On 5/2/17, 12:57 PM, "Stewart Bryant" <stewart.bryant@xxxxxxxxx> wrote: Stewart: Hi! How are you? Thanks for the detailed review! > A significant part of the justification seems to evolve around the > inability of MPLS to function in an IPv6 only network. It seems to me that this statement summarizes many of the concerns you listed as Major in the review. I can see why it seems like the justification is: “because MPLS doesn’t work, then we have to do IPv6.” – but I think that even if a complete solution exists (for an MPLS deployment on an IPv6-only network), some operators would still make the design choice of preferring an IPv6-only deployment. I think that it would be good for the authors to refocus the justification away from “because X doesn’t work”. Would that address this part of your concerns? Thanks! Alvaro.