Re: [spring] WGLC - draft-ietf-spring-srv6-network-programming

"Pablo Camarillo (pcamaril)" <pcamaril@cisco.com> Mon, 02 March 2020 16:52 UTC

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From: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
To: "spring@ietf.org" <spring@ietf.org>
CC: Brian E Carpenter <brian.e.carpenter@gmail.com>, "bruno.decraene@orange.com" <bruno.decraene@orange.com>
Thread-Topic: WGLC - draft-ietf-spring-srv6-network-programming
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Subject: Re: [spring] WGLC - draft-ietf-spring-srv6-network-programming
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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.decraene@orange.com" <bruno.decraene@orange.com>
Date: Friday, 28 February 2020 at 18:19
To: draft-ietf-spring-srv6-network-programming <draft-ietf-spring-srv6-network-programming@ietf.org>rg>, "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
Cc: Brian E Carpenter <brian.e.carpenter@gmail.com>om>, 'SPRING WG List' <spring@ietf.org>
Subject: RE: WGLC - draft-ietf-spring-srv6-network-programming
Resent from: <alias-bounces@ietf.org>
Resent to: <cf@cisco.com>om>, <pcamaril@cisco.com>om>, <john@leddy.net>et>, <daniel.voyer@bell.ca>ca>, <satoru.matsushima@g.softbank.co.jp>jp>, <lizhenbin@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-bounces@ietf.org] On Behalf Of bruno.decraene@orange.com
Sent: Thursday, December 5, 2019 6:15 PM
To: 'SPRING WG List'
Cc: 6man@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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