Hi authors,

Can you please review the document? There are a few other documents waiting
for the publication of this one.

Thanks,
Yingzhen

On Fri, Sep 19, 2025 at 1:11 PM Kaelin Foody <[email protected]>
wrote:

> Hi Bruno, all,
>
> Bruno: Thank you for your response. We have updated your location in the
> document as requested.
>
> Daniel: We have updated your email address in our database. Would you like
> your email and company to be updated in the document as well?
>
> We will await responses to our document-specific questions prior to moving
> this document forward in the publication process; we have included these
> questions at the end of this email for your convenience.
>
> — FILES (please refresh): —
>
> The updated files have been posted here:
> https://www.rfc-editor.org/authors/rfc9855.txt
> https://www.rfc-editor.org/authors/rfc9855.pdf
> https://www.rfc-editor.org/authors/rfc9855.html
> https://www.rfc-editor.org/authors/rfc9855.xml
>
> The relevant diff files have been posted here:
> https://www.rfc-editor.org/authors/rfc9855-auth48diff.html (AUTH48
> changes only)
> https://www.rfc-editor.org/authors/rfc9855-auth48rfcdiff.html (AUTH 48
> changes side by side)
> https://www.rfc-editor.org/authors/rfc9855-diff.html (all changes)
> https://www.rfc-editor.org/authors/rfc9855-rfcdiff.html (all changes side
> by side)
>
> The AUTH48 status page for this document is available here:
> https://www.rfc-editor.org/auth48/rfc9855
>
> Thank you,
>
> Kaelin Foody
> RFC Production Center
>
> > On Sep 17, 2025, at 5:12 AM, [email protected] wrote:
> >
> > Greetings,
> >
> > Thanks Kaelin.
> > Looks good.
> >
> > One more minor point
> >
> > OLD:
> >   Bruno Decraene
> >   Orange
> >   Issy-les-Moulineaux
> >   France
> >
> > NEW:
> >   Bruno Decraene
> >   Orange
> >   France
> >
> >
> > (at minimum, this is not my current location. Plus I'm not quite sure
> that indicating the city is quite useful for such a small country).
> >
> > --Bruno
> > -----Original Message-----
> > From: Kaelin Foody <[email protected]>
> > Sent: Wednesday, September 10, 2025 5:38 PM
> > To: DECRAENE Bruno INNOV/NET <[email protected]>
> > Cc: [email protected]; [email protected]; [email protected];
> [email protected]; [email protected];
> [email protected]; [email protected]; [email protected];
> [email protected]; [email protected]; [email protected];
> danvoyerwork <[email protected]>
> > Subject: Re: AUTH48: RFC-to-be 9855
> <draft-ietf-rtgwg-segment-routing-ti-lfa-21> for your review
> >
> >
> --------------------------------------------------------------------------------------------------------------
> > CAUTION : This email originated outside the company. Do not click on any
> links or open attachments unless you are expecting them from the sender.
> >
> > ATTENTION : Cet e-mail provient de l'extérieur de l'entreprise. Ne
> cliquez pas sur les liens ou n'ouvrez pas les pièces jointes à moins de
> connaitre l'expéditeur.
> >
> --------------------------------------------------------------------------------------------------------------
> >
> > Greetings,
> >
> > Bruno: Thank you for your comments. We have updated the document
> accordingly.
> >
> > Daniel: We have updated your email address in our database. Would you
> like your email and company to be updated in the document as well?
> >
> > We have a few other follow-up notes:
> >
> > a)
> >
> >> OLD:
> >>  The measurement below indicates that, for link and local SRLG
> >>  protection, a 1-SID repair path delivers more than 99% coverage.  For
> >>  node protection, a 2-SID repair path yields 99% coverage.
> >> […]
> >>  The measurements listed in the tables indicate that for link and
> >>  local SRLG protection, a 1-SID repair path is sufficient to protect
> >>  more than 99% of the prefix in almost all cases.  For node
> >>  protection, 2-SID repair paths yield 99% coverage.
