Issues with WLC 7.0.116 and iPhone/iPads iOS devices
We are using a WLC 2106 running 7.0.116 and notice that when iPhones are streaming data (e.g. YouTube) during WPA re-auths we get the following log entry:
Max EAPOL-key M3 retransmissions exceeded for client xxxxx
And the iPhone prompts for the username/password for EAP-PEAP.
This occurs on two different lab setups, one local auth, one MS IAS. Changing EAPOL timeout settings does not fix the problem.
Note that we rolled back to WLC 6.x software and the problem appears fixed. Is this a known issue in 7.0.116 that others have seen?
thanks,
Simon
Its speculation at this point stating its tied to CPU processing. If you obtain a capture of both low CPU and high CPU you could then state its CPU bound.
Specific to the session timeout, Increasing or disabling it makes sense. The only purpose of the session timeout is to regen the MSK keys which then seed the PMK,GMK. Cisco recommends to disable session timeout on voice because of its known problems with voice reliability.
In addition, client idle timeout impacts Apple "i" deivces more than any other divice. Do a lab and capture the traffic coming out of a iPad for exmaple. These devices dont chatter on the network like other devices.
Its not uncommon for iPads to drop off the network with default settngs on the WLC (but this doesnt explain your 7 vs 6 code). In fact we lab this where iPads client records get deleted after 300 seconds (default timer) and have to reauth becuase of this very issue. An adjustment of the timers aided this situation.
Call TAC see what they tell you ... I suspect they will review these same items and the EAP timeout, that you mentioned already.
I just checked and we have 768 ipads on our network at this very moment including mine.
I just moved my auth time to 5 minutes and I am pulling youtube and watched 3 auths and there is no problems.
You need to do a L2 capture and see what the iPad is doing. If the ipad sends its EAP creds and the WLC doesnt respond then you know its the WLC.
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