Hello,
See my comments:
Also, the RSSI seems to fluctuate wildly.
A: This is often how a device hears the frames. Sometimes in high interference you can epxect this to jump around. I normally like to see if all the devices are doing this or just a select few. Sometimes poor clients jump around more than others.
I should add that we have disabled up to 11mbps data rates on the controller and we're running 7.6.100.0 currently, but plan to upgrade to 7.6.110.0 tonight.
A: I dont think turning off lower rates are bad unless your WiFi cant support the design. Good call get on the latest.
I guess my question is how can an SSID just drop off the client view if others on the same AP are fine?
A: Again, its a client missing frames like beacons.
How does the AP deal with multiple SSIDs and does it prioritise?
A: This SSIDs are virtualized. I blogged how this is done:
http://www.my80211.com/home/2011/5/2/wlc-how-cisco-virtualizes-the-base-radio-mac-address-on-the.html
I have to add that I've never had this issue and I'm just using a company standard HP laptop with an Intel chipset.
A: Again I think if you search you might see this is more around specific devices. I would do a packet capture and see what is going on. Recently had to troubleshoot an Android only to find out it was just bad wifi client. Always sending NULL frames and scanning and not passing traffic
"Satisfaction does not come from knowing the solution, it comes from knowing why." - Rosalind Franklin
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