Hi Rebecca I reviewed the documents and am good with all the updates.
Kind Regards Gyan On Wed, May 14, 2025 at 12:48 AM Rebecca VanRheenen < rvanrhee...@staff.rfc-editor.org> wrote: > Hello authors, > > This is a friendly reminder that we await answers to the questions below > and your review of the document before continuing with the publication > process. > > Please let us know if we can be of assistance as you complete your review. > We look forward to hearing from you. > > Thank you, > RFC Editor/rv > > > > On May 5, 2025, at 3:06 PM, rfc-edi...@rfc-editor.org wrote: > > > > Authors, > > > > While reviewing this document during AUTH48, please resolve (as > necessary) the following questions, which are also in the XML file. > > > > > > 1) <!-- [rfced] We made the following changes to the document title: 1) > updated > > "Multi-Point" to "Multipoint" and 2) updated "Label Switched Path (LSP)" > > to "Label Switched Paths (LSPs)" (plural). Let us know any concerns. > > > > Original: > > Bidirectional Forwarding Detection (BFD) for Multipoint Networks over > > Point-to-Multi-Point MPLS Label Switched Path (LSP) > > > > Current: > > Bidirectional Forwarding Detection (BFD) for Multipoint Networks over > > Point-to-Multipoint MPLS Label Switched Paths (LSPs) > > --> > > > > > > 2) <!-- [rfced] Please review the following sentences in the abstract and > > introduction to ensure that they align with the document title and the > > rest of the document. These similar sentences mention SR P2MP policies > > with an SR-MPLS data plane, which are not mentioned in the document > > title. In addition, we only see SR and SR-MPLS mentioned in one sentence > > in Section 4.1 (and in the Terminology section). Are any updates needed? > > > > Document Title: > > Bidirectional Forwarding Detection (BFD) for Multipoint Networks over > > Point-to-Multipoint MPLS Label Switched Paths (LSPs) > > > > Abstract: > > This document describes procedures for using Bidirectional Forwarding > > Detection (BFD) for multipoint networks to detect data plane failures > > in MPLS point-to-multipoint Label Switched Paths (LSPs) and Segment > > Routing (SR) point-to-multipoint policies with an SR over MPLS (SR- > > MPLS) data plane. > > > > Introduction: > > This document describes procedures for using such modes of the BFD > > protocol to detect data plane failures in Multiprotocol Label > > Switching (MPLS) point-to-multipoint (p2mp) Label Switched Paths > > (LSPs) and Segment Routing (SR) point-to-multipoint policies with an > > SR over MPLS (SR-MPLS) data plane. > > --> > > > > > > 3) <!-- [rfced] FYI - We updated "and recommends...and discourages" to > "by > > recommending...and discouraging" (we also made similar change in the > > introduction). Please review and let us know any concerns. > > > > Original: > > Furthermore, this document also updates RFC 8562 and recommends the > > use of an IPv6 address from the Dummy IPv6 range TBA2/64 > > (Section 7.1) and discourages the use of an IPv4 loopback address > > mapped to IPv6. > > > > Updated: > > Furthermore, this document updates RFC 8562 by recommending the > > use of an IPv6 address from the Dummy IPv6 Prefix range 100:0:0:1::/64 > > and discouraging the use of an IPv4 loopback address > > mapped to IPv6. > > --> > > > > > > 4) <!-- [rfced] How may we update this sentence to improve readability? > > > > Original: > > It also describes the applicability of LSP Ping, as in-band, and the > > control plane, as out-band, solutions to bootstrap a BFD session. > > > > Perhaps: > > This document also describes the applicability of LSP Ping (as an > in-band > > solution) and the control plane (as an out-of-band solution) to > bootstrap > > a BFD session. > > --> > > > > > > 5) <!