Return traffic - that's will be the problem for you. I guess you cannot map both inner- and outer-vlan-ids (1:N/1:N) to many on a single interface. It may be a little bit easier if you might have separate interface for each of PPPoE segments. In this case "output-vlan-map" command could helps you. But I'm sure you'll need to redesign your schema. Why do you use this strange logical mechanism?
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