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Re: [sfc] I-D Action: draft-ietf-sfc-nsh-ecn-support-06.txt

Donald Eastlake <d3e3e3@gmail.com> Mon, 13 September 2021 20:56 UTC

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From: Donald Eastlake <d3e3e3@gmail.com>
Date: Mon, 13 Sep 2021 16:56:01 -0400
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Subject: Re: [sfc] I-D Action: draft-ietf-sfc-nsh-ecn-support-06.txt
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This revision has minor wording improvements.

To my mind there is one substantial issue with this draft: What to do
about SFs that add or remove packets from a flow or lengthen or
shorten such packets. If this is ignored, the document is much less
useful for such flows. The simplest solution seems to be that such SFs
should optionally signal forward in separate packets the changes they
have made, of this sort, to flows. I plan to look into adding such a
facility.

Thanks,
Donald
===============================
 Donald E. Eastlake 3rd   +1-508-333-2270 (cell)
 2386 Panoramic Circle, Apopka, FL 32703 USA
 d3e3e3@gmail.com

On Mon, Sep 13, 2021 at 4:06 PM <internet-drafts@ietf.org> wrote:
>
>
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
> This draft is a work item of the Service Function Chaining WG of the IETF.
>
>         Title           : Explicit Congestion Notification (ECN) and Congestion Feedback Using the Network Service Header (NSH) and IPFIX
>         Authors         : Donald E. Eastlake
>                           Bob Briscoe
>                           Yizhou Li
>                           Andrew G. Malis
>                           Xinpeng Wei
>         Filename        : draft-ietf-sfc-nsh-ecn-support-06.txt
>         Pages           : 33
>         Date            : 2021-09-13
>
> Abstract:
>    Explicit congestion notification (ECN) allows a forwarding element to
>    notify downstream devices of the onset of congestion without having
>    to drop packets. Coupled with a means to feed information about
>    congestion back to upstream nodes, this can improve network
>    efficiency through better congestion control, frequently without
>    packet drops. This document specifies ECN and congestion feedback
>    support within a Service Function Chaining (SFC) architecture domain
>    through use of the Network Service Header (NSH, RFC 8300) and IP Flow
>    Information Export (IPFIX, RFC 7011).
>
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-sfc-nsh-ecn-support/
>
> There is also an htmlized version available at:
> https://datatracker.ietf.org/doc/html/draft-ietf-sfc-nsh-ecn-support-06
>
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-ietf-sfc-nsh-ecn-support-06
>
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>
>
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