Hi all, It's well-known that MPLS encapsulation can be used in both Layer2 VPN overlay (e.g., MAC-in-MPLS-in-GRE) and Layer3 VPN overlay (e.g., IP-in-MPLS-in-GRE). Meanwhile, although NVGRE is targeted only for Layer2 VPN overlay (i.e., MAC over IP overlay) scheme at present, the protocol type field in the GRE header however provides a possibility of supporting Layer3 VPN overlay (i.e., IP over IP overlay) if needed in the future. However, as per the encapsulation format described in the current version of VXLAN draft, there is no such protocol type field in the VXLAN header yet. Hence I suggest the VXLAN co-authors could consider using some reserved bits as the protocol type field. In this way, the VXLAN encapsulation header could also be applicable to the Layer3 VPN overlay scheme if needed in the future.
Best regards, Xiaohu
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