WLAN Controller 4400 HA

I have a customer who has 1 x WLAN 4402 Controller. Everything is working perfectly until last week when we add another 4402 to act as HA.
After that, i can no longer ping the management IP of the 1st WLAN controller, nor getting into the web mgmt interface. However, everything on the 2nd new controller works perfectly.
Mgmt IP of 1st 4400: 10.120.16.2
Mgmt IP of 2nd 4400: 10.120.16.4
I have spent a lot of time on this but still couldn't figured out why.
More info on the attached files.
Cheers,
Hunt

Well, the only thing left to do is reset the wlc1 to factory default and configure wlc1 from scratch since your configuration seems okay. Don't try to do a restore, just in case the config is corrupted. I had to do this once and after a week, same thing happened. which was ap's wouldn't join the controller, but I was able to manage the device.

Similar Messages

Problem WLAN controller 4400

There is a WLAN controller 4400 which controls the access points. There is a collapse of all access points from 00:00 to 00:12.
The link is working properly, no problems with the AC, the point is not restarted.
Logging
1. May 24 2010 00:01:08 CAPWAP 3 ECHO_ERR capwap_ac_sm.c:5116 Did not receive heartbeat reply; AP: 00:3a:98:5e:f7:80 *
2. May 24 2010 00:02:38 CAPWAP 3 ECHO_ERR capwap_ac_sm.c:5116 Did not receive heartbeat reply; AP: 00:26:ca:b7:ce:30 *
3. May 24 2010 00:02:49 DOT1X 3 ABORT_AUTH 1x_bauth_sm.c:447 Authentication aborted for client 00:15:70:f1:e4:b4 *
4. May 24 2010 00:03:07 APF 3 INVALID_RADIO_TYPE apf_api.c:27324 Invalid radio type 255 received. *
5. May 24 2010 00:06:50 APF 3 INVALID_RADIO_TYPE apf_api.c:27324 Invalid radio type 255 received. *
6. May 24 2010 00:06:50 APF 3 INVALID_RADIO_TYPE apf_api.c:27337 Invalid radio type 255 received. *
7. May 24 2010 00:06:50 APF 3 INVALID_RADIO_TYPE apf_api.c:27324 Invalid radio type 255 received. *
8. May 24 2010 00:06:50 APF 3 INVALID_RADIO_TYPE apf_api.c:27337 Invalid radio type 255 received. *
9. May 24 2010 00:07:03 APF 3 INVALID_RADIO_TYPE apf_api.c:27324 Invalid radio type 255 received. *
10. May 24 2010 00:07:03 APF 3 INVALID_RADIO_TYPE apf_api.c:27337 Invalid radio type 255 received. *
11. May 24 2010 00:07:10 APF 3 INVALID_RADIO_TYPE apf_api.c:27324 Invalid radio type 255 received. *
12. May 24 2010 00:07:10 APF 3 INVALID_RADIO_TYPE apf_api.c:27337 Invalid radio type 255 received.

If your WLC firmware is 5.X then I would like to recommend you upgrade to 6.X.

WLAN controller 4400 series, use service-port for initial configuration, IP address?

Hi, Everyone,
I just got a new Cisco Wlan controller 4402 from somebody else but I can't find a suitable console cable( DB-9 console on the controller) , I googled everywhere and I read I could use service port to do the initial configuration, the CISCO FAQ says initial IP for service port is 192.168.1.1, I tried use Cross-over cable to connect a PC to the service port directly and use a normal cable with a switch to connect the service port and a PC, both of the connections do not work out: from the PC, I can't ping 192.168.1.1 ( PC IP changed to 192.168.1.20) , nor can I go http://192.168.1.1 . The service port Link is solid GREEN and ACT is solid GREEN, the PC NIC says Connected with 100 Mbps , so I'm wondering the IP address of service port is not 192.168.1.1? Please help.
Any sussgestions and advices are greatly appreciated.

Hi,
plz connect service port to the switch port that should be configured as access.
connect a pc (ip address - as u mentioned) to the other port of the switch. both wlc and pc should be in same vlan (create a temperary vlan).
try https to access the wlc.
Thanks

Basic configuration for a WLAN Controller - 4400

I've been reading over the "Cisco Wireless LAN Controller Configuration Guide, Release 4.0".
So it looks like once you have the HTTPS enabled and the management IP set, the majority of the configuration is through the GUI - clicking your way through all the settings.
I've never used a wireless LAN controller -- so to make this quick and easy, is it possible to make a "quick and dirty cut and paste" CLI template to get it up and running with just minimal settings left to be done?
If so, could you post it? Thanks.

