Cisco Cisco 2106 Wireless LAN Controller Release Notes
6
Release Notes for Cisco Wireless LAN Controllers and Lightweight Access Points for Release 5.0.148.0
OL-31336-01
Software Release Information
•
You can upgrade or downgrade the controller software only between two releases. To upgrade or
downgrade beyond two releases, you must first install an intermediate release. For example, if your
controller is running a 4.1 or 4.2 software release, you can upgrade your controller directly to
software release 5.0.148.0. If your controller is running a 3.2 or 4.0 release, you must upgrade your
controller to an intermediate release prior to upgrading to 5.0.148.0.
downgrade beyond two releases, you must first install an intermediate release. For example, if your
controller is running a 4.1 or 4.2 software release, you can upgrade your controller directly to
software release 5.0.148.0. If your controller is running a 3.2 or 4.0 release, you must upgrade your
controller to an intermediate release prior to upgrading to 5.0.148.0.
shows the upgrade path
that you must follow before downloading software release 5.0.148.0.
Note
When you upgrade the controller to an intermediate software release, wait until all of the
access points joined to the controller are upgraded to the intermediate release before you
install the 5.0.148.0 software. In large networks, it can take some time to download the
software on each access point.
access points joined to the controller are upgraded to the intermediate release before you
install the 5.0.148.0 software. In large networks, it can take some time to download the
software on each access point.
•
Cisco recommends that you also install the Cisco Unified Wireless Network Controller Boot
Software 5.0.148.0 ER.aes file on the controller. This file resolves defect CSCsd52483 and is
necessary to ensure proper operation of the controller. The ER.aes file can be installed on all
controller platforms. If you do not install this ER.aes file, your controller does not obtain the fix for
this defect, and “Error” appears in the Bootloader Version field in the output of the show sysinfo
command.
Software 5.0.148.0 ER.aes file on the controller. This file resolves defect CSCsd52483 and is
necessary to ensure proper operation of the controller. The ER.aes file can be installed on all
controller platforms. If you do not install this ER.aes file, your controller does not obtain the fix for
this defect, and “Error” appears in the Bootloader Version field in the output of the show sysinfo
command.
Note
Unlike previous ER images, a new bootloader file is not loaded when you install the
5.0.148.0 ER.aes file. This is true for all controllers. The 4.2.112.0 ER.aes file is the last ER
file to contain a bootloader. If you want the latest bootloader, install the 4.2.112.0 ER.aes
file. If you want to obtain the fix for CSCsd52483, also install the 5.0.148.0 ER.aes file.
5.0.148.0 ER.aes file. This is true for all controllers. The 4.2.112.0 ER.aes file is the last ER
file to contain a bootloader. If you want the latest bootloader, install the 4.2.112.0 ER.aes
file. If you want to obtain the fix for CSCsd52483, also install the 5.0.148.0 ER.aes file.
Note
The ER.aes files are independent from the controller software files. You can run any
controller software file with any ER.aes file. However, installing the latest boot software file
(5.0.148.0 ER.aes) ensures that the boot software modifications in all of the previous and
current boot software ER.aes files are installed.
controller software file with any ER.aes file. However, installing the latest boot software file
(5.0.148.0 ER.aes) ensures that the boot software modifications in all of the previous and
current boot software ER.aes files are installed.
Caution
If you require a downgrade from one release to another, you may lose the configuration from your
current release. The workaround is to reload the previous controller configuration files saved on the
backup server or to reconfigure the controller.
current release. The workaround is to reload the previous controller configuration files saved on the
backup server or to reconfigure the controller.
Table 1
Upgrade Path to Controller Software Release 5.0.148.0
Current Software Release
Upgrade Path to 5.0.148.0 Software
3.2.78.0 or later 3.2 release
Upgrade to 4.0.206.0 (or a later 4.0 release) before upgrading to
5.0.148.0.
5.0.148.0.
4.0.155.5
Upgrade to 4.0.206.0 (or a later 4.0 release) before upgrading to
5.0.148.0.
5.0.148.0.
4.0.179.11
4.0.206.0 or later 4.0 release
You can upgrade directly to 5.0.148.0.
4.1.171.0 or later 4.1 release
You can upgrade directly to 5.0.148.0.
4.2.61.0 or later 4.2 release
You can upgrade directly to 5.0.148.0.