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Cisco 3900 Series, Cisco 2900 Series, and Cisco 1900 Series Integrated Services Routers Generation 2 Software Configuration Guide
Chapter Configuring Radio Settings
Disabling and Enabling Aironet Extensions
The optional parameters can be configured independently or combined when you do not want to use the
defaults, as shown in the following examples:
(config-if)#
probe-response gratuitous period 30
(config-if)#
probe-response gratuitous speed 12.0
(config-if)#
probe-response gratuitous period 30 speed 12.0
Use the
no
form of the command to disable the GPR feature.
Disabling and Enabling Aironet Extensions
By default, the wireless device 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 wireless
device and associated client devices. Aironet extensions must be enabled to support these features:
•
Load balancing—Wireless device uses Aironet extensions to direct client devices to an access point
that provides the best connection to the network on the basis of such factors 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 the wireless device and all
associated client devices, adds a few bytes to each packet to make the packets tamper-proof.
•
Cisco Key Integrity Protocol (CKIP)—Cisco’s WEP key permutation technique is based on an early
algorithm presented by the IEEE 802.11i security task group. The standards-based algorithm,
Temporal Key Integrity Protocol (TKIP), does not require Aironet extensions to be enabled.
•
World mode (legacy only)—Client devices with legacy world mode enabled receive carrier set
information from the wireless device and adjust their settings automatically. Aironet extensions are
not required for 802.11d world mode operation.
•
Limiting the power level on associated client devices—When a client device associates to the
wireless device, the wireless device 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 wireless device. Aironet extensions are enabled by default.
To disable Aironet extensions, follow these steps, beginning in privileged EXEC mode.
SUMMARY STEPS
1.
configure terminal
2.
interface dot11radio
{
0
|
1
}
3.
no dot11 extension aironet
4.
end
5.
copy running-config startup-config
Step 5
speed
{[
6.0
] [
9.0
] [
12.0
] [
18.0
] [
24.0
]
[
36.0
] [
48.0
] [
54.0
]}
(Optional) Sets the response speed in Mbps. The default value
is 6.0.
Step 6
end
Returns to privileged EXEC mode.
Step 7
copy running-config startup-config
(Optional) Saves your entries in the configuration file.
Command
Purpose
