Category Archives: Wireless

How to literally kill Cisco WLC 4402

This post is a warning. Only to make people aware of a “VERY VERY BAD PRACTICE”. I have managed to kill my lab Cisco WLC 4402 yesterday. We all know that routers and switches (even Standalone APs) can be upgraded through the recovery mode (it’s when the boot process is being interrupted). Some devices, like access points, support TFTP recovery, others can only be updated via XMODEM. Cisco WLC 4400 is different, completely different. If you interrupt the boot process by pressing ESC, it will provide you with the recovery menu, where one of the options is “Manually update images”. This is what I tried yesterday, unluckily. Read more …

A correct way to shutdown Cisco Autonomous AP

An interesting fact – powered over Ethernet autonomous Cisco access point continue to associate clients even if you shutdown the relevant switch port! I recently shutdown the switch port to which a spare access point has been connected, assuming it will stop providing PoE. Few days later my friend’s IT specialist reported their customers have connectivity problems when they approach that particular access point. He also asked if the blue light reflects a working condition. That knocked me down. How could it be powered on if I administratively disabled the switch port?! Read more …