Configure standalone 1250 AP to support 802.11n

Unanswered Question

Been searching this forum about 802.11n setup.  So far, I learned (from this forum) that to support 802.11n, I must use WPA2/AES (or open auth), and I need to ensure WMM is enable.


Q-1.  Besides the above two, are there any other requirement I need to address in my configuration?

Q-2.  Do I have to enable both 2.4Mhz and 5Mhz radio for 802.11n performance?

Q-3.  Is there WPA2/TKIP option?  If so, would this option support 802.11n?  Or, it has to be WPA2/AES?

Q-4.  From the command line, how can I verify if I have WMM enable?


I have read the 1250 AP Configuration guide, but I don't see specific discussion/chapter about 802.11n.  If there is any good reading I can do, please let me know.


Thanks.

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Scott Fella Thu, 03/25/2010 - 20:46
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I will try to answer your questions:)


Q-1.  Besides the above two, are there any other requirement I need to address in my configuration?

You need to configure 40mhz channel width in the AP 802.11a radio

Q-2.  Do I have to enable both 2.4Mhz and 5Mhz radio for 802.11n performance?

Only enable 'N' on the 5ghz side due to only having 3 non-overlapping channels on the 2.4ghz

Q-3.  Is there WPA2/TKIP option?  If so, would this option support 802.11n?  Or, it has to be WPA2/AES?

AES is the supported encryption standard for 802.11N.... not TKIP.  WPA2/AES or OPEN is your only option

Q-4.  From the command line, how can I verify if I have WMM enable?

show wlan


Issue the config wlan wmm {disabled | allowed | required} wlan-id command in order to enable WMM mode

Peter Nugent Sat, 03/27/2010 - 10:52
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You dont need to configure 40MHz channels for N, just use AES and WMM

should be good to go, you can run it

in 2.4 and 5/) GHz but only channel bond the 5.0GHz as Sc

oott says there are not enough channels to bond in the 2.4GHz spectrum

Scott Fella Sat, 03/27/2010 - 11:12
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For 'N' you need 40mhz.  For MIMO you don't.

Peter Nugent Sat, 03/27/2010 - 11:29
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The two fundaments of N are MIMO and the various techniques used to enhance this such as beamforming, this only takes N currently to 290Mbps approximately with a single channel MCS31 and 4 spatial streams. Commercially I think the highest supported is MCS15 (be nice to get some MCS31 in the future). The second fundamental change is channel bonding which allows you to have 40MHz channels. 802.11N has from 1 to 4 spatial stream ie 1 to 4 antennas TX and the same RX. 1x1 etc to 4x4. 802.11n does not specify that channel bonding can't be used in the 2.4GHz range nor does it specify that to be 802.11n you have to use channel bonding.b

Scott Fella Sat, 03/27/2010 - 12:29
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Just to clarify, I mentioned in my previous post to enable 'N' only on the 5ghz side and not on the 2.4ghz (40mhz)... not that you can't.... Can you enable 40mhz on the 2.4ghz yes you can if you want to.

Scott Fella Sat, 03/27/2010 - 12:38
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Peter Nugent Sat, 03/27/2010 - 13:08
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I think I have read all of themb, I am not disagreeing with what you are saying apart from "For 'N' you need 40mhz.  For MIMO you don't."


You do not have to have 40MHz for 802.11n. Single channel 20MHz data rates are quoted for MCS. To channel bond you should use 5.0GHZ but channel bonding only further extends 802.11n. Cisco do not support channel bonding on 2.4GHz but they do support 802.11n on 2.4GHz.

Robert.N.Barrett_2 Sun, 03/28/2010 - 06:17
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I agree with Pete.  I am typing this while connected to an autonomous 1250 configured for single-channel 2.4GHz 802.11n and dual-channel 5GHz 802.11n.  I also have ClientLink enabled, which is supposed to improve signal-strength (and thus speed) for 802.11g/a devices, but I have not tested the throughput with/without ClientLink.


To enable ClientLink, enter this CLI command in interface configuration mode for each 802.11n radio interfaces:


beamform ofdm

George Stefanick Sun, 03/28/2010 - 13:57
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Yes, that sounds correct. In fact you can have 20 MHz spacing and achive 144 mps with 802.11n. You

u can achive 300 mbps when you BOND to 40 MHz.

In regarding to "channel bonding" in the 5Ghz band, would someone share the factors/guidelines about the parameter 40-above vs 40-below (i.e. channel width [20 | 40-above | 40-below]).  If this is based on my RF environment, would I be using the "show controller dot11Radio 1" output to consider what to use?


FYI, currently we have some users using 802.11g and some others using 802.11n (or at least trying to).  At the interface dot11Radio 1, I have enable "DFS" (i.e. channel dfs) and "dfs band 3 block" (but I don't know when/why this statement is there).


Thanks.

Scott Fella Thu, 04/01/2010 - 11:59
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Here is a Cisco 802.11n Design Guide link: http://www.cisco.com/en/US/solutions/collateral/ns340/ns394/ns348/ns767/white_paper_80211n_design_and_deployment_guidelines.html


Basically if you set a channel on the 5ghz to 157, you can either use the cahnnel above (161) or the channel below (153).

Currently DFS is enable, which I think this means the AP will dynamically change channels based on RF environment.  If so, does this imply I should disable DFS before doing channel bonding?  Or, DFS will continue work with channel bonding?  That is, say if I use "channel width 40-below", then DFS would only switch to channels that are within range that is below 157?


Thanks.

Scott Fella Thu, 04/01/2010 - 12:19
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DFS will continue to work in the unii-2 and unii-2 extended because it is required.


http://www.cisco.com/en/US/docs/wireless/technology/1140/deployment/guide/1140dep.html#wp999119


Here is a youtube video:)

http://www.youtube.com/watch?v=YNYM1Gn0Rzg

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