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© 2008, Cisco Systems, Inc. All rights reserved. Printed in USA.

© 2010 Cisco Systems, Inc. All rights reserved. CUWN v7.0—5-1

WLAN Maintenance and Troubleshooting: Device Code and ConfigurationManagement


Lesson Overview & Objectives

Overview – This lesson provides detailed instructions on how to transfer code and configuration files for devices in a Cisco WLAN environment.

Objectives – Upon completing this lesson, you will be able to transfer code and configuration files to and from a device by using appropriate Cisco wireless maintenance tools and commands.



Controller and Client Software

Software maintenance and upgrades can be performed in several ways

CLI

– Full software upgrade

– Individual software component upgrade

Controller Web

Controller and AP upgrades can be performed

Update controller and then reboot – APs upgrade after the reboot

Update controller and APs before reboot – known as AP Pre-Image Download


Controller Inventory

Go to Controller > Inventory.



AP Software and Hardware Information

At the AP Configuration page:

Choose General to see the AP software version.

Choose Inventory to see the AP hardware information.


Downloading New Controller Code

1. Go to Commands > Download File to download different types of files to the controller via TFTP or FTP.

2. In the Server Details section, include the TFTP/FTP server and filename details.

In order for new code to take effect, a Controller reboot is needed.



Manual Upgrade of Controller Code

Manual updating of specific corrupted files can be accomplished via the CLI.


These individual files are available only from Cisco technical support and allow for the upgrade of a particular part of the complete image.

Manual Upgrade of Controller Code (Cont.)

After the IP information has been entered, the window will show options for upgrading specific portions of code.



Uploading Files From Controller

Go to Commands > Upload File to copy a file from the controller to an FTP/TFTP server.

Define the server and file information for uploading a file from the Controller.


Resetting AP Configuration

From the AP configuration page, General tab, choose either to clear all AP configuration details or all configuration except IP address details.



Clearing the Controller Configuration

1. Go to Commands > Reset to Factory Default.

2. Click Reset to restore all controller configuration back to the factory default settings.

3. After clearing the configuration, reboot the controller without saving configuration.


Clearing the Controller Configuration (Cont.)

To reboot the controller, go to Commands > Reboot and click the Reboot button.

Save the configuration changes by choosing either the Save and Rebootor the Reboot without Saving option.

Commands > Reboot System > Save And Reboot or Reboot Without Save



AP Pre-Image Download

The Cisco WLC limits the number of concurrent AP image downloads.

It takes approximately 24 minutes to upgrade 100 APs on a Cisco 4400 Series WLC:

– Time to download the AP Image

– Time to boot the AP

Most CAPWAP APs can download and store more than one image in flash.

– Each image is typically 4-5MB.

– Most APs have at least 16MB of flash memory.

Through pre-image download, the upgraded image on the AP can be loaded without causing the AP to reload.

After the APs have received and stored the upgrade image:

– The controller and APs can be rebooted simultaneously.

– The APs can join controller without initiating an image download phase.


Upgrading a Controller without Pre-Image Download

A. Controller reboots to run the new image.

B. AP discovers and joins the controller.

C. AP downloads the new image from controller.

D. AP reboots.

E. AP rediscovers and rejoins the controller.

Total network downtime to upgrade = A + B + C + D + E



Upgrading a Controller with Pre-Image Download

A. Controller loads the new image, but does not

reload yet.

B. Controller instructs AP to pre-download and save

the new image in flash.

C. AP downloads the new image from controller.

D. AP and controller reboot simultaneously.

Total network downtime to upgrade = D + E

D. Controller instructs AP to reboot and controller

resets itself.

E. AP rediscovers and rejoins the controller.


AP Pre-Image Download—Download Image to Controller

1. Go to Commands > Download File and download a new code image to the controller.

2. Do not reboot the controller yet.



AP Pre-Image Download—Verify Images on Controller

• Shows the new image as the active image for the next reload.

• Set the backup image (7.0.85.123) to be the active image.

• In case of power outage or some other problem, if the controller reloads before the APs have been upgraded, the old image will still be loaded.


AP Pre-Image Download—Initiate Pre-download to APs

• The Wireless > All APs list shows the APs are still on the old version

• Clicking on the detail for an AP shows that Pre-Image Download has not been started



AP Pre-Image Download—Initiate Pre-download to APs

• Wireless > Global Configuration to cause the Primary (or Backup) image to be pre-downloaded to all APs

• AP details shows that Predownloading is in progress


AP Pre-Image Download—Pre-downloading Complete

• Pre-downloading has finished and 7.0.94.144 is now the backup image for all APs.



AP Pre-Image Download—Resetting the Controller and APs

• Reboot the controller:

– Immediately

– At a particular date and time

– In a certain time from now

Image > Interchange changes the active image back to the Primary image


Verify Controller and AP Versions

The controller is now running version 7.0.94.144

The APs are all now running version 7.0.94.144 as their Primary SW version



Lesson Summary

This lesson described the methods for transferring code and other files between devices in a Cisco Unified Wireless Network environment.

Specific discussions on the following topics were included:

Conducting a controller or AP hardware/software inventory.

Downloading new controller code

Uploading files from the controller

Clearing AP and controller configurations

Performing an AP pre-Image download


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