Cisco Cisco 2106 Wireless LAN Controller
11
Release Notes for Cisco Wireless LAN Controllers and Lightweight Access Points for Release 4.2.176.0
OL-31336-01
Important Notes
Configuration File Stored in XML Format
In controller software 4.2, the controller’s bootup configuration file is stored in an Extensible Markup
Language (XML) format rather than in binary format. Therefore, you cannot download a binary
configuration file onto a controller running software release 4.2. However, when you upgrade a
controller from a previous software release to 4.2, the configuration file is migrated and converted to
XML.
Language (XML) format rather than in binary format. Therefore, you cannot download a binary
configuration file onto a controller running software release 4.2. However, when you upgrade a
controller from a previous software release to 4.2, the configuration file is migrated and converted to
XML.
Web Authentication Redirects
The controller supports web authentication redirects only to HTTP (HTTP over TCP) servers. It does not
support web authentication redirects to HTTPS (HTTP over SSL) servers.
support web authentication redirects to HTTPS (HTTP over SSL) servers.
Disabling Radio Bands
The controller disables the radio bands that are not permitted by the configured country of operation
(CSCsi48220).
(CSCsi48220).
40-MHz Channels in the 2.4-GHz Band
Cisco recommends that you do not configure 40-MHz channels in the 2.4-GHz radio band because
severe co-channel interference is likely to occur.
severe co-channel interference is likely to occur.
Impact of External Antenna Gain on Transmit Power
In controller software release 4.2 or later, external antenna gain is factored into the maximum transmit
power of the access point. Therefore, when you upgrade from an earlier software release to 4.2 or later,
you might see a decrease in transmit power output.
power of the access point. Therefore, when you upgrade from an earlier software release to 4.2 or later,
you might see a decrease in transmit power output.
Supporting Oversized Access Point Images
Controller software release 4.2 or later allows you to upgrade to an oversized access point image by
deleting the recovery image to create sufficient space. This feature affects only access points with 8 MB
of flash (the 1100, 1200, and 1310 series access points). All newer access points have a larger flash size
than 8 MB.
deleting the recovery image to create sufficient space. This feature affects only access points with 8 MB
of flash (the 1100, 1200, and 1310 series access points). All newer access points have a larger flash size
than 8 MB.
Note
As of August 2007, there are no oversized access point images, but as new features are added, the access
point image size will continue to grow.
point image size will continue to grow.
The recovery image provides a backup image that can be used if an access point power-cycles during an
image upgrade. The best way to avoid the need for access point recovery is to prevent an access point
from power-cycling during a system upgrade. If a power-cycle occurs during an upgrade to an oversized
access point image, you can recover the access point using the TFTP recovery procedure.
image upgrade. The best way to avoid the need for access point recovery is to prevent an access point
from power-cycling during a system upgrade. If a power-cycle occurs during an upgrade to an oversized
access point image, you can recover the access point using the TFTP recovery procedure.
Follow these steps to perform the TFTP recovery procedure.