WLC 4002 Setup questions

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Jul 30th, 2008
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Can you please advise.

I will be required to setup a 2xWLC 4002 for use with several 1131 LAP connecting via a 3750 stack. what would be the recommended setup for the LWAPP? would it be best to use layer2 (boh the ap manager interface in the same vlan as the AP's) or layer 3 (use option 43 and point it to the AP manager int).


Thank you in advance

Dean.

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Rob Huffman Wed, 07/30/2008 - 09:03
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Hi Dean,


You will need to use Layer 3 :)


Just a note to explain;


Q. My 1131 lightweight access point (LAP) does not register with my 4402 Wireless LAN Controller (WLC). What can be the possible reason for this?


A. One common reason is that the Lightweight Access Point Protocol (LWAPP) Transport Mode is configured on the WLC. A 4402 WLC can operate in both Layer 2 and Layer 3 LWAPP mode. Whereas, an 1131 LAP can only operate in Layer 3 mode. Layer 2 mode is not supported on the 1131 LAP. So, if the WLC is configured with the LWAPP Transport Mode of Layer 2, then your LAP does not join the WLC. In order to overcome this problem, change the LWAPP Transport Mode of the WLC from Layer 2 to Layer 3.


In order to change the LWAPP Transport Mode using the GUI, go to the WLC page and locate the second selection in the main field which is LWAPP Transport Mode. Change this to Layer 3 and reboot the controller. Now, your LAP is able to register with the controller.



From this good Q&A doc;


http://www.cisco.com/en/US/products/ps6366/products_qanda_item09186a008064a991.shtml


Hope this helps!

Rob


deanhoy Sat, 08/02/2008 - 05:08
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thank you Rob for this. Can you give me any advice on the dhcp setup for the AP. Do i need to use both option 43 & 60?


Regards

Dean.

Rob Huffman Sat, 08/02/2008 - 06:26
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Hi Dean,


You are most welcome my friend :) You can either use Option 43/60 in DHCP or DNS resolution (or Prime the AP) to allow for LWAPP registration to the WLC;


Wireless LAN Controller and Lightweight Access Point Basic Configuration Example


http://www.cisco.com/en/US/products/ps6366/products_configuration_example09186a0080665cdf.shtml



Lightweight AP (LAP) Registration to a Wireless LAN Controller (WLC)


http://www.cisco.com/en/US/tech/tk722/tk809/technologies_tech_note09186a00806c9e51.shtml



Configuring DHCP Option 43


http://www.cisco.com/en/US/docs/wireless/access_point/1500/installation/guide/1500_axg.html


Hope this helps!

Rob

deanhoy Sat, 08/02/2008 - 07:58
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do i only need to configure option 43 within the dhcp scope with the ip address of the AP management interface for the AP to register with the WLC? some papers talk about option 60 also. Is option 60 required?


Thank you again


Dean.

Rob Huffman Sat, 08/02/2008 - 09:16
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Hi Dean,


Yes, if you are using Option 43 you will also require Option 60 :)


Hope this helps!

Rob

deanhoy Sun, 08/03/2008 - 00:08
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Thank you Rob

So if i were to use the following dhcp config, would all the 1131 ap's connect to the WLC?


ip dhcp pool AP1131_DHCP_POOL

network 192.168.10.0 255.255.255.0

default-router 192.168.10.1

dns-server 192.168.8.1

option 60 ascii "Cisco AP c1131"

option 43 ascii "192.168.1.1"


Thank you for all your time and assistance with this!


Dean.


Tiago Antunes Tue, 10/19/2010 - 00:28
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Hi Dean,


I am sory to say but this DHCP pool config will not work...

option 43 ascii "192.168.1.1" is not supported in 1131 APs.


You have to configure option 43 in hex format. Example for IP address 192.168.1.1, you would need to enter the hex format:


!

ip dhcp pool AP1131_DHCP_POOL

     network 192.168.10.0 255.255.255.0

     default-router 192.168.10.1

     dns-server 192.168.8.1

     option 43 hex f104.c0a8.0101
!


You just need to make sure that IP 192.168.1.1 is the management ip address of the WLC and that the AP can reach this DHCP pool.


Just for your information about option 43 in hex format:

f1--> to indicate it is going to be the management IP (convention)
f1xx --> xx are the number of bytes that will follow. This is when you want to provide 1,2, or 3 IP addresses of 3 diferent WLCs so the AP can try all of them. Example:


f104.0a30.4c44 -> 0a30.4c44 = 4 bytes
f108.0a30.4c44.0a30.4c -> 0a30.4c44.0a30.4c = 8bytes
f10c.0a30.4c44.0a30.4c.0a30.4c46 -> 0a30.4c44.0a30.4c.0a30.4c46 = 12 bytes


Regarding option 60, it is not needed. Option 60 is needed if you want to use diferent dhcp pools for each AP model, which i don't believe is your case.


HTH,

Tiago


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ashirel Mon, 10/18/2010 - 11:28
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is it still the case that the 1131 ap operates only in layer 3 mode?

i was under the impression that in current firmware versions (v5.1.x) the 1131 can also operate at layer 2.

true or false?

tnx

ams

Nicolas Darchis Mon, 10/18/2010 - 23:43
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Hi,


big big confusion here.

LWAPP layer 2 = lwapp over ethernet frames. Not supported after 5.2

LWAPP layer 3 = lwapp over udp packets. The way everyone should be using.


What you seemed to say is "do I put everything in the same vlan". This has nothing to do with the above.

Regardless of version you can put the aps in a different vlan than the ap manager or not and have the mangement in a different vlan or not. It's totally up to you.


Hope this clarifies,

Nicolas

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