AP discovery method document

Answered Question
Aug 13th, 2012
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Hello expers,


With the Cisco controller based wireless designs we could use the DHCP option 43 or the DNS method for AP discovery.

How do you decide which one to use? I'm after latest Cisco ducmentation which either specify one over the other as best practise or provide a compairson of the  two discovery methods.


Thanks,

Silva

Correct Answer by fbarboza about 5 years 2 days ago

Hi ,


Here is the link that explains how to get option 43 configured.

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


Here is the link that explains how to get DNS option configured.

http://www.cisco.com/en/US/products/ps6366/products_tech_note09186a00809d5097.shtml



Now which one to use would be a designe call on what option works best for you.

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Stephen Rodriguez Mon, 08/13/2012 - 17:51
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either one works, and works well.  It all depends on the particualr setup of the network.


I've seen customers that do not break up DNS based on regoion, so cisco-capwap-controller.example.com wouldn't work, as they would only have the one entry for the WLC in the HQ.  and they wanted to keep everything seperate i.e. no mobility outside the region.


if you had subdomais, cisco-capwap-controller.east.example.com (east coast) and cisco-capwap-controller.west.example.com ( west coast), it works better.



Option 43 is a bit more flexible, as you can do that per scope, and set a different WLC per scope, and per AP type.



HTH,
Steve

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jaysilva6 Mon, 08/13/2012 - 20:43
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Hi Steve,


Thanks for the input.

You mentioned  "I've seen customers that do not break up DNS based on regoion, so  cisco-capwap-controller.example.com wouldn't work, as they would only  have the one entry for the WLC in the HQ. "


Suppose we  have n number of controllers in HQ and all belong to the same region.

Is it possible to use a single DNS entry along with aliases for the remaining n-1 controllers?

Something like a 1 : many mapping at the DNS level.

Thanks,

Silva

Correct Answer
fbarboza Wed, 08/15/2012 - 09:40
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Hi ,


Here is the link that explains how to get option 43 configured.

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


Here is the link that explains how to get DNS option configured.

http://www.cisco.com/en/US/products/ps6366/products_tech_note09186a00809d5097.shtml



Now which one to use would be a designe call on what option works best for you.

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