[Lsr] 答复: 【Request AD Step In】 Working Group Adoption of "IGP Unreachable Prefix Announcement" - draft-ppsenak-lsr-igp-ureach-prefix-announce-04

[Aijun Wang <[e-mail]>]

Hi, John:

Thanks for your reply.
The key concerns for the issue is that although https://datatracker.ietf.org/doc/draft-wang-lsr-prefix-unreachable-annoucement has several advantages, it hasn't been given the adoption call until now. This is unfair and also our main appeal reason.

Considering there are two different approaches to solve some overlapping scenarios, I think we can consider to adopt both of them as WG documents, similar with actions of other WGs.
We can let the industry to select the final solution to implement and deploy within their networks.

We have enough energies to accomplish the final implementation and deployment.

Some detail responses are inline below.


Best Regards

Aijun Wang
China Telecom

-----邮件原件-----
发件人: [e-mail] [mailto:[e-mail]] 代表 John Scudder
发送时间: 2023年11月1日 6:02
收件人: Aijun Wang <[e-mail]>
抄送: lsr <[e-mail]>; [e-mail]
主题: Re: [Lsr] 【Request AD Step In】 Working Group Adoption of "IGP Unreachable Prefix Announcement" - draft-ppsenak-lsr-igp-ureach-prefix-announce-04

Hi Aijun,

I apologize for the length of time it’s taken me to respond to your request. 

Having now taken the time to study the question properly, including a review of both drafts in question, the WG adoption call, and the subsequent email, here’s my take.

In large part, your position appears to be based on historical precedence — your draft was published first. (This is your “follower solution… initiator” in the email I’m responding to, as well as the first three “which draft is the first” points in your follow-up.) This is true of course. Furthermore, although our formal process does not take into account such questions as “who came first?” I think it would be safe for me to say that people generally do try to do not just what’s required, but what’s right, in terms of acknowledging prior work. For this reason, I was a little surprised to see no acknowledgment of the contributions of your draft in draft-ppsenak. But I think such an acknowledgment — which is a norm, not a requirement — is the most you can expect for having published the first draft that covers the same general subject area as draft-ppsenak. This might also be a good time to remind you that draft-wang-lsr-prefix-unreachable-annoucement-00 includes the statement,

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

I encourage you to review BCP 78 if you haven’t recently.
【WAJ】In contrast, we include the above statement from the version 00: https://datatracker.ietf.org/doc/html/draft-wang-lsr-prefix-unreachable-annoucement-00, and also acknowledge the comments from Peter Psenak, Les Ginsberg, Bruno Decraene, Acee Lindem, Shraddha Hegde, Robert Raszuk, Tony Li, Jeff Tantsura and Tony Przygienda for their suggestions and comments on draft-wang.

In short, I’m not persuaded by the first-to-publish argument.
【WAJ】We are not advocating the fist-to-publish argument, but the first should be considered first for adoption call, or else, there must be reasonable explanations for not doing so.

The other major point made by you, and others advocating for the consideration of draft-wang as the WG solution and against draft-ppsenak, is that draft-wang is said to cover more cases. (This is “cover more scenarios” in your email, as well as point five, “cover more scenarios” in your follow-up.) There was some spirited debate about whether the draft does so successfully, or not, but I don’t want to take a position on that in this email. Rather, what I observe is that since these points were made clearly, and repeatedly, in the WG adoption email thread as well as at other times previously, it can’t be argued that the WG didn’t know that draft-wang claims to address (for example) area partition, and that draft-ppsenak explicitly doesn’t. So, this suggests those who supported the adoption of draft-ppsenak either implicitly, or explicitly, believed that the additional use cases draft-wang claims to address are not important. At least, not important to address in this draft, at this time, as part of this adopted WG work.
【WAJ】Prefix unreachable announcement is one general mechanism, the solution shouldn't be limited only on some narrow scopes. For standardization work, we should look further.

In your follow-up, you also proposed that “which explicit signaling mechanism is simpler” should be a criterion (point four). In my experience, this kind of question seldom leads to a useful outcome since it’s so subjective. I will say however that many of the people who responded to the WG adoption call made it clear they had such considerations in mind, so I think there is good reason to think the WG has taken this question into account.
【WAJ】The adoption call is issued only for one approach, not both of them, then how can we get the above conclusions?

