary

Number of Clients................................ 21

MAC Address AP Name Status WLAN/GLAN/RLAN Auth Protocol Port Wired
----------------- ----------------- ------------- -------------- ---- ---------------- ---- -----

00:1f xx-03 Associated 2 Yes 802.11g 13 No

Would you like to display more entries? (y/n)

(Cisco Controller) >show ap config general xx-03

AP Model......................................... AIR-LAP1141N-E-K9

(Cisco Controller) >show client summary

Number of Clients................................ 22

MAC Address AP Name Status WLAN/GLAN/RLAN Auth Protocol Port Wired
----------------- ----------------- ------------- -------------- ---- ---------------- ---- -----

00:1f AP0007.xxx.xx04 Associated 2 Yes 802.11g 13 No

(Cisco Controller) >show ap config AP0007.xx.xx04

AP Model......................................... AIR-LAP1131AG-E-K9

(Cisco Controller) >show wlan 2

WLAN Identifier.................................. 2

Radio Policy..................................... 802.11a only

(Cisco Controller) >show client summary

Number of Clients................................ 24

MAC Address AP Name Status WLAN/GLAN/RLAN Auth Protocol Port Wired
----------------- ----------------- ------------- -------------- ---- ---------------- ---- -----

00:1f:xx AP0007.xxxx.xx04 Associated 2 Yes 802.11a 13 No

00:40:xx AP0007.xxxx.xx04 Associated 2 Yes 802.11a 13 No

Florian Kelsch · ‎05-30-2012

Osita..

Thank you very much for your effort, really appreciated. I have not been able to do more testing on that site as things have changed a lot and the restriction is not needed any longer.

However, from your results and both our experiences I do think it's a fairly safe assumption that the 1142N has problems with the 7.2.103.0 software.

Cheers,

Thomas

grabonlee · ‎05-31-2012

Thomas,

Before we conclude that there is a problem with 1142 and 7.2.103 software, there might be another logical explanation why some clients show 802.11a protocol instead of the enforced 802.11g protocol on the WLC.

Recall that 1142N is a dual band radio i.e 2.4GHz and 5GHz. Most wireless devices scan the 5.4GHz freq range before scanning the 2.4GHz. 802.11a works on 5GHz while 802.11g works on 2.4GHz. However, both protocols use the same modulation scheme (OFDM) and support the same data rates 6,9,12,18,24,36,48, and 54Mbps.

Bearing the above in mind, apart from frequency difference, 802.11a and 802.11g are basically the same. Hence, I would suggest as a final test that you should disable the 5GHz freq on the 1142N AP and see if the clients shift to 11g protocol. If that works then there is no problem with the 1142N and 7.2.103 WLC.

Cheers

Florian Kelsch · ‎05-31-2012

Osita..

Of course, if I disable the 5GHz antenna, all clients are going to connect with g (well, b/g/n), there's no other choice.. I did that as a workaround, but it naturally had an impact on the desired network structure (for the other WLANs)..

That is where the policy for the radios should have come into play, but was ignored.

Before the software update, things worked for the other thomas. So there must be a connection with the version.. and since your two different WAPs don't show the problem, a compatibility issue between the 7.2.103 software and 1142N WAP seems to be the plausible explanation..

Cheers,

Thomas

Saravanan Lakshmanan · ‎06-03-2012

#Are you using AP group

#Did you recently update the code that triggered this issue.

THOMAS GLASER · ‎06-11-2012

hello

in my case i use ap groups and the problem exists since upgrade from 7.0.98.0 to 7.2.103.0

greetings

tom

Saravanan Lakshmanan · ‎06-12-2012

Can you take off an affected AP from AP group and see that makes a difference. if so then you're hitting

CSCty61970. Move to latest 7.2 that has fix for it.

WLC>show wlan apgroups

Do you see 'none' instead of 'G-only' for Radio policy, if so use the workaround to fix it for now.

http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCty61970

workaround:-

WLC>config wlan apgroup radio-policy 802.11g-only

THOMAS GLASER · ‎06-16-2012

hello

i had to delete and reconfigure all apgroups showing radio policy "ALL"

works fine now

thanks a lot

greetings

tom

tdennehy · ‎10-21-2012

Thomas,

When you had to delete and reconfigure all ap groups showing radio policy of ALL, did you have to take each AP and remove the AP Group from it first?

I am running into this same problem, and it has taken six weeks to get someone to admit there was a problem. Now that I have found your post, I know I'm not crazy!

I was thinking that it might be easier to create a new AP Group with a new name and just move the APs to it. I did move some APs to the default group and then back again, but that did not rectify the issue.

Saravanan Lakshmanan · ‎10-21-2012

This behavior is different for old and new version, since do not know what wlc version you're using try - When you delete the AP group if it warns to remove APs, then yes it expects to remove the APs to different group. If no warning then those APs will be moved to default group and deletes the name.

Issue affects the AP group profile, so bouncing the AP btw groups won't help here.

Florian Kelsch · ‎06-19-2012

I was also using AP Groups.. since then, though the whole network has been changed and the AP Groups have been removed.. also the need to have a radio policy in place has become obsolete..

I believe that your post would have solved my problem then, too..

Thank you very much..

Thomas

Saravanan Lakshmanan · ‎06-18-2012

don't think it is 1140 specific issue.

do you've rf profile configured?

to isolate the confusion, Use one 1142 & other N AP that is not 1142.

Use inssider or netstumbler on A/G capable client and see whether the ssid in question broadcasting or not.

Saravanan Lakshmanan · ‎06-18-2012

1141 is single band g/n, a-radio client can't connect.

1130 might connect client on a-radio since that wlan is mapped to a-radio only which is not the config case with 1142.

njstoops · ‎04-02-2013

I have the exact same problem using the AIR-CT5508-K9 controller (7.3.101.0 version) and 115 LAP1142N AP's. They all report the client protocol using 802.11an even though the radio policy is set to "802.11g only" on the SSID. Anyone have any additional as to why?