Spectralink and Vocera not associating to 1142n

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Apr 15th, 2009
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I have been demoing one of the 1142n radios and have come up with a few problems. I can't seem to figure out why our Vocera badges and Spectralink handsets aren't able to associate to the AP. The Vocera badge is a B2000 and the Spectralink handset is an i640. I've compared settings from one controller to another, and other than different versions, they are exactly the same. The main controllers have 5.1.151.0 and my test controller had the new 5.2.178.0 version. Any ideas?

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George Stefanick Wed, 04/15/2009 - 12:36
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Are you able to get other devices associated to the 1142?

ericwoodin Wed, 04/15/2009 - 15:27
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Yes, I've gotten laptops and PDAs working on the same SSIDs. I can take the same Vocera badges and Spectralink phones to another area on our older 1242 a/b/g radios with all the same SSIDs and they work fine. I've contacted Vocera and they do not recommend using Cisco 1142n radios. The Vocera badges do work with our Aruba 802.11n radios though.

Leo Laohoo Wed, 04/15/2009 - 15:48
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Have you tried going through this documentatin:


Vocera IP Phone Deployment in Cisco Unified Wireless Network Infrastructure

http://www.cisco.com/en/US/tech/tk722/tk809/technologies_configuration_example09186a0080766d54.shtml


Voice over WLAN Vocera Implementation

http://www.cisco.com/en/US/docs/solutions/Enterprise/Mobility/vowlan/41dg/vowlan_ch11.html

ericwoodin Wed, 04/15/2009 - 16:10
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We followed both of those documents for a dense voice grade wireless network with our existing 1242 and 1230 APs. I moved one of our working 1242 a/b/g radios over to the same test controller that has the 1142n radios and the Vocera badges connected fine. I've tripled checked all the switchport, controller, and AP settings and compared them to the working 1242 and they are the same.

Robert.N.Barrett_2 Wed, 04/15/2009 - 19:36
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I know this defeats the whole point, but have you tried disabling all of the 802.11n features (including the multiple radios/antennas)? This isn't a very scientific approach (checking out the logs as recommended earlier is the best approach), but I'm struggling to look for the differences.

ericwoodin Tue, 04/21/2009 - 12:01
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I dumbed down both of our demo APs with only the b/g working on two antenna and Vocera still would not associate. I got the Spectralink working though on a different WLAN.

Leo Laohoo Wed, 04/15/2009 - 17:54
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Hi Eric,

This is news to me. So let me get what you are saying ...


Vocera badges and Spectralink handset is able to join 1230/1240 LAP's but when they won't be able to join 1140? How about the 1250?


In the 1140, what error messages do you see when the clients try to join?

Darren Ramsey Thu, 04/16/2009 - 17:17
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Have seen the same with Vocera and the 1250 running 4.2.176. Vocera works fine on the 1242 and fails to associate to the 1250. Both AP are on the same controller and all other devices work ok. HT mode (11N) is on for A and off for B. We opened a TAC case but I'm not sure of the latest status. I'll ask one of my guys and report back.

dennischolmes Fri, 04/17/2009 - 03:30
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Do me a favor. First, put the controllers on the same version of code. You may be running into a CAPWAP/LWAPP conflict issue. CAPWAP uses a different method of encryption for the control data (dtls) than the LWAPP control (AES). Having said this I'm not sure how the QoS markings and security encryption for the devices would then react when coming into the network from two different encrypted tunnels. 5.1 is lwapp and 5.2 is capwap.

ericwoodin Tue, 04/21/2009 - 12:27
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I just upgraded both controller to the newest version of code 5.2.178.0. We still cannot get the Vocera bage to associate. The Spectralink phone associated on a different WLAN.

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