Core Issue
Problem was identified in AP1000 low level driver code. Driver code was setting the noise imunity level to very high value causing chip to drop a valid packet from client.
The low-level drivers on the Access Points (APs) erroneously multiply the number of non-responses to the controllers, causing the controllers to drop the clients from the association table more quickly than they should. This affects some Network Interface Cards (NICs) more than others. If NIC cards are well-behaved and responsive, the multiplication does nothappen (for example, 0 X multiplier = 0).
But if NIC cards are poorly behaved or if RF conditions are not optimal, there are non-responses.
Resolution
This issue is documented in Cisco bug ID CSCsd22087.
This issue is first found in version 3.2(78) and is first fixed in versions 4.0(155) and 3.2(116.21)
It is also being fixed in Amberhill MR1.
The upgrade can be done through the Graphical User Interface (GUI) or the Command Line Interace (CLI), as shown:
transfer download serverip
transfer download filename
transfer download datatype code
transfer download path /
transfer download start
The fix for these is in the 3.2.116.21 controller code. Refer to Wireless LAN Software.
For more information, refer to Release notes for Cisco Wireless LAN Controllers and Lightweight Access Points for Release 3.2.116.21.
Problem Type
Associated but cannot pass any traffic
Products
Access point
4400 Series
LAP 1000
Radio Type / Standards
802.11g
Topology
LWAPP network
SW Features
Lightwieght Access Point Protocol (LWAPP)