Well, first you will have to console into the wlc and go through the startup wizard. that is your minimum configuration to get it working. No way around this unless you build a script to automatically enter information on the startup wizard.

1510 Mesh A.P with 5508 WLAN Controller

Hi everyone,
I got a situation. We had our wireless mesh network running with 4400 Controller and 1510 A.Ps. Now that we have bought new 5508 Controller (with SW: 7.2) and 3600 Indoor APs, we are unable to add legacy APs on our new controller. After a wild googling I have found that for 1510 APs i need to be on SW ver: 4.0. But that will lead into another situation i-e I wont be able to have my 3600 APs on WLAN Controller.
Any suggessions/wise words will be very very obliged....
Thanks,
Azhar...

You would have to keep those 440's up and have all the WLC in the same mobility group. That is the only way to keep those 1510's up and running. Cusco usually supports mobility between different version but only really as far back as 2 versions. Might work though.
Here is a compatibility guide that explains what devices work with what code.
http://www.cisco.com/en/US/docs/wireless/controller/5500/tech_notes/Wireless_Software_Compatibility_Matrix.html
Sent from Cisco Technical Support iPhone App

WLAN Controller and Location appliance graceful shutdown?

Does anyone know if there is a supported graceful shutdown method/command for the
4400 series WLAN Controller and 2700 Location Appliances?
This weekend our server room will be undergoing maintenance and will experience a total power outage for a 4 hour period. It is our intent to manually bring all equipment down (hopefully in a graceful manner) and then back up once the maintenance is completed. As a result does anyone know if special precaution is needed to shutdown these 2 appliances, or can we simply bring down these devices hard which is the case with most other Cisco equipment?
Thanks in advance

Hi Mark,
Channel 1, 6, and 11 are just about as non-overlapping as 1, 7, and 13. There's an insignificant amount of overlap, so it's just as plausible of a solution, even in Europe. I honestly don't know why you wouldn't use the extra channels to eliminate the minor overlap - every bit helps.
The "channel blanket" or "virtual cell" WLAN design philosophy is rapidly spreading. Cisco maintains that it's a standards violation and I've heard no talk of them purchasing the not-to-be-named company or of them adopting the same design philosophy. I sincerely hope that they do one of the two soon, however, because it's very good design that's difficult for Cisco to compete against.

Migrating WLAN Controller 2125 to 2504

Hello everybody,
I will migrate a Cisco WLAN Controller 2125 to 2504,
So I have one question?
I need to make all configuration into the new Wlan Controller or I can migrate with one tool or something else?
Best Regards

Thanks Scott for your valuable information.
But there are still commands that are available on one platform and not on the other. How will those commands will be migrated of the command itself is not available on the new platform?
For example, if you are using external web authentication, you need to configure this command on 4400 platform:
config custom-web ext-webserver add index IP-address
if you have 5508 platform however, this command is not exist and you need to configure pre-authentication ACL (which is not needed in the first platform if the above command applied).
In such cases if you are migrating from 4400 to 5508 then your external web-auth will not by default work because you need to configure preauth ACL which was not needed in the old platform.
I am not aware about any other thing but there could probably be some other cases like the one I just mentioned.
I think this is why Cisco does not support backup/restore config among different platforms; to avoid such cases.
Amjad

Communication between : AP and WLAN controller

Hi,
The communication between AP and WLAN Controller is ( Data and Control ) UDP.
Source port 1024 and destination port 12222 and 12223. Actually which device listen to which port or both should listen as control and data can be generated from both the devices.
How does the user ( wireless client) traffic is switched - if user traffic is a TCP traffic. It will be sent to WLANC and then WLANC forwards it to respective VLAN or default gateway ( depending upon the destination in the packet ).
Please explain / share the experience.
any link on cisco.com
Thanka in advance
Subodh

