hey,
I assume you have a star-network below the BNG? Ie no rings or similar in the access network?
Most of our network below BNG is MPLS, so no, it's not a star per say. But as PWs are point-to-point, you are technically correct. Below MPLS there is some ethernet too and this is all strictly star/tree.
I would encourage everyone to push MPLS as close to customer as possible, this makes redundancy, BNG placement etc. all much easier as you can use IGP/MPLS + PWs.
-- tarko
