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How to carry PPPoE over MPLS core?

I'm working on a deployment of a new ISP access network (see attached scheme). Everything is more or less OK except for I don't know what would be the best choice for transporting PPPoE VLANs to their termination point (BRAS). So far I'm thinking about configuring VPLS between the core (c7604 with RSP720C routing engine), BRASes and BRs. The problem is that I do not know how I should properly xconnect c7201 to the core so I can terminate PPPoE sessions and at the same time maintain full redundancy of the whole solution. I'd like to listen to your ideas regarding this matter, or may be there is a comprehensive tutorial somewhere where this subject is explaned in detail.

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