> >>  This seems like a duplicate. I would suggest removing the second
> paragraph.
> >> NEW:
> >>  The measurement below indicates that, for link and local SRLG
> >>  protection, a 1-SID repair path delivers more than 99% coverage.  For
> >>  node protection, a 2-SID repair path yields 99% coverage.
> >> In addition, text is not strictly correct. It’s not “a 1-SID repair
> path” but “a 1-SID or less repair path. Idem for “2-SID.
> >> Hence NEW2:     The measurement below indicates that, for link and
> local SRLG
> >>  protection, a 1-SID or less repair path delivers more than 99%
> coverage.  For
> >>  node protection, a 2-SID or less repair path yields 99% coverage.
> >> Feel free to reword in a better way.
> >
> > We have updated Appendix B as follows. Please review and let us know if
> this update captures your intended meaning:
> >
> > OLD:
> > The measurement below indicates that, for link and local SRLG
> protection, a 1-SID repair path delivers more than 99% coverage. For node
> protection, a 2-SID repair path yields 99% coverage.
> >
> > NEW:
> > The measurement below indicates that, for link and local SRLG
> protection, a repair path of 1 SID or less delivers more than 99%
> coverage.  For node protection, a repair path of 2 SIDs or less yields 99%
> coverage.
> >
> >
> > b)
> >
> >> ---
> >> §5.4
> >> OLD:  As mentioned in Section 3, a list of adjacency SIDs can be used
> to encode the path between P and Q. However, the PLR can perform additional
> computations to compute a list of segments that represent a loop-free path
> from P to Q.
> >> Problem: “a list of adjacency SIDs” _is_ (already) “a list of segments”.
> >> Proposed NEW: As mentioned in Section 3, a list of adjacency SIDs can
> be used to encode the path between P and Q. However, the PLR can perform
> additional computations to compute a shorter list of segments that
> represent a loop-free path from P to Q.
> >> (+ ‘shorter’)
> >> Alternatively, we could introduce the term “node SIDs’ to explicit the
> difference compared to the list of adjacency SIDs, but this may be harder
> to phrase and less general.
> >> e.g, Proposed NEW2: As mentioned in Section 3, a list of adjacency SIDs
> can be used to encode the path between P and Q. However, the PLR can
> perform additional computations to compute a list of node and adjacency
> segments that represent a loop-free path from P to Q.
> >> ---
> >
> > We have updated the document to use the first “Proposed NEW” as seen
> above.
> >
> >
> > We will await responses to our other remaining questions prior to moving
> this document forward in the publication process.
> >
> > Please review the document carefully to ensure satisfaction as we do not
> make changes once it has been published as an RFC.
> >
> > — FILES (please refresh): —
> >
> > The updated files have been posted here:
> > https://www.rfc-editor.org/authors/rfc9855.txt
> > https://www.rfc-editor.org/authors/rfc9855.pdf
> > https://www.rfc-editor.org/authors/rfc9855.html
> > https://www.rfc-editor.org/authors/rfc9855.xml
> >
> > The relevant diff files have been posted here:
> > https://www.rfc-editor.org/authors/rfc9855-auth48diff.html (AUTH48
> changes only)
> > https://www.rfc-editor.org/authors/rfc9855-auth48rfcdiff.html (AUTH 48
> changes side by side)
> > https://www.rfc-editor.org/authors/rfc9855-diff.html (all changes)
> > https://www.rfc-editor.org/authors/rfc9855-rfcdiff.html (all changes
> side by side)
> >
> > The AUTH48 status page for this document is available here:
> > https://www.rfc-editor.org/auth48/rfc9855
> >
> > Thank you,
> >
> > Kaelin Foody
> > RFC Production Center
> >
> >
> >> On Sep 8, 2025, at 8:06 AM, [email protected] wrote:
> >>
> >> All,
> >> The email address used for Daniel Voyer is outdated.
