Specifications

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Cisco Aironet 1200 Series Access Point Installation and Configuration Guide
OL-3446-01
Chapter 7 Configuring Radio Settings
Disabling and Enabling Aironet Extensions
Disabling and Enabling Aironet Extensions
By default, the access point uses Cisco Aironet 802.11 extensions to detect the capabilities of Cisco
Aironet client devices and to support features that require specific interaction between the access point
and associated client devices. Aironet extensions must be enabled to support these features:
• Load balancing—The access point uses Aironet extensions to direct client devices to an access point
that provides the best connection to the network based on factors such as number of users, bit error
rates, and signal strength.
• Message Integrity Check (MIC)—MIC is an additional WEP security feature that prevents attacks
on encrypted packets called bit-flip attacks. The MIC, implemented on both the access point and all
associated client devices, adds a few bytes to each packet to make the packets tamper-proof.
• Temporal Key Integrity Protocol (TKIP)—TKIP, also known as WEP key hashing, is an additional
WEP security feature that defends against an attack on WEP in which the intruder uses an
unencrypted segment called the initialization vector (IV) in encrypted packets to calculate the WEP
key.
• Repeater mode—Aironet extensions must be enabled on repeater access points and on the root
access points to which they associate.
• World mode—Client devices with world mode enabled receive carrier set information from the
access point and adjust their settings automatically.
• Limiting the power level on associated client devices—When a client device associates to the access
point, the access point sends the maximum allowed power level setting to the client.
Disabling Aironet extensions disables the features listed above, but it sometimes improves the ability of
non-Cisco client devices to associate to the access point.
Aironet extensions are enabled by default. Beginning in privileged EXEC mode, follow these steps to
disable Aironet extensions:
Use the dot11 extension aironet command to enable Aironet extensions if they are disabled.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface dot11radio { 0 | 1 } Enter interface configuration mode for the radio interface. The
2.4-GHz radio is radio 0, and the 5-GHz radio is radio 1.
Step 3
no dot11 extension aironet Disable Aironet extensions.
Step 4
end Return to privileged EXEC mode.
Step 5
copy running-config startup-config (Optional) Save your entries in the configuration file.