This is the area of RouterOS configurations where I would say I'm not very proficient. So the question is:
Is there a way to configure a routing policy in RouterOS so that, when an upper bound of the bandwidth is reached - the excess traffic is routed over another outbound interface?

You could write a script and use the traffic monitor as the trigger, but no, there is not a simple way to do it.

You could write a script and use the traffic monitor as the trigger, but no, there is not a simple way to do it.

I guess I would be able to mangle the excess traffic then and route only excess to the secondary outbound interface. That's a nice idea. Thank you.

i think you should go for loadbalancing in which you can define the priority to specified interface(wan) . some other benefits also you will get



need karma if i helped you

Refer to this presentation by Tomas Kirnak:
http://mum.mikrotik.com/presentations/US12/tomas.pdf

This explains bandwidth based load balancing using some bandwidth monitoring and policy routing.

Thank you babbage, I've just seen your post. That presentation looks quite interesting indeed.