Hi all, Pierre - Thank you for your approval; we have marked it on the AUTH48 status page for this document.
We will await approvals from the remaining authors listed on the AUTH48 status page prior to moving forward in the publication process. The AUTH48 status page for this document is available here: https://www.rfc-editor.org/auth48/rfc9855 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 Diff files showing changes between the last and current version: https://www.rfc-editor.org/authors/rfc9855-lastdiff.html https://www.rfc-editor.org/authors/rfc9855-lastrfcdiff.html (side by side) Diff files showing all changes made during AUTH48: https://www.rfc-editor.org/authors/rfc9855-auth48diff.html https://www.rfc-editor.org/authors/rfc9855-auth48rfcdiff.html (side by side) Diff files showing all changes: https://www.rfc-editor.org/authors/rfc9855-diff.html https://www.rfc-editor.org/authors/rfc9855-rfcdiff.html (side by side) Thank you for your time, Kaelin Foody RFC Production Center > On Oct 7, 2025, at 5:01 PM, Kaelin Foody <[email protected]> wrote: > > Hi Jim, authors, > > Jim - Thank you for your approval; we have marked it on the AUTH48 status > page for this document. > > Authors - Please review our most recent updates in this email thread and > contact us with any further updates or with your approval of the document in > its current form. > > We will await approvals from each author listed on the AUTH48 status page > prior to moving forward in the publication process. The AUTH48 status page > for this document is available here: > https://www.rfc-editor.org/auth48/rfc9855 > > 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 > > Diff files showing changes between the last and current version: > https://www.rfc-editor.org/authors/rfc9855-lastdiff.html > https://www.rfc-editor.org/authors/rfc9855-lastrfcdiff.html (side by side) > > Diff files showing all changes made during AUTH48: > https://www.rfc-editor.org/authors/rfc9855-auth48diff.html > https://www.rfc-editor.org/authors/rfc9855-auth48rfcdiff.html (side by side) > > Diff files showing all changes: > https://www.rfc-editor.org/authors/rfc9855-diff.html > https://www.rfc-editor.org/authors/rfc9855-rfcdiff.html (side by side) > > Thank you for your time, > > Kaelin Foody > RFC Production Center > > >> On Oct 7, 2025, at 7:30 AM, James Guichard <[email protected]> >> wrote: >> >> These changes look reasonable. Approved. >> Jim >> From: Kaelin Foody <[email protected]> >> Date: Monday, October 6, 2025 at 5:51 PM >> To: Stephane Litkowski (slitkows) <[email protected]> >> Cc: Yingzhen Qu <[email protected]>, >> [email protected]<[email protected]>, >> [email protected] <[email protected]>, [email protected] >> <[email protected]>, [email protected] <[email protected]>, >> [email protected] <[email protected]>, James Guichard >> <[email protected]>, [email protected] >> <[email protected]>, [email protected] >> <[email protected]>, Clarence Filsfils (cfilsfil) >> <[email protected]>, [email protected] >> <[email protected]>, [email protected]<[email protected]>, >> danvoyerwork <[email protected]> >> Subject: Re: [AD] AUTH48: RFC-to-be 9855 >> <draft-ietf-rtgwg-segment-routing-ti-lfa-21> for your review >> Hi *Jim, Stephane, all, >> >> >> *Jim - As AD, please review the following changes summarized below. You may >> also view these changes in the diff: >> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.rfc-editor.org%2Fauthors%2Frfc9855-auth48diff.html&data=05%7C02%7Cjames.n.guichard%40futurewei.com%7C14dca863080a4c83674108de052276f2%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C638953842806820225%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=tzq60ONqJma%2F54wsRuoWuf%2FSz59AdKm%2BJh4VljvYdL0%3D&reserved=0. >> >> a) Section 5.4: Addition of “shorter” in the text below: >> >> OLD: >> >> However, the PLR can perform additional computations to compute a >> list of segments that represent a loop-free path from P to Q. >> >> NEW: >> >> However, the PLR can perform additional computations to compute a >> shorter list of segments that represent a loop-free path from P to Q. >> >> >> b) Section 7.1: Updates to “a node that advertised NEXT operation”: >> >> OLD: >> >> 1. 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 NEXT >> operation [RFC8402] of the active segment, then the active >> segment MUST be popped before pushing the repair list. >> >> NEW: >> >> 1. 