WLC or any Network device would face many difficulties to keep track of all this information and keep historical data for long. But you can manually gather this data often via SNMP. You can check this post here for more details :
For this Network Management Applications are there, like to manage WLC there is Cisco Prime Infrastructure which can give you stats from controller. There are other third party applications as well, which can give you insight on your requirement.
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According to CCDA, the recommended ration is 20 clients per AP. I have seen up to 30 on an AP just fine, but it gets rough if you go much higher. I also think it depends on how many data streams or flows are actually happening and what the data type is. Because wireless is a shared medium, the more clients you have, the worse it'll get. With that in mind. If you have Voice going on over wireless, that may be an issue as well.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
This is the start of a display filter cross reference between Wireshark
and OmniPeek. The 1st installment is a table of advanced filters. More
filters will be added as time allows. It is a living doc, so check back
for changes every so often Please feel f...
I have created a Powershell script to automatically add a Wireless Guest
User on Cisco WLCs. (tested on 2500 Series) The script should be
completely self explanatory. Prerequisites: Powershell SNMP Module
(Install-Module -Name SNMP) SNMP Write Access to y...