-- [rfced] Please review the following sentences. The first > sentence (from > > the abstract) mentions both in-band and out-of-band solutions, but the > > sentence (from the introduction) only mentions out-of-band > > solutions. Should these be aligned? > > > > Original: > > It also describes the applicability of LSP Ping, as in-band, and the > > control plane, as out-band, solutions to bootstrap a BFD session. > > ... > > The document also describes the applicability of out-band solutions > > to bootstrap a BFD session in this environment. > > --> > > > > > > 6) <!-- [rfced] Please review "to select destination IPv6 addresses for" > > here. Would updating as follows make this text more clear? > > > > Original: > > Hence, IANA is requested > > to allocate TBA2/64 as a new Dummy IPv6 Prefix (Section 7.1) to > > select destination IPv6 addresses for IP/UDP encapsulation of > > management, control, and OAM packets. > > > > Perhaps: > > Hence, IANA has > > allocated 100:0:0:1::/64 as a new Dummy IPv6 Prefix (Section 7.1) for > > destination IPv6 addresses used for IP/UDP encapsulation of > > management, control, and Operations, Administration, and Maintenance > > (OAM) packets. > > --> > > > > > > 7) <!-- [rfced] We see both of the following in Section 1: > > > > address::ffff:127.0.0.1/128 > > ::ffff:127.0.0.1/128 > > > > Should "address::ffff:127.0.0.1/128" be updated as follows? > > > > Current: > > Historically, an IPv6-mapped IPv4 loopback range > > address::ffff:127.0.0.1/128 was mandated, although functionally, an > > IPv6 address from that range is not analogous to its IPv4 > > counterpart. > > > > Perhaps: > > Historically, an address in the IPv6-mapped IPv4 loopback range > > ::ffff:127.0.0.1/128 was mandated, although functionally, an > > IPv6 address from that range is not analogous to its IPv4 > > counterpart. > > --> > > > > > > 8) <!-- [rfced] To improve readability, we split this long sentence into > two > > sentences. Would it be helpful to further update to use > > "::ffff:127.0.0.1/128 range" instead of "IPv6-mapped IPv4 loopback range > > address" in the second sentence? > > > > Original: > > Thus, this > > document also updates [RFC8562] and recommends the use of an IPv6 > > address from the Dummy IPv6 Prefix range TBA2/64 (Section 7.1) while > > acknowledging that an address from ::ffff:127.0.0.1/128 range might > > be used by existing implementations, discourages the use of the > > IPv6-mapped IPv4 loopback range address. > > > > Current: > > Thus, this > > document updates [RFC8562] by recommending the use of an IPv6 address > > from the Dummy IPv6 Prefix range 100:0:0:1::/64 (Section 7.1) while > > acknowledging that an address from the ::ffff:127.0.0.1/128 range > > might be used by existing implementations. This document discourages > > the use of an address in the IPv6-mapped IPv4 loopback range. > > > > Perhaps: > > Thus, this > > document updates [RFC8562] by recommending the use of an IPv6 address > > from the Dummy IPv6 Prefix range 100:0:0:1::/64 (Section 7.1) while > > acknowledging that an address from the ::ffff:127.0.0.1/128 range > > might be used by existing implementations. This document discourages > > the use of an address from the ::ffff:127.0.0.1/128 range. > > --> > > > > > > 9) <!-- [rfced] We do not see "demultiplex" in Section 3.1. Please > review and let > > us know if any updates are needed. > > > > Original: > > If the BFD Control packet is encapsulated in IP/UDP, then > > the source IP address MUST be used to demultiplex the received BFD > > Control packet as described in Section 3.1. > > --> > > > > > > 10) <!