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. >> >> >> c) Appendix B: Updates to “1 SID repair path” and “2 SIDs repair path”: >> >> OLD: >> >> The measurement below indicate that for link and local SRLG >> protection, a 1 SID repair path delivers more than 99% coverage. For >> node protection a 2 SIDs 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. >> >> >> >> Stephane - Thank you for your reply; we have updated the document >> accordingly. We have a few follow-up notes and questions: >> >>>> 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]. >>>> >>> >>> [SLI] DLFA is mentioned in " draft-bryant-ipfrr-tunnels-03" as directed >>> forwarding >> >> FYI - We have added draft-bryant-ipfrr-tunnels-03 as an entry in the >> Informative References section and updated this citation accordingly. >> >> >>>> 10) <!-- [rfced] Terminology: >>>> >>>> spacing: >>>> [adj-sid(S-F),node(T),...] >>>> [adj-sid(S-F), node(T), ...] >>>> >>> [SLI] Spacing can be made consistent >>>> >>>> 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 >>>> >>> >>> [SLI] I would use Adjacency segment. (as expansion of Adj-SID) >>> >>>> Adj-SID vs. Adj-Sid vs. adj-SID vs. adj-sid Node SID vs. Node-SID vs. >>>> node-SID >>> >>> [SLI] Need to use Adj-SID (or Adj-SIDs) in conformance to RFC8402, >>> "Node-SID" must also be used. >> >> We have made the capitalization and spacing consistent for the items above >> but have some follow-up questions: >> >> a) Please let us know if “adj-sid” should also be updated to “Adj-SID” when >> it appears in the bracketed segment lists (e.g., [adj-sid(S-F), node(T), >> …]), which appear in Sections 6.2.1, 6.2.2, and 9. >> >> b) We note the use of both “Adjacency SID” and “Adj-SID” used outside of >> notations. Are these the same term, and should either of them be updated for >> consistency? Kindly review and let us know your preference. >> >> >> Upon careful review, please contact us with any further updates or with your >> approval of the document in its current form. We will await approvals from >> each author listed on the AUTH48 status page prior to moving forward in the >> publication process. >> >> The AUTH48 status page for this document is available here: >> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.rfc-editor.org%2Fauth48%2Frfc9855&data=05%7C02%7Cjames.n.guichard%40futurewei.com%7C14dca863080a4c83674108de052276f2%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C638953842806864154%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=cqPvMKqtDe6XdbdgGhFx%2FRhyrlOHt6dysQpJBr%2BzgzU%3D&reserved=0 >> >> >> 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: >> >> 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https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.rfc-editor.org%2Fauthors%2Frfc9855-lastdiff.html&data=05%7C02%7Cjames.n.guichard%40futurewei.com%7C14dca863080a4c83674108de052276f2%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C638953842806954506%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=ORm0XSZ33It%2BQ0dEcFYSmcLYN0%2BmFbUgJP%2BWmnlTCsU%3D&reserved=0 >> >> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.rfc-editor.org%2Fauthors%2Frfc9855-lastrfcdiff.html&data=05%7C02%7Cjames.n.guichard%40futurewei.com%7C14dca863080a4c83674108de052276f2%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C638953842806973115%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=Uz2hdMzCRmsVKc00j7%2FHp5wt%2B3LJjfraJMUfCxPTuoM%3D&reserved=0 >> (side by side) >> >> Diff files showing all changes made during AUTH48: >> >> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.rfc-editor.org%2Fauthors%2Frfc9855-auth48diff.html&data=05%7C02%7Cjames.n.guichard%40futurewei.com%7C14dca863080a4c83674108de052276f2%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C638953842806990905%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=%2B323jFgRpeWhgDmQ0hXaBDMeaeNg699glKo0JyOewF4%3D&reserved=0 >> >> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.rfc-editor.org%2Fauthors%2Frfc9855-auth48rfcdiff.html&data=05%7C02%7Cjames.n.guichard%40futurewei.com%7C14dca863080a4c83674108de052276f2%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C638953842807007587%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=wnOi2XsNl8shSTz%2BqjQgU%2BOAke%2BGWkMc6HjtmwyOkRM%3D&reserved=0 >> (side by side) >> >> Diff files showing all changes: >> >> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.rfc-editor.org%2Fauthors%2Frfc9855-diff.html&data=05%7C02%7Cjames.n.guichard%40futurewei.com%7C14dca863080a4c83674108de052276f2%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C638953842807025344%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=JJDlSAVoy9%2F8Q0m9xU8pJ6BoVFnlLOQjm8ZWyxCuwes%3D&reserved=0 >> >> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.rfc-editor.org%2Fauthors%2Frfc9855-rfcdiff.html&data=05%7C02%7Cjames.n.guichard%40futurewei.com%7C14dca863080a4c83674108de052276f2%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C638953842807043099%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=Z20hAxy77HENUEkgDaH9RzGdlHIhdyfG0zwqlbZvO3o%3D&reserved=0(side >> by side) >> >> Thank you for your time, >> >> Kaelin Foody >> RFC Production Center >> >>> On