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Bootloader Version............................... 4.0.217.0
Build Type....................................... DATA + WPS
Compact Flash Size............................... 256 MB
In order to view the active boot image, use the command show boot
(Cisco Controller) >show boot
Primary Boot Image............................... 4.0.217.0 (active)
Backup Boot Image................................ 4.0.155.5
Q. What is the procedure to upgrade the operating system (OS) software
on a Cisco WLC?
A. The Wireless LAN Controller (WLC) Software Upgrade to Versions 3.2, 4.0, and 4.1
document provides the procedure for a software upgrade on your WLC.
Q. Can I upgrade directly from Version 3.1.105 to Version 3.2.78, or do I
need to upgrade to Version 3.1.111 before I upgrade to Version 3.2.78?
A. Yes, you can upgrade directly to 3.2.78.0 from 3.1.105.0. After you set up a TFTP server,
you can choose Commands > Download File, and then choose Code from the File Type
menu to download the software to the WLC. Reboot the WLC after the file transfer for the
new code to take effect.
For instructions on how to perform the upgrade, refer to Wireless LAN Controller (WLC)
Software Upgrade to Versions 3.2, 4.0, and 4.1.
Q. Can an Airespace controller that runs Code Version 3.2 be upgraded
to Controller Version 4.0? If so, can it be directly upgraded or does it
have to be upgraded in increments?
A. All Airespace controllers run up to 3.2 code. Only the Cisco Controllers can run 4.0 and
later.
Q. Does the 4400 WLC route the VLANs that are configured on it like a
router?
A. The 4400 WLC is an appliance that attaches to your network but does not function like a
router. There should be a Layer 2 or Layer 3 device to provide the routing for the VLANs.
The WLC maps the SSID of the clients to the VLAN subnet and puts them back out the
management interface for the upstream routers to distribute/ACL, etc.
Q. What happens to the wireless network when I perform a software
upgrade? Do all the access points (APs) go down until they are
upgraded, or are they upgraded one at a time so that the wireless
network can remain up (except for the specific APs that undergo the
upgrade)?
A. The upgrade is done on the WLC, as well as on all the lightweight APs (LAPs).
Note: A LAP always has the same version as the WLC.