Mix of ADSL and VDSL Interfaces

Dear Forums,

I searched thru some older topics, but seems this problem wasn't solved back when those threads were created.

Situation: I have two uplink devices with ADSL, which do run fine.

I have a new, additional uplink, which is a VDSL line. How do I set it up correctly? The provider requires an MTU of 1492 (that part is easy) and a VLAN Tagging ID of 2011.

If I understand the threads correctly, the VLAN Checkbox sets VLAN Tagging, but with a different ID. Is there a way to get this line up and running?

Thanks very much for your Input.