INTEL WIRELESS
Wired Stuff
WiFi Tablet Corner
My80211 White Papers (Coming Soon!)

Cisco Wireless Compatibility Matrix (Nov. 2011)

Podcasts / Videos

My80211 Videos

Cisco: 802 11 frames with Cisco VIP George Stefanick

Fluke Networks: Minimize Wi Fi Network Downtime

Aruba: Packets never lie: An in-depth overview of 802.11 frames

ATM15 Ten Talk “Wifi drivers and devices”

Houston Methodist Innovates with Wireless Technology

Bruce Frederick Antennas (1/2)

 

Bruce Frederick dB,dBi,dBd (2/2)

Cisco AP Group Nugget

Social Links
Revolution WiFi Capacity Planner

Anchor / Office Extends Ports

 

Peek Inside Cisco's Gear

See inside Cisco's latest wireless gear!

2.4 GHz Channel Overlap

EXAMPLE 1  

EXAMPLE 2

EXAMPLE 3  

LWAPP QoS Packet Tagging

 

 

IEEE 802.11a/g/n Reference Sheet

 

Interference Types

BLUETOOTH
 

Microwave Oven
 

Cordless Phone

JAMMER!
 

CWSP RELEASE DATE 2/08/2010
  • CWSP Certified Wireless Security Professional Official Study Guide: Exam PW0-204
    CWSP Certified Wireless Security Professional Official Study Guide: Exam PW0-204
    by David D. Coleman, David A. Westcott, Bryan E. Harkins, Shawn M. Jackman

    Shawn Jackman (Jack) CWNE#54 is a personal friend and has been a mentor to me for many years.  I've had the pleasure and opportunity to work with Jack for 4 years. Jack is a great teacher who takes complex 802.11 standards and breaks them down so almost anyone can understand the concept at hand. I'm excited for you brother. Great job and job well done! Put another notch in the belt!

« How to upload the running AP IOS image to a TFTP Server | Main | Autonomous: Multiple SSID With Multiple VLANs configuration example on Cisco Aironet APs »
Saturday
Nov192011

Understanding Cisco Access Point IOS Images

From Aaron Leonard - Cisco

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       

 

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.

Reader Comments

There are no comments for this journal entry. To create a new comment, use the form below.

PostPost a New Comment

Enter your information below to add a new comment.

My response is on my own website »
Author Email (optional):
Author URL (optional):
Post:
 
Some HTML allowed: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <code> <em> <i> <strike> <strong>