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You are here: Home / Cisco Wireless / Aironet 1242 AG Access Points dropping up and down

Aironet 1242 AG Access Points dropping up and down

Written By Harris Andrea

The following is taken from the Cisco NetPro discussion forum, regarding cisco wireless access points which are dropping clients randomly. I thought it might interest somone so I repost the issue here:

Problem:
I have anywhere from 5-20 access points drop up and down throughout the day out of a total of around 200. I am currently trying to go through and figure out why we our access points are having some many issues and how I might be able to resolve them.

One of the logs that I commonly see is:

AP ‘exp-p13’, interface ‘802.11a’ on Controller ‘10.2.192.25’. Channel changed to ’44’ from ’60’ due to ‘None’. Interference Energy before update is ‘0’ and after update is ‘0’. Noise before update is ‘0’ and after update is ‘0’. Interference before update is ‘0’ and after update is ‘0’.

Is there anyway to determine what the cause of this is?

Controller Firmware: 4.2.130.0.
AP Model AIR-LAP1242AG-A-K9
IOS Version 12.4(10b)JA4

MORE READING:  How to Setup Cisco Meraki WiFi Access Point Devices (With Pictures)

Solution:
Sounds like it’s just the Radio Resource Management (RRM) on the controller. You can disable this if it’s dropping clients. Go to the wireless tab, look on the left, and click on the 802.11a/n or 802.11b/g/n dropdown. Then click on the RRM dropdown, and click on Auto RF.

My advice is to change both power and channel assignment algorithms to “On Demand”. You can invoke them as needed to maintain an optimum network. By default, it automatically invokes the update every 10 minutes.

Related Posts

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  • Converting an Autonomous Access Point to Lightweight AP
  • Cisco Wireless LAN Controller Basic Configuration
  • Cisco Router WiFi Wireless Configuration – 881W

Filed Under: Cisco Wireless

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About Harris Andrea

Harris Andrea is an Engineer with more than two decades of professional experience in the fields of TCP/IP Networks, Information Security and I.T. Over the years he has acquired several professional certifications such as CCNA, CCNP, CEH, ECSA etc.

He is a self-published author of two books ("Cisco ASA Firewall Fundamentals" and "Cisco VPN Configuration Guide") which are available at Amazon and on this website as well.

Comments

  1. Sheikshareef says

    June 1, 2015 at 9:45 pm

    Hi Sir,
    I need hands on practical experience on configuration and troubleshooting about cisco wireless controller and APs.Please provide me your valuable suggestions and documents also.

    Thanks and Regards,
    Sheik Shareef.

  2. Harris Andrea says

    June 2, 2015 at 4:51 am

    Sheik,
    Unfortunately I don’t have documentation about cisco wireless.

    Harris

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