Egress Validation in Label Switched Path Ping and Traceroute Mechanisms
draft-ietf-mpls-egress-tlv-for-nil-fec-12

## Document History

1. Does the working group (WG) consensus represent the strong concurrence of a
  few individuals, with others being silent, or did it reach broad agreement?
[Ans]: The WG consensus represents broad agreement.

2. Was there controversy about particular points, or were there decisions where
  the consensus was particularly rough?
[Ans]: No.

3. Has anyone threatened an appeal or otherwise indicated extreme discontent? If
  so, please summarize the areas of conflict in separate email messages to the
  responsible Area Director. (It should be in a separate email because this
  questionnaire is publicly available.)
[Ans]: No.

4. For protocol documents, are there existing implementations of the contents of
  the document? Have a significant number of potential implementers indicated
  plans to implement? Are any existing implementations reported somewhere,
  either in the document itself (as [RFC 7942][3] recommends) or elsewhere
  (where)?
[Ans]:An Implementations Status was added in Section 8 of the document.

## Additional Reviews

5. Do the contents of this document closely interact with technologies in other
  IETF working groups or external organizations, and would it therefore benefit
  from their review? Have those reviews occurred? If yes, describe which
  reviews took place.
[Ans]: no, the contents propose extensions to procedures of Nil FEC described in RFC8029.

6. Describe how the document meets any required formal expert review criteria,
  such as the MIB Doctor, YANG Doctor, media type, and URI type reviews.
[Ans]: Yes, MPLS review team members reviewed before adoption by the WG.
Further early reviews by the RTGDIR members and all comments have been addressed.

7. If the document contains a YANG module, has the final version of the module
  been checked with any of the [recommended validation tools][4] for syntax and
  formatting validation? If there are any resulting errors or warnings, what is
  the justification for not fixing them at this time? Does the YANG module
  comply with the Network Management Datastore Architecture (NMDA) as specified
  in [RFC 8342][5]?
[Ans]: Document does not contain a YANG module.

8. Describe reviews and automated checks performed to validate sections of the
  final version of the document written in a formal language, such as XML code,
  BNF rules, MIB definitions, CBOR's CDDL, etc.
[Ans]: not applicable.

## Document Shepherd Checks

9. Based on the shepherd's review of the document, is it their opinion that this
  document is needed, clearly written, complete, correctly designed, and ready
  to be handed off to the responsible Area Director?
[Ans]: The document has useful extensions to procedures described in RFC8029 when using Nil FEC.
It proposes the addition of a new Egress TLV that contains the egress information along
with the FEC Stack TLV with the Nil FEC to help in validating the Nil-FEC on the receiving
router.

10. Several IETF Areas have assembled [lists of common issues that their
    reviewers encounter][6]. For which areas have such issues been identified
    and addressed? For which does this still need to happen in subsequent
    reviews?
[Ans]: The RTG-DIR was engaged to perform early review.

11. What type of RFC publication is being requested on the IETF stream ([Best
    Current Practice][12], [Proposed Standard, Internet Standard][13],
    [Informational, Experimental or Historic][14])? Why is this the proper type
    of RFC? Do all Datatracker state attributes correctly reflect this intent?
[Ans]: Proposed Standard.

12. Have reasonable efforts been made to remind all authors of the intellectual
    property rights (IPR) disclosure obligations described in [BCP 79][7]? To
    the best of your knowledge, have all required disclosures been filed? If
    not, explain why. If yes, summarize any relevant discussion, including links
    to publicly-available messages when applicable.
[Ans]: A first IPR poll was done before adoption of the document. A second IPR
poll was done before WGLC. There following IPR is disclosed against this document:
https://datatracker.ietf.org/ipr/5656/

13. Has each author, editor, and contributor shown their willingness to be
    listed as such? If the total number of authors and editors on the front page
    is greater than five, please provide a justification.
[Ans]: Currently, the document has 5 authors at the front page.

