A few years before MPLS/VPN was invented, I’d worked with a service provider who wanted to offer L3-based (peer-to-peer) VPN service to their clients. Having a single forwarding table in the PE-routers, they had to be very creative and used ACLs to provide customer isolation (you’ll find more details in the Shared-router Approach to Peer-to-peer VPN Model section of my MPLS/VPN Architectures book).
Now, what does that have to do with OpenFlow, SDN, Floodlight and Quantum?
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