Topology map stopped working
As previously reported by other people in older threads (that have now been "locked" without any solution), the "Topology" map on our OC200 controller has suddenly stopped working altogether, displaying the generic "No devices found" error. It had been working fine, albeit occasionally showing the hierarchy incorrectly, but we can live with that.
Every other part of the system is still working, including the "Devices" tab, which shows all devices connected and fully under controller management. The problem is consistent whether using the cloud view or directly accessing the controller on the LAN.
As a last resort I've rebooted the controller - with no effect.
Does anybody know what the real problem is, and how to fix it? The only significant recent change was to enable [R]STP between switches - which of course we can't just disable without risking the stability of the network.