I saw the problem on my topology page.
I expect to see entire my network, i mean all of my devices (all switches and APs).
But for some devices, it disappears from the topology page. then i check on the switch port, the point that these devices disappear, all of these run cdp/lldp normally and i can see these devices connect with switch port normally.
Even so, on topology page still not show these devices.
P.S. disappear devices are C9300-48UN, CW9164I
