=> Many client connect this AP with low RSSI (< 20 db). If Smart-Roam is working well, those clients need to be disconnected.
In monitor tab (from ZD3000), i see this AP has 101 clients connected, but those client is not real. I search some client mac-address on whole system, and can't found any logs in any devices (Access switch, Core Switch or Internet gateway). When i reboot this AP, number of clients will be reduce to 5 or 6.
So, please help me to figure out, why this AP keep remain old clients.
Very curious info. I suggest to run latest ZD firmware that supports all your AP models, and turn off SmartRoam to get some better baseline details. Where density has led to using SmartRoam in the past, we've never needed to use higher than level 3. Maybe compare no SR to level 3 implementation after upgrade to current MR?
ZDs can show clients still connected in the WebUI, who haven't passed a session timeout, in case they come back into range/power on again, but I have only seen Active associations when checking an AP's 'get station wlan0 info' command, so that's what's curious to me. You're rebooting the AP kicks everyone off, so only a few had reconnected, btw.
I've change roam_factor from 5 to 3, and monitoring in half of day. This issues still happens.
As your comment " ZDs can show clients still connected in the WebUI, who haven't passed a session timeout, in case they come back into range/power on again"
In my configuration, Inactivity timeout: 5 minutes. But, let's check some random client on this AP. - Client connect from 30 minutes ago - Although, this client can't receive IP from DHCP Server, and it's not exchange any packet with AP. But it's still connect.
P/s: I'll prepare plan for upgrading firmware in next week and keep tracking.