14. Document any remaining I-D nits in this document. Simply running the [idnits
    tool][8] is not enough; please review the ["Content Guidelines" on
    authors.ietf.org][15]. (Also note that the current idnits tool generates
    some incorrect warnings; a rewrite is underway.)
[Ans]: No Nits warnings or errors exist in the current state.

15. Should any informative references be normative or vice-versa? See the [IESG
    Statement on Normative and Informative References][16].
[Ans]: None identified.

16. List any normative references that are not freely available to anyone. Did
    the community have sufficient access to review any such normative
    references?
[Ans]: None.

17. Are there any normative downward references (see [RFC 3967][9] and [BCP
    97][10]) that are not already listed in the [DOWNREF registry][17]? If so,
    list them.
[Ans]: None.

18. Are there normative references to documents that are not ready to be
    submitted to the IESG for publication or are otherwise in an unclear state?
    If so, what is the plan for their completion?
[Ans]: None.

19. Will publication of this document change the status of any existing RFCs? If
    so, does the Datatracker metadata correctly reflect this and are those RFCs
    listed on the title page, in the abstract, and discussed in the
    introduction? If not, explain why and point to the part of the document
    where the relationship of this document to these other RFCs is discussed.
[Ans]: No.

20. Describe the document shepherd's review of the IANA considerations section,
    especially with regard to its consistency with the body of the document.
    Confirm that all aspects of the document requiring IANA assignments are
    associated with the appropriate reservations in IANA registries. Confirm
    that any referenced IANA registries have been clearly identified. Confirm
    that each newly created IANA registry specifies its initial contents,
    allocations procedures, and a reasonable name (see [RFC 8126][11]).
[Ans]:

The IANA considerations section of the document contains a request for two allocations as
follows (see also
https://www.iana.org/assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-parameters.txt):

1. [IANA] has assigned an early allocation from the TLVs Sub-Registry of optional TLVs range
(range of TLVs that can be silently dropped if not recognized) on 2023-10-05:

    Value Description Reference
    32771 Egress TLV Section 3 of this document

A prior allocation for the same  above TLV was deprecated as it came from the range of
non-optional TLVs (range for TLVs that require an error message if not recognized]).
The prior allocation is currently marked as DEPRECATED in IANA's table.

    28      EGRESS TLV  [draft-ietf-mpls-egress-tlv-for-nil-fec-01] No Sub-TLVs
            (DEPRECATED)

2.  [IANA] has assigned an early allocation for the Return Code for
"Replying router is an egress for the prefix in Egress TLV" in the "Multi-Protocol Label
Switching (MPLS) Label Switched Paths (LSPs) Ping Parameters" in "Return Codes"
sub-registry.


  Value Description Reference
  36     Replying router is an egress for the prefix in Egress TLV for the FEC
            at stack depth RSC


21. List any new IANA registries that require Designated Expert Review for
    future allocations. Are the instructions to the Designated Expert clear?
    Please include suggestions of designated experts, if appropriate.
[Ans]: None.

[1]: https://www.ietf.org/about/groups/iesg/
[2]: https://www.rfc-editor.org/rfc/rfc4858.html
[3]: https://www.rfc-editor.org/rfc/rfc7942.html
[4]: https://trac.ietf.org/trac/ops/wiki/yang-review-tools
[5]: https://www.rfc-editor.org/rfc/rfc8342.html
[6]: https://trac.ietf.org/trac/iesg/wiki/ExpertTopics
[7]: https://www.rfc-editor.org/info/bcp79
[8]: https://www.ietf.org/tools/idnits/
[9]: https://www.rfc-editor.org/rfc/rfc3967.html
[10]: https://www.rfc-editor.org/info/bcp97
[11]: https://www.rfc-editor.org/rfc/rfc8126.html
[12]: https://www.rfc-editor.org/rfc/rfc2026.html#section-5
[13]: https://www.rfc-editor.org/rfc/rfc2026.html#section-4.1
[14]: https://www.rfc-editor.org/rfc/rfc2026.html#section-4.2
[15]: https://authors.ietf.org/en/content-guidelines-overview
[16]:
https://www.ietf.org/about/groups/iesg/statements/normative-informative-references/
[17]: https://datatracker.ietf.org/doc/downref/

## Document History

1. Does the working group (WG) consensus represent the strong concurrence of a
  few individuals, with others being silent, or did it reach broad agreement?
[Ans]: The WG consensus represents broad agreement.

