I recently had the privilege of upgrading the office LAN at the small startup where I work from a hodgepodge of unmanaged switches to Cisco 2960s. We had been noting degraded performance and switches crashing for a number of weeks, and had been unable to rectify the issue.
When I upgraded the switches, I began seeing alerts from the STP system indicating bridge loops. After going through devices one-by-one at a downstream (still unmanaged) switch I was able to trace it to the UniFi access points.
There is a very misleadingly named option in the UniFi web UI: "Enable Connectivity Monitor and Wireless Uplink". The "Wireless Uplink" feature is what ended up failing us, by incorrectly determining that the uplink was malfunctioning, therefore creating a virtual bridge for all LAN traffic between the two APs.
Upon disabling this feature, all bridging loops disappeared and the network behaved normally.
Thanks Ubiquiti!
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