Microsoft DHCP Server - Option 43 Setup

Answered Question
Nov 1st, 2007

I have the scope configured properly as far as the 241 Option with Option 43 and the VCI in it for both the 1130 and 1200 series AP's. However, how do you make this work if your subnet has both 1200 and 1130's in it? Basically if I have two 241 options set, the 1130 comes in first allowing hte 1130's to associate, but not the 1200's. If I remove the 1130 Option 241, the 1200's associate. Basically, how do I get both to work from the scope correctly?

Thanks,

Raun

I have this problem too.
0 votes
Correct Answer by rob.huffman about 9 years 1 month ago

Hi Raun,

Here is some additional info;

This section contains a DHCP Option 43 configuration example on a Windows 2003 Enterprise DHCP server for use with lightweight access points. For other DHCP server implementations, consult the DHCP server documentation for configuring DHCP Option 43. In Option 43, you should use the IP address of the controller management interface.

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****Note DHCP Option 43 is limited to one access point type per DHCP pool. You must configure a separate DHCP pool for each access point type.****

From this doc;

http://www.cisco.com/en/US/docs/wireless/access_point/1200/installation/guide/120h_g.html

DHCP OPTION 43 for Lightweight Cisco Aironet Access Points Configuration Example

http://www.cisco.com/en/US/tech/tk722/tk809/technologies_configuration_example09186a00808714fe.shtml#t1

Hope this helps!

Rob

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Correct Answer
rob.huffman Thu, 11/01/2007 - 07:17

Hi Raun,

Here is some additional info;

This section contains a DHCP Option 43 configuration example on a Windows 2003 Enterprise DHCP server for use with lightweight access points. For other DHCP server implementations, consult the DHCP server documentation for configuring DHCP Option 43. In Option 43, you should use the IP address of the controller management interface.

--------------------------------------------------------------------------------

****Note DHCP Option 43 is limited to one access point type per DHCP pool. You must configure a separate DHCP pool for each access point type.****

From this doc;

http://www.cisco.com/en/US/docs/wireless/access_point/1200/installation/guide/120h_g.html

DHCP OPTION 43 for Lightweight Cisco Aironet Access Points Configuration Example

http://www.cisco.com/en/US/tech/tk722/tk809/technologies_configuration_example09186a00808714fe.shtml#t1

Hope this helps!

Rob

raun.williams Thu, 11/01/2007 - 07:20

Rob, I figured that would be the case but not the answer I wanted. Thank you for confirming it for me though!

Raun

rob.huffman Thu, 11/01/2007 - 10:37

Sorry Raun,

I always hate being the bearer of bad news :( But I thought that this info may save you some grey hairs.

Take care,

Rob

I seem to remember a workaround for this where the VCI string was shortened to "Cisco AP" which resulted in a matched by either model LWAP.

Also, as an aside, we have had pretty good success using the DNS approach CISCO-LWAPP-CONTROLLER.localdomain to point the LWAPs to one of the controllers in the mobility group.

This works great - assuming that you have setup your mobility group tables in each of your controllers with an entry for every controller in the mobility group.

Hope this helps,

- John

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