Oct 3, 2025, at 5:39 AM, Stephane Litkowski (slitkows) >>> <[email protected]> wrote: >>> >>> Hi Kaelin, >>> >>> Thanks, please find answers below >>> >>> Brgds, >>> >>> Stephane >>> >>> >>> -----Original Message----- >>> From: Kaelin Foody <[email protected]> >>> Sent: Thursday, October 2, 2025 6:55 PM >>> To: Stephane Litkowski (slitkows) <[email protected]> >>> Cc: Yingzhen Qu <[email protected]>; [email protected]; >>> [email protected]; [email protected]; [email protected]; >>> [email protected]; [email protected]; >>> [email protected]; [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 >>> >>> Greetings, >>> >>> This is just a friendly reminder that we await your responses to our >>> document-specific questions; you can find these included in this email >>> thread. Please review and let us know if we can be of any assistance as you >>> review. >>> >>> You may find the AUTH48 status page for this document here: >>> https://nam11.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.rfc-editor.org%2Fauth48%2Frfc9855&data=05%7C02%7Cjames.n.guichard%40futurewei.com%7C14dca863080a4c83674108de052276f2%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C638953842807060797%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=5u7tcguDJ%2B5PosOXZ87svmfOYVu7Wh287fel0y06aBk%3D&reserved=0 >>> >>> The AUTH48 FAQs are available at >>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.rfc-editor.org%2Ffaq%2F%23auth48&data=05%7C02%7Cjames.n.guichard%40futurewei.com%7C14dca863080a4c83674108de052276f2%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C638953842807078391%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=5NaSIAyBZuXzqjFCVvOMYh7ya2gLVcIQHSnaBc%2Fpiuw%3D&reserved=0. >>> >>> We look forward to hearing from you at your earliest convenience. >>> >>> Thank you, >>> >>> Kaelin Foody >>> RFC Production Center >>> >>>> On Sep 26, 2025, at 12:16 PM, Kaelin Foody <[email protected]> >>>> wrote: >>>> >>>> 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://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.rfc-editor.org%2Fauth48%2Frfc9855&data=05%7C02%7Cjames.n.guichard%40futurewei.com%7C14dca863080a4c83674108de052276f2%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C638953842807095995%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=cQRUBk0UekAwbF0I6tXiN7I7vaFWq3Tr%2ByK6eNiLCM0%3D&reserved=0 >>>> >>>> — FILES (please refresh): — >>>> >>>> The updated files have been posted here: >>>> 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>>>> 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://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.rfc-editor.org%2Fsearch&data=05%7C02%7Cjames.n.guichard%40futurewei.com%7C14dca863080a4c83674108de052276f2%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C638953842807393579%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=Xt5oAmUdISFXFMokxVwyRvaIeIlKi2NeoSSEbcHn0Zk%3D&reserved=0. >>>> --> >>>> >>> >>> [SLI] I would propose: TILFA, LFA, FRR, fast reroute, recovery, SR, >>> protection, convergence >>>> >>>> 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). >>>> --> >>>> >>> >>> >>> [SLI] I'm good with the proposal >>> >>>> >>>> 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]. >>>> >>> >>> [SLI] DLFA is mentioned in " draft-bryant-ipfrr-tunnels-03" as directed >>> forwarding >>> >>>> --> >>>> >>>> >>>> 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. >>>> --> >>>> >>> >>> [SLI] I'm good with the proposal >>> >>>> >>>> 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. >>>> --> >>>> >>> >>> [SLI] That looks ok to me >>> >>> >>>> >>>> 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. >>>> >>>> --> >>>> >>> >>> [SLI] Fine >>> >>>> >>>> 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. >>>> >>>> --> >>>> >>> >>> [SLI] Ok to split, the subject must be "the repair list" or "the path >>> provided by the repair list" >>> >>>> >>>> 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)>. >>>> --> >>>> >>> >>> [SLI] good catch >>> >>>> >>>> 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. >>>> --> >>>> >>> >>> [SLI] makes sense >>> >>>> >>>> 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) >>> >>> [SLI] Spacing can be made consistent, however P and P' usage is on purpose. >>> P() represents the P-Space, P'() represents the extended P-Space >>>> >>>> spacing: >>>> [adj-sid(S-F),node(T),...] >>>> [adj-sid(S-F), node(T), ...] >>>> >>> >>> [SLI] Spacing can be made consistent >>>> >>>> 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 >>>> >>> >>> [SLI] I would use Adjacency segment. (as expansion of Adj-SID) >>> >>>> Adj-SID vs. Adj-Sid vs. adj-SID vs. adj-sid Node SID vs. Node-SID vs. >>>> node-SID >>> >>> [SLI] Need to use Adj-SID (or Adj-SIDs) in conformance to RFC8402, >>> "Node-SID" must also be used. >>> >>>> >>>> P-Space