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How to Configure Access point 801AP (881W router) for both N and G support?



How to configure both G & N support on 801AP (881W router) running IOS 12.4(21a)JY?


Please note that 802.11n supports WPA2 AES, PSK or NO authentication.

Q.     How to enable N configuration?

A.     802.11n requires AES cryptography be performed on all encrypted links. This means that you can get away with an open WLAN, but if you flip on Layer 2 crypto functions, you need to have Wi-Fi Protected Access 2 AES-enabled (with either Pre-Shared Key or back-end authentication, authorization, and accounting) or that WLAN won't work at all for 11n rates. You can go for a mix of crypto types (WPA with Temporal Key Integrity Protocol or AES and WPA2 with TKIP), just as long as you have WPA2 with AES-enabled.

Q.     Assume all WiFi clients support N and If we current configuration is set for a/b/g. Do we need to change anything on my WiFi client configurations? 

A.     Configure the Client for 802.11n

Configure 802.11n on the WLC

Configure the Client for 802.11n:- Many of the client cards operate in 2.4 GHz. Make sure you use the client card that supports 5 GHz to make use of channel bonding.

These steps show how to configure an Intel Card for 802.11n on an XP machine:

  1. Click the Start menu. Go to Settings and choose Control Panel.
  2. Double-click the Network Connections icon.
  3. Right-click the Intel Wireless Card and click Properties.
  4. Click the Advanced tab.
  5. Choose the Use the default value option for the Wireless Mode property so the client can operate either in 802.11a mode or in 802.11 b/g mode, whichever is available.


6.     Unless the network is comprised only of 802.11n clients, use Mixed mode protection so the 802.11n clients coexist with existing 802.11a or 802.11 b/g clients.


7.     Set the Channel Width either in Auto mode so the client negotiates the channel width with the WLC, or in 20 MHz if it is 2.4 GHz frequency band.


Note: Cisco supports 40 MHz only in 5 GHz band. Set the channel width option to Auto to make use of 40 MHz channel width. However, make sure 40 MHz channel width is enabled on the WLC.

8.     Disable the Fat Channel Intolerant property to allow 40 MHz Channel Bonding.



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