thats why i posted. I was seeing some stuff about vlans but i didnt wanna go gung ho on something if i was going in the wrong direction.
So what policy should i be using to reach my goal?
The AP that is supposed to go against ISP1 implements one distinct subnet, such 10.0.0.0/24. The AP that is going to go against ISP2 implements another subnet, such as 10.0.1.0/24.
On the router that terminates the ISP connections make mangle rules that set routing-marks depending on the source IP address - if the source IP is in 10.0.0.0/24 set a routing mark for ISP1, if the source IP is in 10.0.1.0/24 set a routing mark for ISP2.
Then install routes in the routing table for the two marks, pointing out to the appropriate ISP.