． RFC6204 (Basic Requirements for IPv6 Customer Edge Routers) * => RFC7084 and requires CE-Router Logo <image001.png>
the delta between 6204 and 7084 is largely the addition of the 6rd and DS-lite. since 7084 was published quite a lot has happened on new mechanisms for IPv4 address sharing. e.g. MAP. I would think 554bis should take those into account as well.
This is an interesting discussion. MAP and LW4o6 would be interesting mechanisms to require support for, absolutely. I am not sure how much of the control plane for these mechanisms that are actually done and in published RFCs yet, but will look into it!
It's hard to require support for something that might not be 100% done and deployable using available RFCs, even though there are multiple implementations of these already.
the MAP and LW4o6 document series are stable and should be published as RFCs real soon now. all are at "Approved - announcement to be sent". https://datatracker.ietf.org/images/iesg-draft-state-diagram.png there are at least eight IETF solutions (L2TP, DS-lite, 464XLAT, Public 4over6, Lightweight 4over6, 4rd, MAP-T, MAP-E) to the same problem (IPv4 or shared IPv4 over IPv6). it's going to be interesting to figure out how 554bis should deal with that. cheers, Ole