2. Was there controversy about particular points, or were there decisions where
  the consensus was particularly rough?
[Ans]: No.

3. Has anyone threatened an appeal or otherwise indicated extreme discontent? If
  so, please summarize the areas of conflict in separate email messages to the
  responsible Area Director. (It should be in a separate email because this
  questionnaire is publicly available.)
[Ans]: No.

4. For protocol documents, are there existing implementations of the contents of
  the document? Have a significant number of potential implementers indicated
  plans to implement? Are any existing implementations reported somewhere,
  either in the document itself (as [RFC 7942][3] recommends) or elsewhere
  (where)?
[Ans]:An Implementations Status was added in Section 8 of the document.

## Additional Reviews

5. Do the contents of this document closely interact with technologies in other
  IETF working groups or external organizations, and would it therefore benefit
  from their review? Have those reviews occurred? If yes, describe which
  reviews took place.
[Ans]: no, the contents propose extensions to procedures of Nil FEC described in RFC8029.

6. Describe how the document meets any required formal expert review criteria,
  such as the MIB Doctor, YANG Doctor, media type, and URI type reviews.
[Ans]: Yes, MPLS review team members reviewed before adoption by the WG.
Further early reviews by the RTGDIR members and all comments have been addressed.

7. If the document contains a YANG module, has the final version of the module
  been checked with any of the [recommended validation tools][4] for syntax and
  formatting validation? If there are any resulting errors or warnings, what is
  the justification for not fixing them at this time? Does the YANG module
  comply with the Network Management Datastore Architecture (NMDA) as specified
  in [RFC 8342][5]?
[Ans]: Document does not contain a YANG module.

8. Describe reviews and automated checks performed to validate sections of the
  final version of the document written in a formal language, such as XML code,
  BNF rules, MIB definitions, CBOR's CDDL, etc.
[Ans]: not applicable.

## Document Shepherd Checks

9. Based on the shepherd's review of the document, is it their opinion that this
  document is needed, clearly written, complete, correctly designed, and ready
  to be handed off to the responsible Area Director?
[Ans]: The document has useful extensions to procedures described in RFC8029 when using Nil FEC.
It proposes the addition of a new Egress TLV that contains the egress information along
with the FEC Stack TLV with the Nil FEC to help in validating the Nil-FEC on the receiving
router.

10. Several IETF Areas have assembled [lists of common issues that their
    reviewers encounter][6]. For which areas have such issues been identified
    and addressed? For which does this still need to happen in subsequent
    reviews?
[Ans]: The RTG-DIR was engaged to perform early review.

11. What type of RFC publication is being requested on the IETF stream ([Best
    Current Practice][12], [Proposed Standard, Internet Standard][13],
    [Informational, Experimental or Historic][14])? Why is this the proper type
    of RFC? Do all Datatracker state attributes correctly reflect this intent?
[Ans]: Proposed Standard.

12. Have reasonable efforts been made to remind all authors of the intellectual
    property rights (IPR) disclosure obligations described in [BCP 79][7]? To
    the best of your knowledge, have all required disclosures been filed? If
    not, explain why. If yes, summarize any relevant discussion, including links
    to publicly-available messages when applicable.
[Ans]: A first IPR poll was done before adoption of the document. A second IPR
poll was done before WGLC. There following IPR is disclosed against this document:
https://datatracker.ietf.org/ipr/5656/

13. Has each author, editor, and contributor shown their willingness to be
    listed as such? If the total number of authors and editors on the front page
    is greater than five, please provide a justification.
[Ans]: Currently, the document has 5 authors at the front page.

14. Document any remaining I-D nits in this document. Simply running the [idnits
    tool][8] is not enough; please review the ["Content Guidelines" on
    authors.ietf.org][15]. (Also note that the current idnits tool generates
    some incorrect warnings; a rewrite is underway.)
[Ans]: No Nits warnings or errors exist in the current state.

