Wireless clients not showing 802.11n speeds

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Mar 12th, 2009
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We are using this AP, AIR-LAP1142N-A-K9 and WLCs at v5.2.157.0. We use WPA2 w/AES and TKIP. We never see more than a 54 Mbps link. Even within a few feet of the AP. We had an Aruba controller and the same clients reported 270 Mbps. Is there an issue with this system not doing 802.11n speeds?

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Overall Rating: 2 (2 ratings)
jeff.kish Thu, 03/12/2009 - 14:59
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Do you have 802.11n enabled? Click on the Wireless tab in the GUI, then use the links on the left to navigate to the 802.11b/g/n and 802.11a/n network pages. Make sure the 802.11n option is checked on these pages.

glenn.newman Thu, 03/12/2009 - 15:07
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Yes that option is checked. I am just noticing that the highest stated speed that can be configured as "supported" is 144.

jeff.kish Fri, 03/13/2009 - 05:49
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I don't believe Cisco supports channel-bonding in the 2.4GHz space, so that might be why the maximum speed is 144Mbps rather than 300Mbps. Does the 5GHz list 300Mbps as a possible speed?

Did the document work for you, or are you still stuck with slow speeds?

grzegorz.ciolek Fri, 03/13/2009 - 13:18
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801.11n supports only AES. Also make sure that WMM for target WLAN is set at least to "optional".


glenn.newman Fri, 03/13/2009 - 13:26
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I got this working, the network utility shows 270 and the WL:C shows me as an "N" connection. WMM is on default of "allowed". My MAC laptop doesn't let me select a/b/g so this SSID is for A network only. This SSID is WPA2, AES only.

config 802.11a disable

config 802.11a 11nsupport enable

config 802.11a 11nSupport a-mpdu tx priority all enable (We are not using QoS)

config 802.11a 11nSupport mcs tx 15 enable

save config

config 802.11a enable

save config

It seemed that I had to reboot the WLCs to get N to work.


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