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The aggregation switch suddenly went offline

Under Network -> Interface, try disabling and re-enabling the FortiLink interface. Note: After the FortiGate device is upgraded from FortiOS 7. I turned on aggregation on both (1+2 on the USW Pro Aggregation and 51+52 on the USW Pro 48 PoE). Connected only ONE fiber cable between them (didnt even get to the second cable) and the USW Pro 48 PoE goes offline and I. In UniFi, “Offline” means the device hasn't checked in with the controller in a while. Most UniFi gear pings the controller regularly. If the controller doesn't hear back within a certain window, usually 1 to 2 minutes, it marks the device as offline. This subreddit is here to provide unofficial technical support to people. I have a udm pro, aggregation switch, and 48p 2. Have had a few times now whole network goes down.