> >> Adding  [email protected] to this thread as per
> https://datatracker.ietf.org/person/[email protected]
> >>    From: DECRAENE Bruno INNOV/NET
> >> Sent: Monday, September 8, 2025 1:55 PM
> >> To: [email protected]
> >> Cc: [email protected]; [email protected];
> >> [email protected]; [email protected];
> >> [email protected]; [email protected];
> >> [email protected]; [email protected]; [email protected];
> >> [email protected]
> >> Subject: RE: AUTH48: RFC-to-be 9855
> >> <draft-ietf-rtgwg-segment-routing-ti-lfa-21> for your review  Hi RFC
> >> Editor, all  Thanks for the document.
> >> Please find below some comments.
> >> Some comments are beyond editorial (§7.1, §5.4). Someone please review
> and ack.
> >> §5
> >> In figure 1, the link/line from R2 to N1 is significantly offset from
> >> N1. It looks doable to better align the link & N1
> >> OLD:
> >>  S ------- N1 ----------- D
> >>  *\         |  \          |
> >>  * \        |   \         |
> >>  *  \       |    \        |
> >>  *   N2-----R1****R2 *** R3
> >>  *          *
> >>  N3 *********
> >> NEW:
> >>  S --------- N1 --------- D
> >>  *\          | \          |
> >>  * \         |  \         |
> >>  *  \        |   \        |
> >>  *   N2----- R1***R2 *** R3
> >>  *           *
> >>  N3 **********
> >>  ----
> >> §5.4
> >> OLD: post- convergence
> >> NEW: post-convergence
> >> ---
> >> §5.4
> >> OLD:  As mentioned in Section 3, a list of adjacency SIDs can be used
> to encode the path between P and Q. However, the PLR can perform additional
> computations to compute a list of segments that represent a loop-free path
> from P to Q.
> >> Problem: “a list of adjacency SIDs” _is_ (already) “a list of segments”.
> >> Proposed NEW: As mentioned in Section 3, a list of adjacency SIDs can
> be used to encode the path between P and Q. However, the PLR can perform
> additional computations to compute a shorter list of segments that
> represent a loop-free path from P to Q.
> >> (+ ‘shorter’)
> >> Alternatively, we could introduce the term “node SIDs’ to explicit the
> difference compared to the list of adjacency SIDs, but this may be harder
> to phrase and less general.
> >> e.g, Proposed NEW2: As mentioned in Section 3, a list of adjacency SIDs
> can be used to encode the path between P and Q. However, the PLR can
> perform additional computations to compute a list of node and adjacency
> segments that represent a loop-free path from P to Q.
> >> ---
> >> §7.1
> >> OLD: If the active segment is a node segment that has been signaled
> with penultimate hop popping, and the repair list ends with an adjacency
> segment terminating on a node that advertised the "NEXT" operation
> [RFC8402] of the active segment, then the active segment MUST be popped
> before pushing the repair list.
> >> Problem: the penultimate does not really “advertise’ the NEXT
> >> operation. (penultimate of popping is advertised by the ultimate node)
> Proposed NEW: If the active segment is a node segment that has been
> signaled with penultimate hop popping, and the repair list ends with an
> adjacency segment terminating on the penultimate node of the active
> segment, then the active segment MUST be popped before pushing the repair
> list.
> >> ---
> >> Appendix A
> >>  OLD:
> >>               H --- I --- J
> >>              |           | \
> >>   PE4        |           |  PE3
> >>      \       | (L)       | /
> >>        A --- X --- B --- G
> >>       /      |           | \
> >>    PE1       |           |  PE2
> >>       \      |           | /
> >>        C --- D --- E --- F
> >>   NEW:
> >>               H --- I --- J *
> >>              |           |  *
> >>   PE4        |           |   PE3
> >>      \       | (L)       |  *
> >>      * A --- X --- B --- G *
> >>     *        |           |  *
> >>   PE1        |           |   PE2
> >>     *        |           |  *
> >>      * C --- D --- E --- F *
> >>  Note:
> >> -       “In  Figure 3, we consider a network with all metrics equal to
> 1 except the metrics on links used by PE1, PE2, and PE3, which are 1000.”