"the LWAPP Control and Data messages are encapsulated in UDP packets that are carried over the IP network. The only requirement is established IP connectivity between the access points and the WLC. The LWAPP tunnel uses the access point's IP address and the WLC's AP Manager interface IP address as endpoints. The AP Manager interface is explained in further detail in the
implementation section. On the access point side, both LWAPP Control and Data messages use an ephemeral port that is derived from a hash of the access point MAC address as the UDP port. On the WLC side, LWAPP Data messages always use UDP port 12222. On the WLC side, LWAPP Control messages always use UDP port 12223.
The mechanics and sequencing of Layer 3 LWAPP are similar to Layer 2 LWAPP except that the packets are carried in UDP packets instead of being encapsulated in Ethernet frames."
Taken from "Cisco 440X Series Wireless LAN Controllers Deployment Guide"

AIR-LAP1310G-E-K9 acces point not joining to 5508 wlan controller

Hi,
I have Cisco AIR-LAP1310G-E-K9 access point and 5508 wlan controller with version 7.0.220 and it is joining to the WLAN controller. I have enabled dhcp in the lan controller and i dont have external dns server. How to fix this issue? Can this LAN controller version will support this access point?
My Lan Controller Management IP Address is 10.10.10.5
Please find the below configuration of 1300 access point.
AP001d.4513.dd68#reload
Proceed with reload? [confirm]
%SYS-5-RELOAD: Reload requested by console. Reload Reason: Reload Command.
%LWAPP-5-CHANGED: LWAPP changed state to DOWNXmodem file system is available.
flashfs[0]: 4 files, 2 directories
flashfs[0]: 0 orphaned files, 0 orphaned directories
flashfs[0]: Total bytes: 7741440
flashfs[0]: Bytes used: 2052608
flashfs[0]: Bytes available: 5688832
flashfs[0]: flashfs fsck took 14 seconds.
Base ethernet MAC Address: 00:1d:45:13:dd:68
Initializing ethernet port 0...
Reset ethernet port 0...
Reset done!
ethernet link up, 100 mbps, full-duplex
Ethernet port 0 initialized: link is up
Unable to get our ip address: no "IP_ADDR" variable set
The system has been encountered and error initializing
tftp file system. The system is ignoring the error and
continuing boot. If you interrupt the system boot process,
the following commands will set IP_ADDR, DEFAULT_ROUTER
and NETMASK environment variables, initializing tftp file
system, and finish loading the operating system software:
    set IP_ADDR
    set DEFAULT_ROUTER
    set NETMASK
    tftp_init
    boot
Loading "flash:/c1310-rcvk9w8-mx/c1310-rcvk9w8-mx"...############################################################################################################################################################################################
File "flash:/c1310-rcvk9w8-mx/c1310-rcvk9w8-mx" uncompressed and installed, entry point: 0x3000
executing...
              Restricted Rights Legend
Use, duplication, or disclosure by the Government is
subject to restrictions as set forth in subparagraph
(c) of the Commercial Computer Software - Restricted
Rights clause at FAR sec. 52.227-19 and subparagraph
(c) (1) (ii) of the Rights in Technical Data and Computer
Software clause at DFARS sec. 252.227-7013.
           cisco Systems, Inc.
           170 West Tasman Drive
           San Jose, California 95134-1706
Cisco IOS Software, C1310 Software (C1310-RCVK9W8-M), Version 12.4(10b)JA3, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2008 by Cisco Systems, Inc.
Compiled Wed 19-Mar-08 19:09 by prod_rel_team
Image text-base: 0x00003000, data-base: 0x003BE9E0
Initializing flashfs...
flashfs[1]: 4 files, 2 directories
flashfs[1]: 0 orphaned files, 0 orphaned directories
flashfs[1]: Total bytes: 7741440
flashfs[1]: Bytes used: 2052608
flashfs[1]: Bytes available: 5688832
flashfs[1]: flashfs fsck took 2 seconds.
flashfs[1]: Initialization complete....done Initializing flashfs.
This product contains cryptographic features and is subject to United
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If you require further assistance please contact us by sending email to
[email protected].
cisco AIR-LAP1310G-E-K9R   (PowerPCElvis) processor (revision A0) with 24566K/8192K bytes of memory.
Processor board ID FHK1133E002
PowerPCElvis CPU at 262Mhz, revision number 0x0950
Last reset from reload
LWAPP image version 3.0.51.0
1 FastEthernet interface
32K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address: 00:1D:45:13:DD:68
Part Number                          : 73-8960-09
PCA Assembly Number                  : 800-24963-06
PCA Revision Number                  : A0
PCB Serial Number                    : FOC113000V7
Top Assembly Part Number             : 800-28479-05
Top Assembly Serial Number           : FHK1133E002
Top Revision Number                  : B0
Product/Model Number                 : AIR-LAP1310G-E-K9R
The name for the keys will be: ap.cisco.com
% The key modulus size is 1024 bits
% Generating 1024 bit RSA keys, keys will be non-exportable...[OK]
ip ssh version 2
    ^
% Invalid input detected at '^' marker.
transport input ssh
                 ^
% Invalid input detected at '^' marker.
aaa new-model
^
% Invalid input detected at '^' marker.
aaa authentication login default enable local none
^
% Invalid input detected at '^' marker.
o
^
% Invalid input detected at '^' marker.
Press RETURN to get started!
*Mar 1 00:00:05.442: %LINK-3-UPDOWN: Interface FastEthernet0, changed state to up
*Mar 1 00:00:06.473: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0, changed state to up
*Mar 1 00:00:07.817: %SYS-5-RESTART: System restarted --
Cisco IOS Software, C1310 Software (C1310-RCVK9W8-M), Version 12.4(10b)JA3, RELEASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2008 by Cisco Systems, Inc.
Compiled Wed 19-Mar-08 19:09 by prod_rel_team
Translating "CISCO-LWAPP-CONTROLLER"...domain server (255.255.255.255)
transport input ssh
                 ^
% Invalid input detected at '^' marker.
*Mar 1 00:00:33.860: %LWAPP-3-CLIENTEVENTLOG: Performing DNS resolution for CISCO-LWAPP-CONTROLLER
*Mar 1 00:00:33.860: %LWAPP-3-CLIENTERRORLOG: DNS Name Lookup: could not resolve CISCO-LWAPP-CONTROLLER
*Mar 1 00:00:33.861: %LWAPP-5-CHANGED: LWAPP changed state to DISCOVERY
logging origin-id string AP:001d.4513.dd68
         ^
% Invalid input detected at '^' marker.
logging 255.255.255.255
        ^
% Invalid input detected at '^' marker.
logging trap 3
        ^
% Invalid input detected at '^' marker.
*Mar 1 00:00:37.440: Logging LWAPP message to 255.255.255.255.
AP001d.4513.dd68>
%LWAPP-3-CLIENTEVENTLOG: Forcing AP to obtain IP address using DHCP
%DHCP-6-ADDRESS_ASSIGN: Interface FastEthernet0 assigned DHCP address 10.10.10.46, mask 255.255.255.0, hostname AP001d.4513.dd68
Translating "CISCO-LWAPP-CONTROLLER.CISCO-LWAPP-CONTROLLER.mydomain.com"...domain server (10.10.10.5)
%LWAPP-3-CLIENTEVENTLOG: Did not get vendor specific options from DHCP.
%LWAPP-3-CLIENTEVENTLOG: Did not get log server settings from DHCP.
%LWAPP-3-CLIENTEVENTLOG: Performing DNS resolution for CISCO-LWAPP-CONTROLLER.CISCO-LWAPP-CONTROLLER.mydomain.com
%LWAPP-3-CLIENTERRORLOG: DNS Name Lookup: could not resolve CISCO-LWAPP-CONTROLLER.CISCO-LWAPP-CONTROLLER.mydomain.com
AP001d.4513.dd68>

