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Cisco wireless access point not connecting to controler

Posted on 2011-10-31
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I was given three AIR-LAP1242AG-A-K9 Cisco wireless access points that had previously been used at another site.  I was told to connect them to a Cisco 4402 Wireless LAN Controller.  I reset all three APs back to their default configurations and plugged them into the network.  Two of the APs appeared in the controller's Wireless APs list.  One of the APs did not appear in the list.  I verified the non-connected AP received a valid IP address through DHCP and I was able to ping the AP through the controller's web interface.  I unplugged a connected AP and replaced it with the non-connected AP (using the same cable and port).  It did not fix the problem.

Any ideas?
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Question by:David XF
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Expert Comment

by:rochey2009
ID: 37059100
Hi,

Please post the output

debug lwapp events enable

at the controller CLI

when the failing AP attempts to join.


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Author Comment

by:David XF
ID: 37059342
I started the debug on the controller and then reset the AP (disconnected the POE and reconnected).  All I received in the debug were" Successful transmission of LWAPP Echo-Response to AP..." in the logs.  No errors.  I did not see the MAC address for the disconnected AP.
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Expert Comment

by:rochey2009
ID: 37059373
Are they on the same subnet? If not how does the AP get the IP of the WLC? Are you using DHCP option 43?
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Author Comment

by:David XF
ID: 37060005
All three APs, both connected and non-connected, are on the same subnet.  I haven't made any changes to the AP configuration.  Once the APs received IP addresses through DHCP, they appeared in the Wireless APs list on the WLC.  Except, of course, for the one AP that won't show up in the list.
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Author Comment

by:David XF
ID: 37060008
I also tried changing the IP address of the non-connected AP to a static IP address that is one number off from a connected AP.  Did not fix the problem.
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Expert Comment

by:rochey2009
ID: 37060071

Ok. Put the static IP address back onto the LAP but also give it the ip address of the WLC with the following command:

lwapp controller ip address ip-address-of-wlc
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Author Comment

by:David XF
ID: 37062979
I ran the command and received the following error:

ap> lwapp controller ip address x.x.x.x
        ^
% Invalid input detected at '^' marker.


One thing I noticed  - when I connect to a connected AP using the Console and run the Show Version command, it shows "LWAPPimage 4.2.176.0".  When I run the Show Version command for the non-connected AP, it doesn't have any LWAPPimage listed.  Could it be possible (taking a wild guess here) that this AP is setup for autonomous configuration instead of lightweight?  I've confirmed that the model number is AIR-LAP1242AG and I reset the AP back to it's default settings again last night.
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Expert Comment

by:rochey2009
ID: 37064785
Sorry command should have been

lwapp ap controller ip address
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Author Comment

by:David XF
ID: 37066184
Same error message.

ap> lwapp ap controller ip address x.x.x.x
        ^
% Invalid input detected at '^' marker.
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Expert Comment

by:rochey2009
ID: 37072564
please post the output from show version
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Author Comment

by:David XF
ID: 37073348
Here is the Show Version output for the non-connected AP:

ap>show version
Cisco IOS Software, C1240 Software (C1240-K9W7-M), Version 12.4(10b)JDA, RELEASE
 SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2008 by Cisco Systems, Inc.
Compiled Thu 30-Oct-08 11:59 by prod_rel_team

ROM: Bootstrap program is C1240 boot loader
BOOTLDR: C1240 Boot Loader (C1240-BOOT-M) Version 12.3(7)JA1, RELEASE SOFTWARE (
fc1)

ap uptime is 1 day, 8 hours, 32 minutes
System returned to ROM by power-on
System restarted at 06:13:39 -0700 Tue Nov 1 2011
System image file is "flash:/c1240-k9w7-mx.124-10b.JDA/c1240-k9w7-mx.124-10b.JDA
"

cisco AIR-LAP1242AG-A-K9   (PowerPCElvis) processor (revision A0) with 24566K/81
92K bytes of memory.
Processor board ID FTX1105B4FL
PowerPCElvis CPU at 262Mhz, revision number 0x0950
Last reset from power-on
1 FastEthernet interface
2 802.11 Radio(s)

32K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address: 00:1A:A2:A6:C4:04
Part Number                          : 73-9925-05
PCA Assembly Number                  : 800-26579-04
PCA Revision Number                  : B0
PCB Serial Number                    : FOC11013XF4
Top Assembly Part Number             : 800-26804-02
Top Assembly Serial Number           : FTX1105B4FL
Top Revision Number                  : B0
Product/Model Number                 : AIR-LAP1242AG-A-K9

Configuration register is 0xF




Here is the Show Version output for a connected AP:
WCR_Tech_Room>show version
Cisco IOS Software, C1240 Software (C1240-K9W8-M), Version 12.4(10b)JDA1, RELEAS
E SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2008 by Cisco Systems, Inc.
Compiled Thu 20-Nov-08 17:33 by prod_rel_team

ROM: Bootstrap program is C1240 boot loader
BOOTLDR: C1240 Boot Loader (C1240-BOOT-M) Version 12.3(7)JA1, RELEASE SOFTWARE (
fc1)

WCR_Tech_Room uptime is 13 minutes
System returned to ROM by power-on
System image file is "flash:/c1240-k9w8-mx.124-10b.JDA1/c1240-k9w8-mx.124-10b.JD
A1"


cisco AIR-LAP1242AG-A-K9   (PowerPCElvis) processor (revision A0) with 24566K/81
92K bytes of memory.
Processor board ID FTX1150B4JB
PowerPCElvis CPU at 262Mhz, revision number 0x0950
Last reset from power-on
LWAPP image version 4.2.176.0
1 FastEthernet interface
2 802.11 Radio(s)

32K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address: 00:1D:A1:FC:31:E8
Part Number                          : 73-9925-06
PCA Assembly Number                  : 800-26579-05
PCA Revision Number                  : A0
PCB Serial Number                    : FOC11487EDM
Top Assembly Part Number             : 800-29151-02
Top Assembly Serial Number           : FTX1150B4JB
Top Revision Number                  : A0
Product/Model Number                 : AIR-LAP1242AG-A-K9

Configuration register is 0xF



Besides the connected AP having "LWAPP image version 4.2.176.0" while the non-connected does not, I also noticed that the Cisco IOS Software versions are different - "C1240 Software (C1240-K9W8-M), Version 12.4(10b)JDA1" vs "C1240 Software (C1240-K9W7-M), Version 12.4(10b)JDA".
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Accepted Solution

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rochey2009 earned 2000 total points
ID: 37073717
Yes your image k9w7 is autonomous IOS

k9w7- autonomous IOS
k9w8- lightweight IOS

http://www.cisco.com/en/US/docs/wireless/access_point/conversion/lwapp/upgrade/guide/lwapnote.html
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Author Comment

by:David XF
ID: 37093888
I got pulled away for another project last week.  I should be able to try this today.  Thanks.
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Author Comment

by:David XF
ID: 37107354
I upgraded the AP and it is now showing on the controller.  Thanks for all your help.
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Expert Comment

by:rochey2009
ID: 37111293
Your welcome.
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