On a MT Router I have bridged ether1,ether2,ether3.

There are two DSL-Modems on ether1 and ether2.

I have created a PPPoE Client to dial up with my ISP1 and choose ether1 as interface.
I have created another PPPoE Client to dial up with my ISP2 and choose ether2 as interface.

From ether3 I want to be able to access the router.

My question: is it possible in this setup, that the one PPPoE Client uses the "wrong" DSL Modem to dial up? This I have to prevent but I am not sure, because both interfaces are in a bridge.