Your debug is very telling ..
AP001d.4513.dd68>
%LWAPP-3-CLIENTEVENTLOG: Forcing AP to obtain IP address using DHCP
%DHCP-6-ADDRESS_ASSIGN: Interface FastEthernet0 assigned DHCP address 10.10.10.46, mask 255.255.255.0, hostname AP001d.4513.dd68
Translating "CISCO-LWAPP-CONTROLLER.CISCO-LWAPP-CONTROLLER.mydomain.com"...domain server (10.10.10.5)
%LWAPP-3-CLIENTEVENTLOG: Did not get vendor specific options from DHCP.
%LWAPP-3-CLIENTEVENTLOG: Did not get log server settings from DHCP.
%LWAPP-3-CLIENTEVENTLOG: Performing DNS resolution for CISCO-LWAPP-CONTROLLER.CISCO-LWAPP-CONTROLLER.mydomain.com
%LWAPP-3-CLIENTERRORLOG: DNS Name Lookup: could not resolve CISCO-LWAPP-CONTROLLER.CISCO-LWAPP-CONTROLLER.mydomain.com
AP001d.4513.dd68>
What are you using to tell the AP where the contoller lives ? Since you are consoled into the ap you can use the -> capwap ap controller ip address
This will point the ap to your controller
"Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin
‎"I'm in a serious relationship with my Wi-Fi. You could say we have a connection."