-- [rfced] Should the introductory text include the first part of > the > > indented text here? > > > > Original: > > Thus, this > > specification further clarifies that: > > > > if multiple alternative paths for the given p2mp LSP Forwarding > > Equivalence Class (FEC) exist, the MultipointHead SHOULD use the > > Entropy Label [RFC6790] used for LSP Ping [RFC8029] to exercise > > those particular alternative paths; > > > > or the MultipointHead MAY use the UDP port number to possibly > > exercise those particular alternate paths. > > > > Perhaps: > > This > > specification further clarifies the following if multiple alternative > paths > > for the given P2MP LSP Forwarding Equivalence Class (FEC) exist: > > > > * The MultipointHead SHOULD use the Entropy Label [RFC6790] used for > LSP > > Ping [RFC8029] to exercise those particular alternative paths; or > > > > * The MultipointHead MAY use the UDP port number to possibly exercise > those > > particular alternate paths. > > --> > > > > > > 11) <!-- [rfced] The following sentences appear twice in Section 3.2 (as > the > > second paragraph and in the third paragraph). Which should be removed? > > > > Original: > > If a BFD Control packet in PW-ACH encapsulation (without IP/UDP > > Headers) is to be used in ACH, an implementation would not be able to > > verify the identity of the MultipointHead and, as a result, will not > > properly demultiplex BFD packets. Hence, a new channel type value is > > needed. > > --> > > > > > > 12) <!-- [rfced] Would it be helpful to clarify "the top three > four-octet words" > > here? Will readers understand what is defined in RFC 5586? > > > > Original: > > * the top three four-octet words as defined in [RFC5586]; > > --> > > > > > > 13) <!-- [rfced] We do not see mention of "BFD Control Message" in > [RFC5880]. > > Please review. > > > > Original: > > * the BFD Control Message field is as defined in [RFC5880]; > > --> > > > > > > 14) <!-- [rfced] Should the two instances of "Target FEC TLV" here be > "Target FEC > > Stack TLV"? We see "Target FEC Stack TLV" in RFC 6425. > > > > Original: > > LSP Ping, as defined in [RFC6425], MAY be used to bootstrap > > MultipointTail. If LSP Ping is used, it MUST include the Target FEC > > TLV and the BFD Discriminator TLV defined in [RFC5884]. For the case > > of p2mp MPLS LSP, the Target FEC TLV MUST use sub-TLVs defined in > > Section 3.1 [RFC6425]. > > --> > > > > > > 15) <!-- [rfced] May we update the introductory text to use "MUST" and > remove > > "MUST" from each bullet? Or do you prefer the current? > > > > Original: > > A MultipointTail that receives an LSP Ping that includes the BFD > > Discriminator TLV: > > > > * MUST validate the LSP Ping; > > > > * MUST associate the received BFD Discriminator value with the p2mp > > LSP; > > > > * MUST create a p2mp BFD session and set bfd.SessionType = > > MultipointTail as described in [RFC8562]; > > > > * MUST use the source IP address of LSP Ping, the value of BFD > > Discriminator from the BFD Discriminator TLV, and the identity of > > the p2mp LSP to properly demultiplex BFD sessions. > > > > Perhaps: > > A MultipointTail that receives an LSP Ping that includes the BFD > > Discriminator TLV MUST do the following: > > > > * validate the LSP Ping; > > > > * associate the received BFD Discriminator value with the P2MP > > LSP; > > > > * create a P2MP BFD session and set bfd.SessionType = > > MultipointTail as described in [RFC8562]; and > > > > * use the source IP address of the LSP Ping, the value of BFD > > Discriminator from the BFD Discriminator TLV, and the identity of > > the P2MP LSP to properly demultiplex BFD sessions. > > --> > > > > > > 16) <!-- [rfced] The second bulleted list in Section 5 is prefaced with > the > > following text. However, it looks like only the first four bullets detail > > settings. Should the last two bullets be regular paragraphs rather than > > part of the list? Or should this introductory text be updated? > > > > Original: > > Upon detecting the failure of the p2mp MPLS LSP, an egress LSR sends > > BFD Control packet with the following settings: > > --> > > > > > > 17) <!