Hi all,

Based on the email below and the received feedback we have published a new 
revision of draft-ietf-spring-srv6-network-programming.
This new version only introduces changes in the PSP section. Those changes are 
editorial changes destined to simplify the reading of the aforementioned 
section.
The diff does not change the specification of the behavior.

Please read and comment.
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-11#section-4.16.1

Thanks,
Pablo.

From: "bruno.decra...@orange.com" <bruno.decra...@orange.com>
Date: Friday, 28 February 2020 at 18:19
To: draft-ietf-spring-srv6-network-programming 
<draft-ietf-spring-srv6-network-programm...@ietf.org>, "Pablo Camarillo 
(pcamaril)" <pcama...@cisco.com>
Cc: Brian E Carpenter <brian.e.carpen...@gmail.com>, 'SPRING WG List' 
<spring@ietf.org>
Subject: RE: WGLC - draft-ietf-spring-srv6-network-programming
Resent from: <alias-boun...@ietf.org>
Resent to: <c...@cisco.com>, <pcama...@cisco.com>, <j...@leddy.net>, 
<daniel.vo...@bell.ca>, <satoru.matsush...@g.softbank.co.jp>, 
<lizhen...@huawei.com>
Resent date: Friday, 28 February 2020 at 18:19

Pablo, authors, WG,

Section 4.16.1 [1] is the subject of multiple comments and clarification 
questions. Most notably some comments from Brian.

Its current text is very focused on the technical specification. Technical 
specification is good and this is the primary objective to achieve 
interoperability. But some would say that it is a bit terse, especially given 
the amount of context behind it. So I think that it could benefit from some 
introduction text.

Could you work on some text to better introduce PSP and put it in context? 
Possibly working with Brian who is kind enough to work on improving the clarity 
of this section for everyone.
Quoting Brian “simply need more explanation in elementary terms”.

I personally have a few points in mind:

-          Clarifying what “Penultimate” refers to. This is required as there 
are multiple reading such “penultimate IPv6/SRv6 transit node” (which we all 
agree is not allowed by RFC 8200, so let’s make things clear that the document 
is not talking or suggesting or allowing this) or “penultimate SR Segment 
Endpoint Node indicated in the IPv6 destination address of the received IPv6 
header”.

-          Clarify what you mean by “Pop”. (as this terminology is heavily 
borrowed from MPLS and may not be crystal clear for everyone, especially since 
the MPLS RFC is not a normative reference (and it should not be))

-          Clarify that given the nodes A—B—C,  the PSP flavor is done by 
penultimate Segment Endpoint “B” at the request of the IPv6 source node “A” as 
an outsourced service from the ultimate SR End Point “C”. “A”, “B” and “C” been 
within the same control domain.

Agreed that this is not changing anything in the spec, and may be obvious to 
you, and hopefully clear for people having read the relevant document, however 
from the comments it seems clear that some additional context may help to 
clarify. Also it’s plausible that some persons may only read this specific PSP 
section and react on it.

Thank you,
--Bruno

[1] 
https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-10#section-4.16.1


From: ipv6 [mailto:ipv6-boun...@ietf.org] On Behalf Of bruno.decra...@orange.com
Sent: Thursday, December 5, 2019 6:15 PM
To: 'SPRING WG List'
Cc: 6...@ietf.org; draft-ietf-spring-srv6-network-programming
Subject: WGLC - draft-ietf-spring-srv6-network-programming


Hello SPRING,



This email starts a two weeks Working Group Last Call on 
draft-ietf-spring-srv6-network-programming [1].



Please read this document if you haven't read the most recent version, and send 
your comments to the SPRING WG list, no later than December 20.



You may copy the 6MAN WG for IPv6 related comment, but consider not duplicating 
emails on the 6MAN mailing list for the comments which are only spring 
specifics.



If you are raising a point which you expect will be specifically debated on the 
mailing list, consider using a specific email/thread for this point.

This may help avoiding that the thread become specific to this point and that 
other points get forgotten (or that the thread get converted into parallel 
independent discussions)



Thank you,

Bruno



[1] https://tools.ietf.org/html/draft-ietf-spring-srv6-network-programming-05




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