[v6ops] transition-ipv4aas: positioning the draft

["STARK, BARBARA H" <[e-mail]>]

I have a number of comments for draft-palet-v6ops-transition-ipv4aas. I'm grouping comments under different email subject headers so it's easier to track the topic of any resulting discussion.

The first area of comments I have is on how to position this draft relative to RFC 7084 and in a way that will maximize its impact and likelihood of achieving its goal (which I think is to drive availability of CE routers that support *all* of the included transition technologies).

I notice the draft introduces the term "IPv6 transition CE". Sometimes this is "IPv6 transition CE router". I like this idea, but would suggest capitalizing and using the longer "IPv6 Transition CE Router". I think if this is a more formal term and this draft is positioned as defining requirements for an IPv6 Transition CE Router (rather than simply specifying "the transition requirements for an IPv6 Customer Edge (CE) router") then it becomes ok to make most of the SHOULD requirements into a MUST. That is, the draft is not an extension of a CE Router (RFC 7084). It's something new that is specified and defined here. And should be the title of the draft.

Saying "MUST" is stronger than "SHOULD" and will increase likelihood of success. It will also increase likelihood that *all* of the included technologies are implemented (as currently written it would be possible to do one or 2 of the technologies and still claim compliance). And it will make it easier to create a subsequent certification program, if there is demand for one. If the MUST statements apply only to the IPv6 Transition CE Router this draft defines, then there is no problem with saying "MUST". The requirements have no scope outside this draft.

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If taking this approach, requirements for DS-Lite would need to be included. Those can be copied from RFC 7084.

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RFC 7084 can still be a basis for this new thing (MUST comply with RFC 7084).

The current requirement for RFC 7084 compliance is "The IPv6 Transition CE router must comply with all the requirements stated in [RFC7084]." 
I suggest staying away from "all the requirements", since the RFC 7084 SHOULD and MAY requirements are also requirements, and I don't think it's intended to mandate those. I recommend simply saying:
The IPv6 Transition CE router MUST comply with [RFC7084].

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If done this way, I don't think it's necessary to make mention of 6rd in any way. It's omission from this draft will make it clear that it's not a component of an IPv6 Transition CE Router.


Barbara