Andy, Zafar and Ruediger thanks for the feedback.

Another difference between (e) and (f) may be the timing of the disclosure:
- (f) is typically performed after Working Group last call, hence after the 
work in the WG
- (e) gives a chance to the WG and more generally the networking community to 
get this knowledge during the lifetime of the draft / WG work. (1)

Cheers,
Bruno

(1) Assuming this work is indeed done by the authors/WG and updated somewhat 
regularly.


From: Andrew G. Malis [mailto:[email protected]]
Sent: Tuesday, December 04, 2018 3:10 PM
To: Zafar Ali (zali)
Cc: DECRAENE Bruno TGI/OLN; SPRING WG List
Subject: Re: [spring] Implementation Requirement Policy

Zafar,

Actually, most WGs (to my knowledge as a WG chair) follow (f) rather than (e), 
and the implementation information is included in the writeup from the document 
shepherd to the IESG rather than in the draft itself. Note that the writeup is 
a public document and is, and to my knowledge, permanently retained in the 
datatracker.

I'm personally happy with either (e) or (f). Note that (e) rather than (f) 
shifts the work of gathering and documenting the implementation info from the 
WG chairs and/or document shepherd to the draft authors and editors.

Cheers,
Andy


On Tue, Dec 4, 2018 at 7:53 AM Zafar Ali (zali) 
<[email protected]<mailto:[email protected]>> wrote:
Hi Bruno and the WG,

I think option (e) is most reasonable and is something most documents already 
follow as part of the IETF publication process.

Thanks

Regards … Zafar


From: spring <[email protected]<mailto:[email protected]>> on 
behalf of "[email protected]<mailto:[email protected]>" 
<[email protected]<mailto:[email protected]>>
Date: Wednesday, November 21, 2018 at 2:35 AM
To: SPRING WG List <[email protected]<mailto:[email protected]>>
Subject: [spring] Implementation Requirement Policy

Hi SPRING,

As introduced during IETF 103, the IESG asked for each WG to discuss the 
Implementation Requirement Policy that they would like to use.

Below are typical examples of implementation requirement policy, but we are 
free to define our own:

  1.  require at least 2 interoperable implementations and detailed 
implementation reports
  2.  require x implementations documented in an Implementation Status Section 
(rfc7942)
  3.  require x implementations — no specific documentation needed
  4.  require x implementations, but the Chairs can make exceptions per-document
  5.  document known implementations in the Implementation Status Section 
(rfc7942)
  6.  the Chairs will ask about implementations
  7.  no requirement


Note that we are free to use any text, and in particular allow for exceptions 
in addition to a general rule.
Such policy would apply to documents in the SPRING WG. A protocol extension 
required for SPRING but adopted in another WG (e.g. LSR) would be subject to 
the policy of its WG (LSR).

This email starts a 4-weeks discussion on this.

Please voice your preference, and your reasoning.

Thanks,
--Bruno, Rob


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