Beware of Change regarding BDPU and Bridge Mode!
In the past, STP on Mikrotik was not behaving well with Cisco Switches an PVSTP and Vlans. The solution was to disable STP on the Mikrotik to make it a transparent switch.
BDPU from one Cisco would be flooded throught the Microtik Bridge to the other Switch in the ring and the Cisco would set a port to ‘blocking’.
After Upgrading to 7.16 BDPU flooding with disabled STP does not seem to happen anymore. This results in broadcast looping!
I had to enable STP on the Mikrotik Bridge to stop the loop.