Release Notes

Release Notes for Cisco Wireless LAN Controllers and Lightweight Access Points for Release 4.2.176.0

OL-31336-01

Software Release Information

• If your controller is running software release 4.0.206.0 (or a later 4.0 release), 4.1.171.0 (or a later

4.1 release), or 4.2.61.0, 4.2.99.0, 4.2.112.0, or 4.2.130.0, you can upgrade your controller directly

to software release 4.2.176.0. If your controller is running a 3.2 release or a 4.0 release prior to

4.0.206.0, you must upgrade your controller to an intermediate release prior to upgrading to

4.2.176.0. Table 1 shows the upgrade path that you must follow before downloading software release

4.2.176.0.

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

4.2.176.0 software. In large networks, it can take some time to download the software on each

access point.

• Cisco requires you to install the Cisco Unified Wireless Network Controller Boot Software

4.2.112.0 ER.aes file on the following controllers: 4400 series, Cisco WiSM, and Catalyst 3750G

Wireless LAN Controller Switch. It is optional on other controller platforms. This file resolves

CSCso00774 and is necessary to ensure proper operation of the controller. If you do not install the

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 When you install the ER.aes file, a new bootloader file is also loaded. This is true for all

controllers except the 2106 controller, for which the bootloader is not upgradable.

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

(4.2.112.0 ER.aes) ensures that the boot software modifications in all of the previous and

current boot software ER.aes files are installed.

Table 1 Upgrade Path to Controller Software Release 4.2.176.0

Current Software Release Upgrade Path to 4.2.176.0 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

4.2.176.0.

4.0.155.5 Upgrade to 4.0.206.0 (or a later 4.0 release) before upgrading to

4.2.176.0.

4.0.179.11

4.0.206.0 or later 4.0 release You can upgrade directly to 4.2.176.0.

4.1.171.0 or later 4.1 release You can upgrade directly to 4.2.176.0.

4.2.61.0 You can upgrade directly to 4.2.176.0.

4.2.99.0 You can upgrade directly to 4.2.176.0.

4.2.112.0 You can upgrade directly to 4.2.176.0.

4.2.130.0 You can upgrade directly to 4.2.176.0.

4.2.173.0 You can upgrade directly to 4.2.176.0.