How can I copy a PSK from one WLAN Controller to another

I'm trying to replace a WLAN controller with a new one. One WLAN is configured with WPA-PSK. Nobody seems to know the key that was used.
Anyone know if there is a way to extract the encrypted key out of a controller and put it into the new WLAN Controller?
Thanks in advance.

No can do ...
https://supportforums.cisco.com/discussion/11364566/view-psks-wlans-wlc
However, if any users are on a MAC Book and has iCloud enabled you can see the key under the "keys". If you have a windows 7 box and uses the native supplicant you can expose the key on the supplicant ..

WAP4410N Access point and 4404 WLAN Controller.

Hello to all,
I am planning to setup a new WLAN using WAP4410N Wireless N Access Point. Is it possible to manage the AP using 4404 WLAN controller ?
I need to buy arround 42 AP for covering the entire building.
Regards,
Aslam

leolaohoo
Could u please tell me which series can be used with 4404 WLANC ?
Also the AP Should support Bridging or Mesh.

Can Wlan Controller work with Third party Aps

Can Cisco Wlan Controller work for 3rd party Aps which does not have LWAPP running. If yes How.If no then how we can manage existing Ap's of say 3com in the network...

Hi Friend,
No, Cisco WLC will not support any third party APs. Even if Cisco APs are not lwapp AP then WLC will not be able to manage them.
We need to have Cisco Lwapp APs only for wireless lan controller to manage them.
For 3com Aps you need to talk to 3com guys or any third party tool if available to manage these APs.
HTH
Ankur

Cisco LWAP & WLAN Controller Flexconnect Across HP Switches

Hello All, I'm looking for a little guidance in making the needed routing and switching configuration changes on our Corporate Network to accomadate flex connect functionality for Cisco Lightweight Access Points (LWAPs). The LWAPs that are currently configured on our network only work when our WLAN Controller is up and running and I need for them to be disconnectable so that we can move the WLAN Controller to our virtual co-lo. It should be known that I inhereted this network from the previous admin and have been working hard to map everything out to the best of my ability. Also, the WLAN controller is already operating in our production network so it limits my ability to do much testing.
Just FYI, I'm a new Systems Admin promoted from a Desktop Support role and have my CCENT (Currently working on CCNA & MCITP Server Admin) so I have some knowledge but it is limited on the networking and switching side of things. Unfortunately, the Senior Systems Admin has even less knowledge of networking than me and I don't really have anyone to turn to which is why I'm posting here. I would have utilized GNS to help me simulate the configuration however there are HP switches in the mix and no means of emulating them.
-Relevant Device List-
(CONSA251) Sonicwall NSA 240 - 10.1.1.251
Interface Information
Interface    IP Address    Description
X0 -> LAN
10.1.1.251   LAN Interface
X1 -> WAN
*************   Time Warner WAN
X2 -> DMZ
*************   DMZ Interface
X3 -> WAN
*************   Sprint WAN
X0-V20 -> LAN
10.1.101.1   Corporate WLAN
X0-V30 -> LAN
192.168.1.1   Guest WLAN
(CORT250) Cisco 3845 - 10.1.1.250
(CO-WLAN-CTRLER) Cisco 5508 Wireless Controller - 10.1.1.2
(COSW240) HP Procurve 4108GL - 10.1.1.240
(COSW238) HP Procurve 2510B-24 - 10.1.20.238
(CORP-AP-MIS) AIR-LAP1131AG-A-K9 - 10.1.1.79
(COSW239) HP1810G-24 - No IP (Inaccesible but being replaced)
I will now go on to explain our network topology as it pertains to the WAPs and WLAN Controller and how I believe it needs to be configured in order to operate from my perspective.
Our Corporate and Guest Wireless Access is provided via the Sonicwall CONSA251 through a connection from the X0 interface to HP Switch COSW239 which is then connected to WLAN Controller CO-WLAN-CTRLER as detailed below:
Device - Interface Name/Port
CONSA251 - X0
COSW239 - 2
COSW239 - 18,19
CO-WLAN-CTRLER - 2,3
The WLAN Controller currently communicates with all the LWAPs via Layer 3 TCP\IP as I understand it and then routes all DHCP requests and traffic destine for the 10.1.101.1 (corporate WLAN) and 192.168.1.1 (Guest WLAN) to the Sonicwall and vice versa.
Now what I am trying to do is VLAN the LWAP CORP-AP-MIS across the HP Switches to the X0 interface on the Sonicwall NSA240 where it will be able to route traffic via VLAN 20 & 30. The problem lies in my inexperience with HP VLAN configurations and how the ports need to be configured on each device so it can route traffic to the Sonicwall when the WLAN Controller is shutdown.
The LWAP CORP-AP-MIS layer 2 trace to the WLAN Controller is as shown below:
Device - Interface Name/Port
CORP-AP-MIS - FA/0
COSW238     - 16
COSW238     - 25
COSW240     - B4
COSW240     - H6
CORT250     - GigabitEthernet0/0
CORT250     - Se1/0
CONSA251    - X0
Now for all intesive purposes the Corporate Router CORT250 should probably be handling the routing for our Corporate and Guest Wireless network however that was not the way it was originally setup and I have to work with what was inhereted. The Corporate Router CORT250 has a default route to the Sonicwall and the Sonicwall CONSA251 has all the routing already in place for the Corporate & Guest WLANs.
What I would like to do is VLAN off the X0-V20&V30 accross multiple switches and switchports to each LWAP in our building. I do have the LWAP I'm testing on configured with Flex Connect which I understand is required for it to be disconnectable.
Any guidance on how I would go about configuring this accross devices would be appreciated. I know there are some difference between HP and Cisco Switching terms and how tagging, untagging, and trunking works however I lack the experience to apply this in practice especially in a production environment.
I will be happy to provide any additional information or clarification that is needed. Thank you in advance for the help.