I also want to speak to the questions of whether the WG adoption decision was too hasty, whether there should be more deliberation in the WG, and whether there should have been a separate adoption call for draft-wang, which are points you’ve made emails other than the one I’m replying to. Regarding whether it was too hasty — as you say in this email, this work has been in progress since 2019. The merits of the solutions have been debated extensively. A considerable amount of valuable WG meeting time has been devoted to these discussions, as well as a great many emails. It’s hard for me to see the WG adoption decision as being made without due deliberation — the opposite if anything. Regarding whether there should have been an adoption call for draft-wang — our process allows considerable latitude to WG chairs in how they choose to run these things. In reviewing this adoption call, it seems to me that all participants were clear that in practice and regardless of what the subject line was, they were really addressing a multi-part question: should the WG work on this area? If so, should the base document be draft-ppsenak, or draft-wang? These questions received a full airing, as far as I can tell.
【WAJ】draft-wang hasn't been given the chances for adoption call after near 3 years discussions, but draft-ppsenak was given the chance in hurry within one year. Isn't it too hastly for draft-ppsenak?

As you know, the IETF runs on “rough consensus”. This is true for WG adoptions just as for anything else, and it sometimes requires WG chairs to make hard decisions to call a consensus where some WG contributors are “in the rough”. After reviewing the WG adoption call, drafts, and history, it appears to me that the WG chairs have listened to all the positions put forward and considered them, and judged the rough consensus to favor the adoption of draft-ppsenak. I don’t see sufficient evidence to make me believe I should overrule the WG chairs’ judgment.

Finally, I will point out that you have many options still open to you if you strongly feel that the scenarios that are not covered by the adopted document are crucial. 
【WAJ】The most acceptable option is to adopt draft-wang also as WG document, because they take different approaches to solve some overlapping scenarios. Let's the industry to select the suitable solution based on their own judgements.

Thanks for your patience as I investigated this matter,

—John

P.S.: As I’ve reviewed the adoption call and subsequent discussion, I’ve noticed that tempers have grown a little heated at times. I’d like to remind all participants that BCP 54, Guidelines for Conduct, cautions us among other things that "IETF participants extend respect and courtesy to their colleagues at all times” and "IETF participants have impersonal discussions”, and ask that we keep these guidelines in mind.

> On Sep 14, 2023, at 6:38 AM, Aijun Wang <[e-mail]> wrote:
> 
> Hi, Acee:
> 
> I admire your efforts for the LSR WG, but for the adoption call of this draft, you have not convinced me, although I gave you large amount of solid facts.
> Then, it's time to let our AD to step in, to make the non-biased judgement, based on our discussions along the adoption call.
> 
> We request the WG document be based on the https://urldefense.com/v3/__https://datatracker.ietf.org/doc/draft-wang-lsr-prefix-unreachable-annoucement/__;!!NEt6yMaO-gk!EzMeDOJ2CKQMN5BjyxXnXhjJdOHPCa5wJqBo4AHwGRRhiwl1lIneQoxBdHDm1d58PO0NM7tu7IQ4ULrpAq_7Zw$ , because it is the first document to initiate the use case, provide the explicit signaling mechanism, and cover more scenarios.
> 
> It’s unreasonable to adopt the follower solution and ignore the initiator. We started and lead the discussions THREE years earlier than the current proposal.
> 
> Aijun Wang
> China Telecom
> 
>> On Sep 8, 2023, at 23:16, Acee Lindem <[e-mail]> wrote:
>> 
>> The WG adoption call has completed and there is more than sufficient support for adoption.
>> What’s more, vendors are implementing and operators are planning of deploying the extensions.
>> Please republish the draft as draft-ietf-lsr-igp-ureach-prefix-announce-00.
>> 
>> A couple of WG members, while acknowledging the use case, thought that it would be better satisfied outside of the IGPs.
>> In fact, they both offered other viable alternatives. However, with 
>> the overwhelming support and commitment to implementation and 
>> deployment, we are going forward with WG adoption of this document. As the Co-Chair managing the adoption, I don’t see this optional mechanism as fundamentally changing the IGPs.
>> 
>> There was also quite vehement opposition from the authors of 
>> draft-wang-lsr-prefix-unreachable-annoucement. This draft purports to 
>> support the same use case as well as others (the archives can be 
>> consulted for the discussion). Further discussion of this other draft 
>> and the use cases it addresses should be in the context of 
>> draft-wang-lsr-prefix-unreachable-annoucement
>> and not the WG draft.
>> 
>> Thanks,
>> Acee
>> 
>>> On Aug 23, 2023, at 3:58 PM, Acee Lindem <[e-mail]> wrote:
>>> 
>>> LSR Working Group,
>>> 
>>> This begins the working group adoption call for “IGP Unreachable Prefix Announcement” - draft-ppsenak-lsr-igp-unreach-prefix-announce-04.
>>> Please indicate your support or objection on this list prior to September 7th, 2023.
>>> 
>>> Thanks,
>>> Acee
>> 
>> 
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>> __;!!NEt6yMaO-gk!EzMeDOJ2CKQMN5BjyxXnXhjJdOHPCa5wJqBo4AHwGRRhiwl1lIne
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> 

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