We have 9 AP541n's in a cluster. There are two in an area where there is a high concentration of devices (high being potentially 50-ish on an intermittent basis when Parliament sits). We believe there is only about devices 10 trying to connect at present and can only see 6 connections in the console after the recent reboot. These two units have been running along without incident until this week when the clients started a session (previously only 1-2 clients present). It seems that first one unit crashed/rebooted, then the other one in the same area rebooted soon after. I am guessing the second one rebooted when the clients all tried to connect to it after the first one crashed. Others in the cluster have remained operational and unaffected. They are running 2.0 code. We have been through the "DHCP issue" and this new versions seems to have cured that one, but the crashing under load is new.
They are pretty much default except for IP addresses obviously, a single vlan only, and using Radius mac authentication to a Microsoft RRAS server.
We logged a call with the Cisco helpdesk over other issues along the way (date and time resets, radius entries don't appear in the log until after an AP reboot) and got some person on the phone who eventually decided that they don't support Microsoft Radius, despite us trying to explain to him that it is nothing to do with the issue. He had no idea, no skills and didn't want to help. I am somewhat less impressed by Cisco now than I was. So....
Anyone got any ideas?