15. Should any informative references be normative or vice-versa? See the [IESG
    Statement on Normative and Informative References][16].
[Ans]: None identified.

16. List any normative references that are not freely available to anyone. Did
    the community have sufficient access to review any such normative
    references?
[Ans]: None.

17. Are there any normative downward references (see [RFC 3967][9] and [BCP
    97][10]) that are not already listed in the [DOWNREF registry][17]? If so,
    list them.
[Ans]: None.

18. Are there normative references to documents that are not ready to be
    submitted to the IESG for publication or are otherwise in an unclear state?
    If so, what is the plan for their completion?
[Ans]: None.

19. Will publication of this document change the status of any existing RFCs? If
    so, does the Datatracker metadata correctly reflect this and are those RFCs
    listed on the title page, in the abstract, and discussed in the
    introduction? If not, explain why and point to the part of the document
    where the relationship of this document to these other RFCs is discussed.
[Ans]: No.

20. Describe the document shepherd's review of the IANA considerations section,
    especially with regard to its consistency with the body of the document.
    Confirm that all aspects of the document requiring IANA assignments are
    associated with the appropriate reservations in IANA registries. Confirm
    that any referenced IANA registries have been clearly identified. Confirm
    that each newly created IANA registry specifies its initial contents,
    allocations procedures, and a reasonable name (see [RFC 8126][11]).
[Ans]:

The IANA considerations section of the document contains a request for two allocations as
follows (see also
https://www.iana.org/assignments/mpls-lsp-ping-parameters/mpls-lsp-ping-parameters.txt):

1. [IANA] has assigned an early allocation from the TLVs Sub-Registry of optional TLVs range
(range of TLVs that can be silently dropped if not recognized) on 2023-10-05:

    Value Description Reference
    32771 Egress TLV Section 3 of this document

A prior allocation for the same  above TLV was deprecated as it came from the range of
non-optional TLVs (range for TLVs that require an error message if not recognized]).
The prior allocation is currently marked as DEPRECATED in IANA's table.

    28      EGRESS TLV  [draft-ietf-mpls-egress-tlv-for-nil-fec-01] No Sub-TLVs
            (DEPRECATED)

2.  [IANA] has assigned an early allocation for the Return Code for
"Replying router is an egress for the prefix in Egress TLV" in the "Multi-Protocol Label
Switching (MPLS) Label Switched Paths (LSPs) Ping Parameters" in "Return Codes"
sub-registry.


  Value Description Reference
  36     Replying router is an egress for the prefix in Egress TLV for the FEC
            at stack depth RSC


21. List any new IANA registries that require Designated Expert Review for
    future allocations. Are the instructions to the Designated Expert clear?
    Please include suggestions of designated experts, if appropriate.
[Ans]: None.

[1]: https://www.ietf.org/about/groups/iesg/
[2]: https://www.rfc-editor.org/rfc/rfc4858.html
[3]: https://www.rfc-editor.org/rfc/rfc7942.html
[4]: https://trac.ietf.org/trac/ops/wiki/yang-review-tools
[5]: https://www.rfc-editor.org/rfc/rfc8342.html
[6]: https://trac.ietf.org/trac/iesg/wiki/ExpertTopics
[7]: https://www.rfc-editor.org/info/bcp79
[8]: https://www.ietf.org/tools/idnits/
[9]: https://www.rfc-editor.org/rfc/rfc3967.html
[10]: https://www.rfc-editor.org/info/bcp97
[11]: https://www.rfc-editor.org/rfc/rfc8126.html
[12]: https://www.rfc-editor.org/rfc/rfc2026.html#section-5
[13]: https://www.rfc-editor.org/rfc/rfc2026.html#section-4.1
[14]: https://www.rfc-editor.org/rfc/rfc2026.html#section-4.2
[15]: https://authors.ietf.org/en/content-guidelines-overview
[16]:
https://www.ietf.org/about/groups/iesg/statements/normative-informative-references/
[17]: https://datatracker.ietf.org/doc/downref/