Two wan ports:
Policy: Select all internal networks -> Select ip_any ->disable "use other wan port if this is down"-> WAN2
wan 2 is connected to a switch and the only other item in the switch is the uplink router
unplugging the router now makes the traffic still go over WAN1.
Expected behaviour since "use other wan port" was disabled: Clients have no internet anymore
(ofcourse i don't take away the router usually but whenever things get busy the tp link router starts to do load balancing rather than following his rules)