Hi!
Is there a way to build a layer 2 redundant ring with routeros? This is often used with industrial equipment and switches where fast fail over is needed and (r)stp can't be used. I have used hirschman switches with their Hiper ring protocol in the past which basically send a test telegram around in the ring and if the telegram suddenly is missing on the other ring port than it was sent from, it activates switching on both ports but if the telegram is instead received on the blocking ring port it will continue to block other traffic on it and stops it from creating a loop.
Many industrial devices like PLCs, remote I/Os, variable speed drives and so on comes with dual switched ethernet ports for this but you need a "master" in the ring to handle the redundancy so a complete loop isn't formed.
Would be cool if this could be done with routeros :)