Hi Stephane, Pierre, all, 

Thank you for your replies and for confirming those updates are correct.

Please note that we await responses to our document-specific questions before 
moving this document forward in the publication process. You may find these 
questions at the end of this email.

The AUTH48 status page for this document is available here:
https://www.rfc-editor.org/auth48/rfc9855  

— 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)


Thank you for your time,

Kaelin Foody
RFC Production Center

------------------------------------

Authors,

While reviewing this document during AUTH48, please resolve (as necessary) the 
following questions, which are also in the source file.

1) <!-- [rfced] Please insert any keywords (beyond those that appear in
the title) for use on https://www.rfc-editor.org/search. -->


2) <!-- [rfced] FYI - We have made some adjustments to the abstract in order 
to clarify the expansions of some abbreviations. Please review and let
us know if any further updates are necessary.

Original:
This document presents Topology Independent Loop-free Alternate Fast
Reroute (TI-LFA), aimed at providing protection of node and adjacency
segments within the Segment Routing (SR) framework.  This Fast
Reroute (FRR) behavior builds on proven IP Fast Reroute concepts
being LFAs, remote LFAs (RLFA), and remote LFAs with directed
forwarding (DLFA).

Current:
This document presents Topology Independent Loop-Free Alternate (TI-
LFA) Fast Reroute (FRR), which is aimed at providing protection of
node and adjacency segments within the Segment Routing (SR)
framework.  This FRR behavior builds on proven IP FRR concepts being
LFAs, Remote LFAs (RLFAs), and remote LFAs with directed
forwarding (DLFAs).
-->


3) <!-- [rfced] We were unable to find the term "Directed Loop-Free Alternates
(DLFA)" mentioned in RFC 5714. Is there an alternative reference that could
be used here?

Original:
By utilizing Segment Routing (SR), TI-LFA eliminates the need to
establish Targeted Label Distribution Protocol sessions with remote
nodes for leveraging the benefits of Remote Loop-Free Alternates
(RLFA) [RFC7490][RFC7916] or Directed Loop-Free Alternates (DLFA)
[RFC5714].  

-->


4) <!--[rfced] To improve readability, may we update "makes the requirement
unnecessary" to "eliminates the need" in the sentence below?

Original:
Utilizing SR makes the requirement unnecessary to establish
additional state within the network for enforcing explicit Fast
Reroute (FRR) paths.

Perhaps:
Utilizing SR also eliminates the need to establish an
additional state within the network for enforcing explicit Fast
Reroute (FRR) paths.
-->   


5) <!-- [rfced] To improve readability, we have reformatted the text that
appears at the end of the Introduction into a bulleted list. Please review.

In addition, may we adjust these three items for consistency with the other
list items (so that each list item begins with the section number it refers
to)?

Note: The section numbers in this document have changed so they may
appear differently in the "Perhaps" text.


Original:
Using the properties defined in Section 5, Section 6 describes how to
compute protection lists that encode a loop-free post-convergence
path towards the destination.
...
Certain considerations are needed when adjacency segments are used in
a repare list.  Section 10 provides an overview of these
considerations.
...
By implementing the algorithms detailed in this document within
actual service provider and large enterprise network environments,
real-life measurements are presented regarding the number of SIDs
utilized by repair paths.  These measurements are summarized in
Appendix B.

Perhaps: 
*  Section 5 describes how to compute protection lists that encode a
   loop-free post-convergence path towards the destination using the
   properties defined in Section 4.
...
*  Section 9 provides an overview of the certain considerations that
   are needed when adjacency segments are used in a repair list.
...
*  Appendix B summarizes the measurements from implementing the
   algorithms detailed in this document within actual service
   provider and large enterprise network environments.  Real-life
   measurements are presented regarding the number of SIDs utilized
   by repair paths.
-->


6) <!-- [rfced] FYI - The main notations in the Terminology section  were
formatted inconsistently, so we have reformatted those items into a
bulleted list.

Please review the changes to the following items in particular:

Original:
Primary Interface: Primary Outgoing Interface: One of the outgoing
interfaces towards a destination according to the IGP link-state
protocol

Primary Link: A link connected to the primary interface

adj-sid(S-F): Adjacency Segment from node S to node F

Current:
*  The primary interface and the primary outgoing interface are one of
   the outgoing interfaces towards a destination according to the IGP
   link-state protocol.

*  The primary link is a link connected to the primary interface.

*  The adj-sid(S-F) is the adjacency segment from node S to node F.

-->


7) <!-- [rfced] To improve readability, may we break up this sentence into
two sentences? If yes, would "the path" be the correct subject for the second
sentence?

Original:
The repair list encodes the explicit, and possibly post-convergence, path to
the destination, which avoids the protected resource X and, at the same
time, is guaranteed to be loop-free irrespective of the state of FIBs along
the nodes belonging to the explicit path as long as the states of the FIBs
are programmed according to a link-state IGP.

