Cisco Cisco Aironet 1310 Access Point Bridge Release Notes
20
Release Notes for Cisco Aironet Access Points for Cisco IOS Release 12.3(8)JEA1
OL-12427-01
Troubleshooting
Troubleshooting
For the most up-to-date, detailed troubleshooting information, refer to the Cisco TAC website at
http://www.cisco.com/cisco/web/support/index.html
. Click Technology Support, choose Wireless
from the menu on the left, and click Wireless LAN.
Documentation Updates
This section lists changes, errors, and omissions from user documentation for access points.
Changes
This section describes changes to access point and bridge documentation for this release.
DFS Automatically Enabled on Some 5-GHz Radio Channels in North America
Access points with 5-GHz radios configured at the factory for use in North America now comply with
regulations that require radio devices to use Dynamic Frequency Selection (DFS) to detect radar signals
and avoid interfering with them.
regulations that require radio devices to use Dynamic Frequency Selection (DFS) to detect radar signals
and avoid interfering with them.
By default, the access point automatically uses DFS to set the operating frequency on 5-GHz radios. The
access point randomly selects a frequency from among these frequencies:
access point randomly selects a frequency from among these frequencies:
•
Frequencies 5.150 to 5.250 GHz (also known as the UNII-1 band)
•
Frequencies 5.250 to 5.350 GHz (also known as the UNII-2 band)
•
Frequencies 5.470 to 5.725 GHz (also known as the UNII-3 band)
•
Frequencies 5.725 to 5.825 GHz (also known as the UNII-4 band)
Note
By default, Band 3 (5.470 to 5.725 GHz) is disabled to allow backward compatibility with older clients.
You must explicitly enable it in the Radio Settings page of the GUI or by using the dfs band block radio
interface CLI command.
You must explicitly enable it in the Radio Settings page of the GUI or by using the dfs band block radio
interface CLI command.
When DFS is enabled, the access point monitors its operating frequency for radar signals. If it detects
radar signals on the channel, the access point takes these steps:
radar signals on the channel, the access point takes these steps:
•
Blocks new transmissions on the channel.
•
Flushes the power-save client queues.
•
Broadcasts an 802.11h channel-switch announcement.
•
Disassociates remaining client devices.
•
If participating in WDS, sends a DFS notification to the active WDS device that it is leaving the
frequency.
frequency.
•
Randomly selects a different 5-GHz channel.
•
Scans the new channel for radar signals for 60 seconds.
•
If there are no radar signals on the new channel, enables beacons and accepts client associations.