Radar Detection On A Dfs Channel; Cli Commands; Confirming That Dfs Is Enabled - Allen-Bradley Stratix 5100 User Manual

CLI Commands

*Mar 6 12:35:09.750: %DOT11-6-DFS_TRIGGERED: DFS: triggered on
frequency 5500 MHz
When radar is detected on a channel, that channel can not be used for 30
minutes. The access point maintains a flag in nonvolatile storage for each channel
that it detects radar on in the last 30 minutes. After 30 minutes, the flag is cleared
for the corresponding channel. If the access point is restarted before a flag is
cleared, the non-occupancy time is reset to 30 minutes when the channel
initializes.
The maximum legal transmit power is greater for some 5 GHz channels than
TIP
for others. When it randomly selects a 5 GHz channel where the power is
restricted, the access point automatically reduces transmit power to comply
with power limits for that channel.
We recommend that you use the
TIP
country-code configuration interface
configure a country code on DFS-enabled radios.
The IEEE 802.11h protocol requires access points to include the country
information element (IE) in beacons and probe responses. By default, however,
the country code in the IE is blank. You use the world-mode command to
populate the country code IE.

Radar Detection on a DFS Channel

When an access point detects a radar on a DFS channel, the access point creates a
file in its flash memory. The file is based on the 802.11a radio serial number and
contains the channel numbers where the radar is detected. This is an expected
behavior and you can not remove this file.
The following sections describe CLI commands that apply to DFS.

Confirming that DFS is Enabled

Use the
show controllers dot11radio1
is enabled. The command also includes indications that uniform spreading is
required and channels that are in the non-occupancy period due to radar
detection.
This example shows a line from the output for the
command for a channel where the DFS is enabled. The indications listed in the
previous paragraph are shown in bold:
ap#show controller dot11radio1
!
interface Dot11Radio1
Rockwell Automation Publication 1783-UM006A-EN-P - May 2014
Configuring Radio Settings
world-mode dot11d
command to confirm that DFS
show controller
Chapter 7
command to
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