-- [rfced] What does "it" refer to here? > > > > Original: > > * these BFD Control packets are transmitted at the rate of one per > > second until either it receives a control packet valid for this > > BFD session with the Final (F) bit set from the ingress LSR or the > > defect condition clears. > > > > Perhaps: > > * These BFD Control packets are transmitted at the rate of one per > > second until either 1) the egress LSA receives a control packet > from the ingress LSR > > that is valid for this BFD session and has the Final (F) bit set or > 2) the > > defect condition clears. > > --> > > > > > > 18) <!-- [rfced] Please clarify "defined above" here. Is the intent "as > defined > > above" (with "as"), "with the settings described above", or something > > else? > > > > Original: > > However, to improve the likelihood of > > notifying the ingress LSR of the failure of the p2mp MPLS LSP, the > > egress LSR SHOULD initially transmit three BFD Control packets > > defined above in short succession. > > > > Perhaps: > > However, to improve the likelihood of > > notifying the ingress LSR of the failure of the p2mp MPLS LSP, the > > egress LSR SHOULD initially transmit three BFD Control packets > > (as defined above) in short succession. > > --> > > > > > > 19) <!-- [rfced] FYI - We updated Table 2 to <dl> as the table was too > wide for > > the txt output. Note that <dl> was used in other RFCs that have made > > allocations in the "IANA IPv6 Special-Purpose Address Registry" (e.g., > > RFCs 9637, 9602, and 9374). > > --> > > > > > > 20) <!-- [rfced] An informative reference is listed for the "IANA IPv6 > Special > > Purpose Address Registry" in Section 7.1. Would you like to also add an > > informative reference for the "MPLS Generalized Associated Channel > > (G-ACh) Types" registry in Section 7.2? > > --> > > > > > > 21) <!-- [rfced] Terminology > > > > a) We see the following forms used in this document. Should "P2MP" or > "MPLS" > > come first in this phrase? > > > > p2mp MPLS LSP > > MPLS p2mp LSP > > Point-to-Multipoint MPLS Label Switched Path (LSP) > > MPLS point-to-multipoint Label Switched Paths (LSPs) > > > > > > b) Please review the instances of "echo" in the document and let us know > if > > they should be capitalized or lowercased. > > > > MPLS echo reply > > MPLS echo request > > LSP Ping Echo request message > > > > > > c) We have updated "out-band" to "out-of-band" (two instances). Let us > know any > > objections. > > > > > > d) Would either of the following read more clearly? Or is the current > okay? > > > > Current: > > the Dummy IPv6 Prefix range 100:0:0:1::/64 > > > > Perhaps ("address block" instead of "range"): > > the Dummy IPv6 Prefix address block 100:0:0:1::/64 > > > > Or ("address block" and parentheses): > > the Dummy IPv6 Prefix address block (100:0:0:1::/64) > > --> > > > > > > 22) <!-- [rfced] Abbreviations > > > > a) We updated "p2mp" (lowercase) to "P2MP" (caps). The capitalized form > is much > > more common in published RFCs, including in RFCs 9026 and 6425, which are > > normatively referenced by this document. > > > > b) 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. > > > > Operations, Administration, and Maintenance (OAM) > > Pseudowire (PW) > > --> > > > > > > 23) <!-- [rfced] Please review the "Inclusive Language" portion of the > online > > Style Guide < > https://urldefense.proofpoint.com/v2/url?u=https-3A__www.rfc-2Deditor.org_styleguide_part2_-23inclusive-5Flanguage&d=DwIFaQ&c=udBTRvFvXC5Dhqg7UHpJlPps3mZ3LRxpb6__0PomBTQ&r=DnUkF34wu4mqq0UY8nn2rxBBO7qOW_D-RfNVLML28ZU&m=N3BN4MbSwbGOc69AWNiXebynGYSo8PiReGCL7rnLHn28J89PfD0Ea_J6-410i0Vh&s=0YTwolTzgM4A0o1_Rx8ZGvr8LJ-MSIn5f1ociq8B728&e= > > > > and let us know if any changes are needed. 