Snip... I would think that the reason to distinguish IP overlays from MPLS overlays is distinguish the scope of NV03 WG from L2VPN WG and L3VPN WG.
[Lucy] I disagree this assessment. L2VPN and L3VPN are virtualization and overlay technologies. Although they are often deployed on IP/MPLS networks now, it is not necessary. When MPLS is not available, using mpls in GRE encapsulation, L2VPN/L3VPN can be over an IP network, which fits in the NVO3 scope. Lucy
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