[Lsr] 答复: Working Group Adoption of "IGP Unreachable Prefix Announcement" - draft-ppsenak-lsr-igp-ureach-prefix-announce-04

[Aijun Wang <[e-mail]>]

Hi, Acee:

 

AGAIN, before making some assertions, please check the following fact:

Have you noticed the 00 version of https://datatracker.ietf.org/doc/draft-ppsenak-lsr-igp-event-notification/ was submitted on July 5, 2021?

But the description about the short lived notification in https://datatracker.ietf.org/doc/html/draft-wang-lsr-prefix-unreachable-annoucement-06#section-7 was on March 26, 2021.

Then, which draft was the first?

 

For the adoption call or merge efforts, I think the WG should consider the following facts:

1)     Which draft is the first to provide the use cases? 

2)     Which draft is the first to propose explicit signaling for unreachable information?

3)     Which draft is the first to propose short lived notification?

4)     Which explicit signaling mechanism is simpler?

5)     Which draft provides more mechanisms to cover more scenarios?

 

The base document should be selected based on the answers of the above questions. 

Select the base document doesn’t mean that it can’t be changed before the adoption(I haven’t said “Without Change” is the merge condition). 

Actually, we welcome more authors to join us to finalize the document and solution.

 

As one of the most important WG within IETF, I think LSR WG should respect the original contributions to the WG.

It is too hurry to consider or adopt only the draft that you prefer, especially the follower draft.

 

Best Regards

 

Aijun Wang

China Telecom

 

发件人: [e-mail] [mailto:[e-mail]] 代表 Acee Lindem
发送时间: 2023年9月6日 0:56
收件人: Aijun Wang <[e-mail]>
抄送: Robert Raszuk <[e-mail]>; Les Ginsberg (ginsberg) <ginsberg=[e-mail]>; Huzhibo <huzhibo=[e-mail]>; Peter Psenak <[e-mail]>; linchangwang <[e-mail]>; lsr <[e-mail]>
主题: Re: [Lsr] Working Group Adoption of "IGP Unreachable Prefix Announcement" - draft-ppsenak-lsr-igp-ureach-prefix-announce-04

 

 

Hi Aijun, 

 

When the WG discussion first indicated that this was a use case that needed to be addressed, I don’t dispute that you immediately added it to your draft. 

I have no doubt you would have purported support of any use case under discussion. 

 

However, the first draft to address this use case with a short-lived notification was  https://datatracker.ietf.org/doc/draft-ppsenak-lsr-igp-event-notification/

Based on WG feedback and collaboration of multiple vendors, this draft evolved to draft-ppsenak-lsr-igp-ureach-prefix-announce. 

 

While you’ve incorporated elements of the draft under discussion, your draft still includes pieces (sometimes conflicting) from previous use cases.

 

There was an effort to merge the drafts but you declined unless your draft was used (without change) as the base. I’m not sure your motivation. 

 

Thanks,

Acee

 

 





On Sep 1, 2023, at 20:25, Aijun Wang <[e-mail] <mailto:[e-mail]> > wrote:

 

Hi, Acee:

 

Act as LSR chair, I think you should be more responsible to make any unfounded assertions:

 

We have described the previous statements in

https://datatracker.ietf.org/doc/html/draft-wang-lsr-prefix-unreachable-annoucement-06#section-7, March 26, 2021, one year before the 00 version of draft-ppsenak(March 25,2022)

 

Then, which draft copy or incorporate which draft?

 

Aijun Wang

China Telecom





On Sep 1, 2023, at 20:05, Acee Lindem <[e-mail] <mailto:[e-mail]> > wrote:

Hi Aijun, 





On Aug 31, 2023, at 23:36, Aijun Wang <[e-mail] <mailto:[e-mail]> > wrote:

 

Hi，Acee:

 

Please read  <https://datatracker.ietf.org/doc/html/draft-wang-lsr-prefix-unreachable-annoucement-12#section-7> https://datatracker.ietf.org/doc/html/draft-wang-lsr-prefix-unreachable-annoucement-12#section-7 before making misguide assertions:

 

“The advertisement of PUAM message should only last one configurable period to allow the services that run on the failure prefixes are switchovered.”