Perhaps:
The repair list encodes the explicit (and possibly post-convergence) path to
the destination, which avoids the protected resource X. At the same time,
the path is guaranteed to be loop-free, irrespective of the state of FIBs
along the nodes belonging to the explicit path, as long as the states of the
FIBs are programmed according to a link-state IGP.

-->


8) <!-- [rfced] FYI - We have updated the "0" in "Adj-Sid(R20R3)" to "-".
Please review and let us know if further updates are needed.

Original:
As a result, the TI-LFA repair list of S for destination D
considering the failure of node N1 is: <Node-SID(R1), Adj-Sid(R1-R2),
Adj-Sid(R20R3)>

Current:
As a result, the TI-LFA repair list of S for destination D 
considering the failure of node N1 is: <Node-SID(R1), Adj-Sid(R1-R2),
Adj-Sid(R2-R3)>.
-->


9) <!--[rfced] May we update "non protected" to "unprotected" in the
sentence below?

Original:
To avoid the possibility of this double FRR activation, an
implementation of TI-LFA MAY pick only non protected adjacency
segments when building the repair list.

Perhaps:
To avoid the possibility of this double FRR activation, an
implementation of TI-LFA MAY pick only unprotected adjacency
segments when building the repair list.
-->   


10) <!-- [rfced] Terminology:

a) We note different formatting and spacing for the following items
throughout this document (some examples below). Please review and let
us know if/how these items should be made consistent.

spacing and apostrophe:
P'(R,X)
P'(R, X)
P(R,X)

spacing:
[adj-sid(S-F),node(T),...]
[adj-sid(S-F), node(T), ...]


b) We note different capitalization and hyphenation for the following terms
throughout this document (see some examples below). How should these be
updated for consistency?

Adjacency segment vs. adjacency segment
Adjacency SIDs vs. adjacency SIDs

Adj-SID vs. Adj-Sid vs. adj-SID vs. adj-sid
Node SID vs. Node-SID vs. node-SID

P-Space vs. P-space
Q-Space vs. Q-space 


c) May we update all instances of "dataplane" to "data plane" for consistency
with RFC 8660?  


d) FYI - For consistency with RFC 9350, we have updated the terms below as
follows:

OLD -> NEW

FlexAlgo / Flex Algo -> Flexible Algorithm
Flex Algo Definition -> Flexible Algorithm Definition
-->


11) <!-- [rfced] Abbreviations:

a) We note that "DLFA" has been expanded inconsistently throughout
the document. For consistency, may we update all of these expansions
to be "Directed Loop-Free Alternates"?

Original:
remote LFAs with directed forwarding (DLFA)
DLFA: Remote LFA with Directed forwarding
DLFA (LFA with directed forwarding)
Directed Loop-Free Alternates (DLFA)

Perhaps:
Directed Loop-Free Alternates (DLFA)


b) Per Section 3.6 of RFC 7322 ("RFC Style Guide"), abbreviations should be
expanded upon first use. How may we expand "rSPF" in the text below?

Original:
...in all the SPF/rSPF computations that are occurring
during the TI-LFA computation.


c) Both the expansion and the acronym for the following terms are used
throughout the document. Would you like to update to using the expansion
upon first usage and the acronym for the rest of the document for consistency?

Point of Local Repair (PLR)
Repair List (RL)
Segment Routing (SR)


d) FYI - We have added expansions for the following abbreviations
per Section 3.6 of RFC 7322 ("RFC Style Guide"). Please review each
expansion in the document carefully to ensure correctness.  

Segment Routing over MPLS (SR-MPLS)
Segment Routing over IPv6 (SRv6)
Provider Edge (PE) 
-->


12) <!-- [rfced] Please review the "Inclusive Language" portion of the online 
Style Guide <https://www.rfc-editor.org/styleguide/part2/#inclusive_language>
and let us know if any changes are needed.  Updates of this nature typically
result in more precise language, which is helpful for readers.

Note that our script did not flag any words in particular, but this should 
still be reviewed as a best practice. -->




> On Sep 25, 2025, at 4:59 AM, Stephane Litkowski (slitkows) 
> <[email protected]> wrote:
> 
> Hi Kaelin,
> On a) (below), I’m fine with the proposed text (NEW2) and you correctly 
> catched the duplicate.
>>> 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.
> 
> On b), your first proposal (NEW) is good and correctly fixes the issue:
>>> 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’)
>  I’m good with the rest of the updates.
> Thanks,
> Stephane
> From: Yingzhen Qu <[email protected]>
> Sent: Thursday, September 25, 2025 7:03 AM
> To: Kaelin Foody <[email protected]>
> Cc: [email protected]; [email protected]; [email protected]; 
> [email protected]; [email protected]; 
> [email protected]; [email protected]; 
> [email protected]; Stephane Litkowski (slitkows) <[email protected]>; 
> Clarence Filsfils (cfilsfil) <[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
> 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 
>>> perhttps://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 
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>>> RFC Editor
>>> --------------------------------------
>>> 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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