Loop Detected By Switch

RouterOS General
1

I’ve got a hAP ac lite managed by someone else, I currently don’t have the management password..
When I connect a switch with loop detection (TL-SG108E), the switch detects a loop.
The only network connection is between the switch and the router and I’m wondering, how is it possible to have a loop?
I’m not familiar with RouterOS and not having the password doesn’t help, but I’m just wondering what could be wrong here.

https://www.tp-link.com/nl/business-networking/unmanaged-pro-switch/tl-sg108e/

2

The device that detects the loop is most probably the device that is not causing the Loop.
So there is possibly a loop somewhere else in the network…

3

But there’s only the router, the switch and WiFi clients.. there’s only a single cable in the entire network, between the router and the switch. Where is the loop hiding?

4

One of the ports of the router seemed broken. It detected a cable when no cable was connected.

5

Oops…