Just to add about the ISE... you can profile, but having only one ssid might or might not work in your situation. Also if you end up with remote sites or ap's in h-reap mode, currently ISE cant do any profiling. If you go with the 7500 or 5508/WiSM2, they don't really do an active-active or active backup. They are both up and you can split the load or put all ap's on one, its up to you. I usually split the load just to make sure both are working. I don't want to all of a sudden loose the primary and then find out my secondary/backup is not working.

I need to bridge a printer off a wireless bridge using a 4402 WLAN Controller

I need to bridge a printer off a wireless bridge using a 4402 WLAN Controller. Would I need to make any changes on the 4402 WLAN Controller?

One options is to take a cisco autonmous access point and configure it as a WGB. And no, you would not have to do anything special to the WLC in thay deisgn. The WGB would act as a wireless client.
Make sense?

Data flow using a WLAN controller

Can someone explain the flow of data from wireless client to some destination in the internal network (or the Internet) using a WLAN Controller? Use a 4402 as an example.
Specifically, I am wondering if client traffic actually passes thru the WLAN Controller (4402). I am reading the configuration guide and it doesn't seem to be explicitly stated one way or the other.

Hi Ken,
This is a very common question these days.
Here is a recent thread as well as an excerpt from a good doc:
http://forum.cisco.com/eforum/servlet/NetProf?page=netprof&forum=Wireless%20-%20Mobility&topic=Getting%20Started%20with%20Wireless&CommCmd=MB%3Fcmd%3Ddisplay_location%26location%3D.1ddaca5d
In the Cisco Centralized WLAN architecture, LWAPP-enabled access points operate in the lightweight mode (as opposed to the autonomous mode). The access points associate to a Cisco WLAN controller. The controller manages the configuration, firmware, and control transactions such as 802.1x authentication. In addition, all wireless traffic is tunneled through the controller.
LWAPP is an IETF draft protocol that defines the control messaging for setup and path authentication and run-time operations. LWAPP also defines the tunneling mechanism for data traffic.
In an LWAPP environment, a Cisco Aironet LWAPP-enabled access point discovers a controller by using LWAPP discovery mechanisms and then sends it an LWAPP join request. The controller sends the access point an LWAPP join response allowing the access point to join the controller. When the access point is joined, the controller downloads its software if the versions on the access point and controller do not match.
LWAPP secures the control communication between the access point and controller by means of a secure key distribution, utilizing X.509 certificates on both the access point and controller.
From this doc:
http://www.cisco.com/en/US/products/hw/wireless/ps430/products_quick_start09186a00805100f5.html#wp47092
Hope this helps!
Rob
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WLAN Controller 4400 HA

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