Cisco Cisco 2106 Wireless LAN Controller
5
Release Notes for Cisco Wireless LAN Controllers and Lightweight Access Points for Release 4.2.112.0
OL-31336-01
Software Release Information
Upgrading to a New Software Release
When you upgrade the controller’s software, the software on the controller’s associated access points is
also automatically upgraded. When an access point is loading software, each of its LEDs blinks in
succession. Up to 10 access points can be concurrently upgraded from the controller.
also automatically upgraded. When an access point is loading software, each of its LEDs blinks in
succession. Up to 10 access points can be concurrently upgraded from the controller.
Note
When you downgrade from 4.2.112.0 to 4.2.61.0 or an earlier release, the LWAPP mode may or may not
change from Layer 3 to Layer 2, depending on whether the configuration was saved in the earlier image.
If the LWAPP mode changes, access points may not join the controller, and you must manually reset the
controller to Layer 3 to resolve this issue.
change from Layer 3 to Layer 2, depending on whether the configuration was saved in the earlier image.
If the LWAPP mode changes, access points may not join the controller, and you must manually reset the
controller to Layer 3 to resolve this issue.
Caution
Do not power down the controller or any access point during this process; otherwise, you might corrupt
the software image. Upgrading a controller with a large number of access points can take as long as 30
minutes, depending on the size of your network. However, with the increased number of concurrent
access point upgrades supported in software release 4.0.206.0 and later, the upgrade time should be
significantly reduced. The access points must remain powered, and the controller must not be reset
during this time.
the software image. Upgrading a controller with a large number of access points can take as long as 30
minutes, depending on the size of your network. However, with the increased number of concurrent
access point upgrades supported in software release 4.0.206.0 and later, the upgrade time should be
significantly reduced. The access points must remain powered, and the controller must not be reset
during this time.
Special Rules for Upgrading to Controller Software Release 4.2.112.0
Caution
Before upgrading your controller to software release 4.2.112.0, you must comply with the following
rules.
rules.
•
Make sure you have a TFTP server available for the software upgrade. Keep these guidelines in mind
when setting up a TFTP server:
when setting up a TFTP server:
–
Controller software release 4.2.112.0 is greater than 32 MB; therefore, you must make sure that
your TFTP server supports files that are larger than 32 MB. Some TFTP servers that support
files of this size are tftpd and the TFTP server within the WCS. If you attempt to download the
4.2.112.0 controller software and your TFTP server does not support files of this size, the
following error message appears: “TFTP failure while storing in flash.”
your TFTP server supports files that are larger than 32 MB. Some TFTP servers that support
files of this size are tftpd and the TFTP server within the WCS. If you attempt to download the
4.2.112.0 controller software and your TFTP server does not support files of this size, the
following error message appears: “TFTP failure while storing in flash.”
–
If you are upgrading through the service port, the TFTP server must be on the same subnet as
the service port because the service port is not routable, or you must create static routes on the
controller.
the service port because the service port is not routable, or you must create static routes on the
controller.
–
If you are upgrading through the distribution system network port, the TFTP server can be on
the same or a different subnet because the distribution system port is routable.
the same or a different subnet because the distribution system port is routable.
–
A third-party TFTP server cannot run on the same computer as the WCS because the WCS
built-in TFTP server and the third-party TFTP server require the same communication port.
built-in TFTP server and the third-party TFTP server require the same communication port.
•
If your controller is running software release 3.2.195.10 (or a later 3.2 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 or 4.2.99.0, you can upgrade your
controller directly to software release 4.2.112.0. If your controller is running an earlier 3.2 or 4.0
release, you must upgrade your controller to an intermediate release prior to upgrading to 4.2.112.0.
4.0 release), 4.1.171.0 (or a later 4.1 release), or 4.2.61.0 or 4.2.99.0, you can upgrade your
controller directly to software release 4.2.112.0. If your controller is running an earlier 3.2 or 4.0
release, you must upgrade your controller to an intermediate release prior to upgrading to 4.2.112.0.
shows the upgrade path that you must follow before downloading software release 4.2.112.0.