 

 

I guess I haven’t kept up with all the elements of the draft under adoption that you continue to incorporate into your draft. This has been a continuing theme since initial discussed of the application signaling use case. While I have no interest in improving your draft, making the LSP/LSA short-lived conflicts with the other scenarios your draft purports to address. 

 

Acee

 





 

Best Regards

 

Aijun Wang

China Telecom

 

发件人:  <mailto:[e-mail]> [e-mail] [ <mailto:[e-mail]> mailto:[e-mail]] 代表 Acee Lindem
发送时间: 2023年9月1日 0:50
收件人: Robert Raszuk < <mailto:[e-mail]> [e-mail]>
抄送: Les Ginsberg (ginsberg) < <mailto:ginsberg=[e-mail]> ginsberg=[e-mail]>; Huzhibo < <mailto:huzhibo=[e-mail]> huzhibo=[e-mail]>; Peter Psenak < <mailto:[e-mail]> [e-mail]>; linchangwang < <mailto:[e-mail]> [e-mail]>; lsr < <mailto:[e-mail]> [e-mail]>
主题: Re: [Lsr] Working Group Adoption of "IGP Unreachable Prefix Announcement" - draft-ppsenak-lsr-igp-ureach-prefix-announce-04

 

 






On Aug 31, 2023, at 12:32, Robert Raszuk < <mailto:[e-mail]> [e-mail]> wrote:

 

Hi Acee,

 

In any case, one will need to update the signaling routers and the routers acting on the signal. 

 

I guess this is clear to all. 

 

Additionally, your request for the adoption was that the draft have a stronger statement about the mechanism being used for solely for signaling for applications (e.g., BGP PIC).

 

As to the applicability my comment was that either draft should state in strong normative language that this is applicable only to applications which data plane uses encapsulation to the next hop. 

 

Said this draft-wang introduces the additional signalling, sort of trying to assure that all nodes in an area understand the new messages - but I am not sure if even advertising PUAM capability means that it will be actually used for all destinations ? 

 

No - but while the draft under adoption (ppsenak-lsr…) is for an ephemeral signal which the WG agreed was a valid use case, in the other draft, the LSAs are long-lived and are also may be used for other purposed than signaling (e.g., reread both sections 4 and 6 of draft-wang-lsr…). This draft starting with a whole different use case but selectively added mechanisms from ppsenak-lsr… 

 

I seem to recall you were a strong proponent of limiting the scope. 

 






 

By responding to this Email inline, some may believe you support the assertion that we should start the adoption of both drafts. Please be clarify this.

 

Well the way I see this is that adoption call is a bit more formal opportunity for WG members to express their opinion on any document. But maybe LSR (for good reasons) have different internal rules to decide which document should be subject to WG adoption and does sort of pre-filtering. 

 

If adoption call proves document has negative comments or lacks cross vendor support it simply does not get adopted. 

 

Maybe I am just spoiled looking at how IDR WG process works :-) 

 

You replied to an Email inline suggesting adoption of both drafts. That is what I think could have been misconstrued - especially by those who didn’t follow the discussion until now who think you are agreeing with this recommendation.  

 






 

As for your other comment that this could be accomplished with BGP or an out-of-bound mechanism, that is true but that could be true of many problem. However, the solution under adoption has running code and wide vendor support.

 

 Right ... As I wrote to Peter - perhaps this is just a pragmatic approach and flooding is what link state uses so be it. 

 

As you know I did try in the past to propose BGP Aggregate withdraw but then feedback of the community was that PEs do not go down that often to justify the extension. 

 

Hmm… We seem to have broad support for the LSR application signaling use case. 

 

Thanks,

Acee

 






 

Best,

Robert

 

 

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