Ever lost the code you were running on an AP?  Then need to load that code to another?  What if that codes not available for download from CCO anymore?  Well, there's a pretty easy process to get through to get the image from an AP, and onto your TFTP server.

In this example, I am using a 1131, running 12.4(21a)JY

The first thing you need, is a TFTP server.  There are plenty of free ones out there.  I tested this with TFTPd32 on a PC, and with TFTPServer on a Mac(10.6).

So on the PC, it's pretty easy.  Configure your TFTP Server

Once you've stopped then started the server, you simply need to issue the command

archive upload-sw tftp://192.168.15.11/c1130-k9w7-mx.124-21a.JY.tar

As this command is running, it extracts the current running IOS, including the HTML files, and tar them as it's sending to the TFTP server.  <Term mon if you want to watch the process run.>


On the Mac, I found it to be a little bit different.  With my Mac, even though I did a chmod 777 on my tftp directory, I had to do the following before I attempted to upload the software.

Once the file is 'created' in my target directory it becomes the same as the PC version.

archive upload-sw tftp://192.168.15.6/c1130-k9w7-mx.124-21a.JY.tar


Now, if you have multiple versions of code that have been extracted to your AP, there is a switch that can be used, /version

archive upload-sw /version c1130-k9w7-mx.124-21a.JY tftp://192.168.15.6/c1130-k9w7-mx.124-21a.JY.tar
                                                 ^this would be the version you wanted to upload.

All Cisco Aironet wireless access points and bridges currently being shipped run IOS.  The only exception is the OEAP602.  (Some older Cisco access points did not run IOS, such as the Aironet 340 which ran only VxWorks, and the 1000 series lightweight APs.)

Access Point IOS is distributed as a tar file.  These tar files can be downloaded from cisco.com SDS; lightweight IOS images (k9w8) are also bundled in the WLC software images (.aes.)

The IOS image names include the following components:

platform-featureset-tar.version.tar

• platform- the access point hardware model or family supported by the image       
  • examples: c1250; ap3g1 - 3500/1260; ap801- AP embedded in 881W; c1520 - 1520/1550
• featureset- the set of software features supported by the image - one of:      
  • k9w7 - autonomous IOS
  • k9w8 - full lightweight IOS (this is what is bundled in the WLC .aes image, and is factory installed on "mesh" APs)
  • rcvk9w8 - lightweight recovery image - this is factory installed on lightweight APs, unless a "mesh" image is specified; it lacks radio firmware
• version- the IOS version       
  • There is a 1:1 mapping between the lightweight IOS software version (such as 12.4(23c)JA) and the CUWN version (such as 7.0.98.0)  
    • see the Wireless Solutions Software Compatibility Matrix on CCO

Example: c1240-k9w7-tar.124-25d.JA1.tar

• Platform: c1240: 1240 series AP
• Featureset: k9w7: autonomous IOS
• Version: 124-25d.JA1: 12.4(25d)JA1
  

As AP IOS is always distributed as a tar file, the AP cannot directly execute such a file (thus, if you were to copy c1240-k9w7-tar.124-25d.JA1.tar directly onto AP flash, and then try to boot it, this could not work.)  The tar file contains, in addition to the IOS image proper, the radio firmware files, the HTML GUI files (if present), and various other files.  The AP IOS tar file must be unbundled into AP flash using the archive exec command (this is done in an automated fashion when a lightweight AP is upgraded after joining a WLC.)  After unbundling, the IOS image itself be in a file called flash:/platform-featureset-mx.version/platform-featureset-mx.version - for example, flash:/c1240-k9w7-mx.124-25d.JA1/c1240-k9w7-mx.124-25d.JA1.  The AP is configured to boot this image if the bootloader BOOT environmental variable is set accordingly.

This video is by Surendra. Surendra is not only a bad ass Cisco TAC enigneer but he also leads the pack on Cisco Wireless Support forum. He is by far one of the most active Cisco Wireless TAC engineer contributors who gives back to the community.

In this video Surendra shows how to configure multiple SSIDs with multiple VLANs.