I have two APs on a LAN (ether1), with an nstreme dual link (nstreme1) set up between them. On each box, I create an RSTP enabled bridge with two ports: ether1 and nstreme1. The bridge on the first AP has a lower priority, so it is the root bridge, and its two ports are listed as designated ports. The bridge on the second AP has a higher priority, and one of its ports (in this case, nstreme1) is listed as the root port.
The problem is, I would expect RSTP to disable the other port, but it leaves it as a designated port, resulting in a loop. I have to physically unplug one of the APs from the LAN, or manually disable the nstreme dual link, to avoid a storm on the LAN. Why isn’t RSTP disabling one of the ports?
This is between two RB532a’s running RouterOS 3.16.