> >> -       In all other Figures (1 & 2), we used a convention to use “**”
> for the links having the high metric. I’d propose that we do the same
> convention for Figure 3.
> >> ---
> >> Appendix A
> >> “Another consideration to take into account is as follows: While using
> the expected post-convergence path”
> >> I’m not familiar with English typographic rules, but I would not have
> expected an upper case “W” for “While”
> >> --
> >> Appendix A
> >> OLD:
> >>   The measurement below indicates that, for link and local SRLG
> >>   protection, a 1-SID repair path delivers more than 99% coverage.  For
> >>   node protection, a 2-SID repair path yields 99% coverage.
> >> […]
> >>   The measurements listed in the tables indicate that for link and
> >>   local SRLG protection, a 1-SID repair path is sufficient to protect
> >>   more than 99% of the prefix in almost all cases.  For node
> >>   protection, 2-SID repair paths yield 99% coverage.
> >>   This seems like a duplicate. I would suggest removing the second
> paragraph.
> >>  NEW:
> >>   The measurement below indicates that, for link and local SRLG
> >>   protection, a 1-SID repair path delivers more than 99% coverage.  For
> >>   node protection, a 2-SID repair path yields 99% coverage.
> >>  In addition, text is not strictly correct. It’s not “a 1-SID repair
> path” but “a 1-SID or less repair path. Idem for “2-SID.
> >> Hence NEW2:
> >>    The measurement below indicates that, for link and local SRLG
> >>   protection, a 1-SID or less repair path delivers more than 99%
> coverage.  For
> >>   node protection, a 2-SID or less repair path yields 99% coverage.
> >> Feel free to reword in a better way.
> >> --
> >> Appendix A
> >> Nit picking… I would propose
> >> OLD: 100.0%
> >> NEW: 100%
> >> (in all tables)
> >> (as it’s mathematically not possible to go beyond 100%, the extra
> decimal digit is useless, while slightly reduce readability)
> >>  Thanks,
> >> Best regards,
> >> --Bruno
> >> -----Original Message-----
> >> From: [email protected] <[email protected]>
> >> Sent: Thursday, September 4, 2025 6:19 PM
> >> To: [email protected]; [email protected]; [email protected];
> >> [email protected]; DECRAENE Bruno INNOV/NET
> >> <[email protected]>; [email protected]
> >> Cc: [email protected]; [email protected];
> >> [email protected]; [email protected];
> >> [email protected]; [email protected]
> >> Subject: AUTH48: RFC-to-be 9855
> >> <draft-ietf-rtgwg-segment-routing-ti-lfa-21> for your review
> >>
> >> ----------------------------------------------------------------------
> >> ----------------------------------------
> >> CAUTION : This email originated outside the company. Do not click on
> any links or open attachments unless you are expecting them from the sender.
> >> ATTENTION : Cet e-mail provient de l'extérieur de l'entreprise. Ne
> cliquez pas sur les liens ou n'ouvrez pas les pièces jointes à moins de
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> >> --------------------------------------
> >> RFC9855 (draft-ietf-rtgwg-segment-routing-ti-lfa-21)
> >> Title            : Topology Independent Fast Reroute using Segment
> Routing
> >> Author(s)        : A. Bashandy, S. Litkowski, C. Filsfils, P. Francois,
> B. Decraene, D. Voyer
> >> WG Chair(s)      : Jeff Tantsura, Yingzhen Qu
> >> Area Director(s) : Jim Guichard, Ketan Talaulikar, Gunter Van de Velde
> >>
> >> ______________________________________________________________________
> >> ______________________________________
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