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Cisco IOS Software Configuration Guide for Cisco Aironet Access Points
OL-30644-01
Chapter6 Configuring Radio Settings
Enabling and Disabling World Mode
Enabling and Disabling World Mode
You can configure the wireless device to support 802.11d world mode, Cisco legacy world mode, or
world mode roaming. When you enable world mode, the AP adds channel carrier set information to its
beacon. Client devices with world mode enabled receive the carrier set information and adjust their
settings automatically. For example, a client device used primarily in Japan could rely on world mode to
adjust its channel and power settings automatically when it travels to Italy and joins a network there.
World mode is disabled by default.
Beginning in privileged EXEC mode, follow these steps to enable world mode:
Use the no form of the command to disable world mode.
Disabling and Enabling Short Radio Preambles
The radio preamble is a section of data at the head of a frame that helps the APs and clients to
synchronize their communication. You can set the radio preamble to long or short:
•Short—A short preamble improves throughput performance. Cisco Aironet Wireless LAN Client
Adapters support short preambles. Any 802.11b or 802.11g certified device supports short
preambles. However, some client devices still require long preambles, even when they are 802.11b/g
certified.
Command Purpose
Step1 configure terminal Enter global configuration mode.
Step2 interface dot11radio {0slot/port | 1} Enter interface configuration mode for the radio interface.
Step3 world-mode
dot11d country_code code
{ both | indoor | outdoor }
world-mode roaming
| legacy
Enable world mode.
•Enter the dot11d option to enable 802.11d world mode.
–
When you enter the dot11d option, you must enter a
two-character ISO country code (for example, the ISO
country code for the United States is US). You can find
a list of ISO country codes at the ISO website.
–
After the country code, you must enter indoor,
outdoor, or both to indicate the placement of the
wireless device.
•Enter the legacy option to enable Cisco legacy world
mode.
•Enter the world-mode roaming to place the access point
in a continuous world mode configuration.
Note Aironet extensions must be enabled for legacy world
mode operation, but Aironet extensions are not
required for 802.11d world mode. Aironet extensions
are enabled by default.
Step4 end Return to privileged EXEC mode.
Step5 copy running-config startup-config (Optional) Save your entries in the configuration file.