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Please use ‘REPLY ALL’, > > as all the parties CCed on this message need to see your approval. > > > > > > Files > > ----- > > > > The files are available here: > > > https://urldefense.proofpoint.com/v2/url?u=https-3A__www.rfc-2Deditor.org_authors_rfc9780.xml&d=DwIFaQ&c=udBTRvFvXC5Dhqg7UHpJlPps3mZ3LRxpb6__0PomBTQ&r=DnUkF34wu4mqq0UY8nn2rxBBO7qOW_D-RfNVLML28ZU&m=N3BN4MbSwbGOc69AWNiXebynGYSo8PiReGCL7rnLHn28J89PfD0Ea_J6-410i0Vh&s=wADd8XD2iogcR0kFeyO5Cj6PAfWEE2APynuirHT4gw8&e= > > > https://urldefense.proofpoint.com/v2/url?u=https-3A__www.rfc-2Deditor.org_authors_rfc9780.html&d=DwIFaQ&c=udBTRvFvXC5Dhqg7UHpJlPps3mZ3LRxpb6__0PomBTQ&r=DnUkF34wu4mqq0UY8nn2rxBBO7qOW_D-RfNVLML28ZU&m=N3BN4MbSwbGOc69AWNiXebynGYSo8PiReGCL7rnLHn28J89PfD0Ea_J6-410i0Vh&s=r9LF3E0YIOPdLRGyrlNosI0Tliz8lfS4W5fm43qQmvg&e= > > > https://urldefense.proofpoint.com/v2/url?u=https-3A__www.rfc-2Deditor.org_authors_rfc9780.pdf&d=DwIFaQ&c=udBTRvFvXC5Dhqg7UHpJlPps3mZ3LRxpb6__0PomBTQ&r=DnUkF34wu4mqq0UY8nn2rxBBO7qOW_D-RfNVLML28ZU&m=N3BN4MbSwbGOc69AWNiXebynGYSo8PiReGCL7rnLHn28J89PfD0Ea_J6-410i0Vh&s=Wsis9RsCjs9vczih6kOyOhD92ZUJKyoyRxwOX9JRJCQ&e= > > > https://urldefense.proofpoint.com/v2/url?u=https-3A__www.rfc-2Deditor.org_authors_rfc9780.txt&d=DwIFaQ&c=udBTRvFvXC5Dhqg7UHpJlPps3mZ3LRxpb6__0PomBTQ&r=DnUkF34wu4mqq0UY8nn2rxBBO7qOW_D-RfNVLML28ZU&m=N3BN4MbSwbGOc69AWNiXebynGYSo8PiReGCL7rnLHn28J89PfD0Ea_J6-410i0Vh&s=qqyxkTyiz9Ezx8zO7_A3QkynrTh_kDxqWSEBol0JXL0&e= > > > > Diff file of the text: > > > https://urldefense.proofpoint.com/v2/url?u=https-3A__www.rfc-2Deditor.org_authors_rfc9780-2Ddiff.html&d=DwIFaQ&c=udBTRvFvXC5Dhqg7UHpJlPps3mZ3LRxpb6__0PomBTQ&r=DnUkF34wu4mqq0UY8nn2rxBBO7qOW_D-RfNVLML28ZU&m=N3BN4MbSwbGOc69AWNiXebynGYSo8PiReGCL7rnLHn28J89PfD0Ea_J6-410i0Vh&s=7Qtu9pOc50rhWo6JMY0voDRoD4WTDOQ1GnZaXmXyVaM&e= > > > https://urldefense.proofpoint.com/v2/url?u=https-3A__www.rfc-2Deditor.org_authors_rfc9780-2Drfcdiff.html&d=DwIFaQ&c=udBTRvFvXC5Dhqg7UHpJlPps3mZ3LRxpb6__0PomBTQ&r=DnUkF34wu4mqq0UY8nn2rxBBO7qOW_D-RfNVLML28ZU&m=N3BN4MbSwbGOc69AWNiXebynGYSo8PiReGCL7rnLHn28J89PfD0Ea_J6-410i0Vh&s=UB2QQjNdKmYGRGFtgbrSpQctutG7oDFRSRNXmOdUIE8&e= > (side by side) > > > > Alt-diff of the text (allows you to more easily view changes > > where text has been deleted or moved): > > > https://urldefense.proofpoint.com/v2/url?u=https-3A__www.rfc-2Deditor.org_authors_rfc9780-2Dalt-2Ddiff.html&d=DwIFaQ&c=udBTRvFvXC5Dhqg7UHpJlPps3mZ3LRxpb6__0PomBTQ&r=DnUkF34wu4mqq0UY8nn2rxBBO7qOW_D-RfNVLML28ZU&m=N3BN4MbSwbGOc69AWNiXebynGYSo8PiReGCL7rnLHn28J89PfD0Ea_J6-410i0Vh&s=jAB0BVRPJ9IrYPO27EpZNVFDvNLU-H65hoJVuuYDLjo&e= > > > > Diff of the XML: > > > https://urldefense.proofpoint.com/v2/url?u=https-3A__www.rfc-2Deditor.org_authors_rfc9780-2Dxmldiff1.html&d=DwIFaQ&c=udBTRvFvXC5Dhqg7UHpJlPps3mZ3LRxpb6__0PomBTQ&r=DnUkF34wu4mqq0UY8nn2rxBBO7qOW_D-RfNVLML28ZU&m=N3BN4MbSwbGOc69AWNiXebynGYSo8PiReGCL7rnLHn28J89PfD0Ea_J6-410i0Vh&s=87aNMgZiXXCNhIDbPUQuMCztccKEeBNlIhsZ5WNOzCI&e= > > > > > > Tracking progress > > ----------------- > > > > The details of the AUTH48 status of your document are here: > > > https://urldefense.proofpoint.com/v2/url?u=https-3A__www.rfc-2Deditor.org_auth48_rfc9780&d=DwIFaQ&c=udBTRvFvXC5Dhqg7UHpJlPps3mZ3LRxpb6__0PomBTQ&r=DnUkF34wu4mqq0UY8nn2rxBBO7qOW_D-RfNVLML28ZU&m=N3BN4MbSwbGOc69AWNiXebynGYSo8PiReGCL7rnLHn28J89PfD0Ea_J6-410i0Vh&s=SJOYZxHPGRrLcTCIP2XQjwXi-eZGXponMC_HamoEiJA&e= > > > > Please let us know if you have any questions. > > > > Thank you for your cooperation, > > > > RFC Editor > > > > -------------------------------------- > > RFC9780 (draft-ietf-mpls-p2mp-bfd-11) > > > > Title : Bidirectional Forwarding Detection (BFD) for > Multipoint Networks over Point-to-Multi-Point MPLS Label Switched Path (LSP) > > Author(s) : G. Mirsky, G. Mishra, D. Eastlake 3rd > > WG Chair(s) : Tarek Saad, Tony Li, Adrian Farrel > > > > Area Director(s) : Jim Guichard, Ketan Talaulikar, Gunter Van de Velde > > > >
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