Operation State Down, Cause=Max Retrasmission

Unanswered Question
Nov 17th, 2008


My setup:

WLC 4402

1131 Access points

Problem: Sometimes AP radios are shutdown

Trap Logs show this:

AP's Interface:0(802.11a) Operation State Down: Base Radio MAC:00:21:55:ac:29:40 Cause=Max Retrasmission

AP's Interface:0(802.11b) Operation State Down: Base Radio MAC:00:21:55:ac:29:40 Cause=Max Retrasmission

what's cause and how to sovle this problem?


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l.mourits Tue, 11/18/2008 - 03:46


Not sure if this goes for you, but I've seen similar messages when I had H-REAP configured LAPs controlled by a remote controller, where the round trip delay exceeded the 120ms (as mentioned in the design guide 120ms is the max RTD between LAP and Controller).



libra_lin Tue, 11/18/2008 - 18:03

Yes, our problem same with you. could you tell me how to solve this problem. TKS!

l.mourits Wed, 11/19/2008 - 00:21

I had to install a controller in a location closer by, with a better round trip delay between controller and access-point to get this resolved.

After I installed the controller with less then 120ms RTD to the APs, the problem was gone.




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