vs. P-space >>>> Q-Space vs. Q-space >>>> >>> >>> [SLI] I would use P-space, Q-space in conformance to RFC7490 >>> >>>> >>>> c) May we update all instances of "dataplane" to "data plane" for >>>> consistency with RFC 8660? >>>> >>> >>> [SLI] fine >>> >>>> >>>> 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 >>>> --> >>>> >>> >>> [SLI] OK >>> >>>> >>>> 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) >>>> >>> >>> [SLI] OK >>> >>>> >>>> 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. >>>> >>> [SLI] reverse SPF >>> >>>> >>>> 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) >>>> >>> >>> [SLI] Yes makes sense >>> >>>> >>>> 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) >>>> --> >>>> >>> >>> [SLI] the doc looks OK >>> >>>> >>>> 12) <!-- [rfced] Please review the "Inclusive Language" portion of the >>>> online Style Guide >>>> <https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.rfc-editor.org%2Fstyleguide%2Fpart2%2F%23inclusive_language&data=05%7C02%7Cjames.n.guichard%40futurewei.com%7C14dca863080a4c83674108de052276f2%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C638953842807417340%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=vTaFmv%2FLV1LHFLREVsuBsYaBrx51I5AaYITVn0%2Ft7ic%3D&reserved=0> >>>> 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://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.rfc-editor.org%2Fauthors%2Frfc9855.txt&data=05%7C02%7Cjames.n.guichard%40futurewei.com%7C14dca863080a4c83674108de052276f2%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C638953842807513753%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=8VEK4sG%2F5osRVMFuPm1BwqK8eCX2I%2FwJByV4VALJjjA%3D&reserved=0 >>>>> 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https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.rfc-editor.org%2Fauth48%2Frfc9855&data=05%7C02%7Cjames.n.guichard%40futurewei.com%7C14dca863080a4c83674108de052276f2%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C638953842807830725%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=K0nsXdKJjSNIlzj6LrBK8AU0snkTV10Ebl5Vvr09uVs%3D&reserved=0 >>>>> >>>>> 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: >>>>>> 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48 changes side by side) >>>>>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.rfc-editor.org%2Fauthors%2Frfc9855-diff.html&data=05%7C02%7Cjames.n.guichard%40futurewei.com%7C14dca863080a4c83674108de052276f2%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C638953842807969119%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=HrNNQKVPdrPQ9mAUHrJIKcEgVzKv3WP7Y19UkhHZyTY%3D&reserved=0 >>>>>> (all changes) >>>>>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.rfc-editor.org%2Fauthors%2Frfc9855-rfcdiff.html&data=05%7C02%7Cjames.n.guichard%40futurewei.com%7C14dca863080a4c83674108de052276f2%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C638953842807986954%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=i4I%2F2KfX91%2B56DUuaWsuSfJ5QcMOm0d%2BdHp8XMupqxE%3D&reserved=0 >>>>>> (all changes >>>>>> side by side) >>>>>> >>>>>> The AUTH48 status page for this document is available here: >>>>>> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.rfc-editor.org%2Fauth48%2Frfc9855&data=05%7C02%7Cjames.n.guichard%40futurewei.com%7C14dca863080a4c83674108de052276f2%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C638953842808005926%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=K0s4kzQ5%2B4pnIwOb8hVqskInc3StwQzVuFLoynodln8%3D&reserved=0 >>>>>> >>>>>> 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://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdatatracker.ietf.org%2Fperson%2Fdanvoyerwork%40gmail.com&data=05%7C02%7Cjames.n.guichard%40futurewei.com%7C14dca863080a4c83674108de052276f2%7C0fee8ff2a3b240189c753a1d5591fedc%7C1%7C1%7C638953842808135083%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=LAsYhNEgag4zlAIYime1goJ9TJ0hMDYwXcw465%2FmVAo%3D&reserved=0 >>>>>>> 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. 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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 >>>>>>> >>>>>>> ___________________________________________________________________ >>>>>>> ___ ______________________________________ >>>>>>> Ce message et ses pieces jointes peuvent contenir des informations >>>>>>> confidentielles ou privilegiees et ne doivent donc pas etre >>>>>>> diffuses, exploites ou copies sans autorisation. Si vous avez recu >>>>>>> ce message par erreur, veuillez le signaler a l'expediteur et le >>>>>>> detruire ainsi que les pieces jointes. Les messages electroniques etant >>>>>>> susceptibles d'alteration, Orange decline toute responsabilite si ce >>>>>>> message a ete altere, deforme ou falsifie. 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