DLEP DiffServ Aware Credit Window Extension
draft-ietf-manet-dlep-da-credit-extension-21

[Ballot comment]
One small comment —

“when both DiffServ and Ethernet traffic classification are specified for a flow, the Ethertype information takes precedence”

I guess you mean “Ethernet”, not “Ethertype”.

[Ballot discuss]
Here, here! This DISCUSS is just that. A DISCUSSion around how something could be clarified better. I expect it should be fairly easy to address it.

Section 3, paragraph 2
>    If this extension is supported, that support MUST be declare using
>    the Extensions Supported Data Item (see Section 13.6 of [RFC8175]).
>    DiffServ Aware Credit Window Extension Data Items MUST NOT be emitted
>    by a DLEP participant unless such support was specified in the
>    initialization message received from its peer.  The use of the
>    extension defined in this document SHOULD be configurable on both
>    modems and routers.

The document clearly states that the extension needs to be configured on both modems and routers. Further down there are references to "network management mechanisms", which could imply NETCONF/RESTCONF, or they could also imply Syslog but that is not entirely clear reading the document. How exactly is this feature going to be configured or managed? For reference, please refer to Section 3 of RFC 5706.

[Ballot comment]
Section 4:  If changes are made to update the Security Consideration sections of draft-ietf-manet-dlep-traffic-classification and draft-ietf-manet-dlep-credit-flow-control, I recommend this draft reference one or both of those drafts.

Section 4:  Wildcards are literally mentioned only in the Introduction and here. I certainly don't mind the recommendation in this section, but should this be a standalone paragraph?  And should it appear in some/all of the other drafts in the group?

Section 4, last sentence:  Does this apply to the wildcard topic?  Or something else, maybe the second sentence?  I think this section could use some restructuring.

[Ballot discuss]
Here, here! This DISCUSS is just that. A DISCUSSion around how something could be clarified better. I expect it should be fairly easy to address it.

Section 3, paragraph 2
>    If this extension is supported, that support MUST be declare using
>    the Extensions Supported Data Item (see Section 13.6 of [RFC8175]).
>    DiffServ Aware Credit Window Extension Data Items MUST NOT be emitted
>    by a DLEP participant unless such support was specified in the
>    initialization message received from its peer.  The use of the
>    extension defined in this document SHOULD be configurable on both
>    modems and routers.

The document clearly states that the extension needs to be configured on both modems and routers. Further down there are references to "network management mechanisms", which could imply NETCONF/RESTCONF, or they could also imply Syslog but that is not entirely clear reading the document. How exactly is this feature going to be configured if there is no YANG module defined or planned? Can it be explained better?

[Ballot comment]
All comments below are about very minor potential issues that you may choose to
address in some way - or ignore - as you see fit. Some were flagged by
automated tools (via https://github.com/larseggert/ietf-reviewtool), so there
will likely be some false positives. There is no need to let me know what you
did with these suggestions.

Section 1, paragraph 1
>    The Dynamic Link Exchange Protocol (DLEP) is defined in [RFC8175].
>    This protocol provides the exchange of link related control
>    information between DLEP peers.  DLEP peers consist of a modem and a
>    router.  DLEP defines a base set of mechanisms as well as support for
>    possible extensions.  This document defines one such extension.

s/This protocol/The protocol/

Document references draft-ietf-manet-dlep-credit-flow-control-16, but -17 is
the latest available revision.

Document references draft-ietf-manet-dlep-ether-credit-extension-07, but -08 is
the latest available revision.

Section 1, paragraph 2
> ws may be shared or dedicated on a per flow basis. See [I-D.ietf-manet-dlep-e
>                                    ^^^^^^^^
In this context, "per-flow" forms an adjective and is spelled with a hyphen.

Section 2, paragraph 1
>  is supported, that support MUST be declare using the Extensions Supported D
>                                  ^^^^^^^^^^
There may an error in the verb form "be declare".

(Via drafts-lastcall@iana.org): IESG/Authors/WG Chairs:

IANA has completed its review of draft-ietf-manet-dlep-da-credit-extension-17. If any part of this review is inaccurate, please let us know.

IANA understands that, upon approval of this document, there is a single action which we must complete.

In the Extension Type Value Registry in the Dynamic Link Exchange Protocol (DLEP) Parameters registry group located at:

https://www.iana.org/assignments/dlep-parameters/

a single new extension type will be registered from the Specification Required range as follows:

Code: [ TBD-at-Registration ]
Description: DiffServ Aware Credit Window
Reference: [ RFC-to-be ]

As this document requests a registration in an Expert Review or Specification Required (see RFC 8126) registry, we have completed the required Expert Review via a separate request.

We understand that this is the only action required to be completed upon approval of this document.

NOTE: The action requested in this document will not be completed until the document has been approved for publication as an RFC. This message is meant only to confirm the action that will be performed.

For definitions of IANA review states, please see:

https://datatracker.ietf.org/help/state/draft/iana-review

Thank you,

David Dong
IANA Services Sr. Specialist

The following Last Call announcement was sent out (ends 2024-07-09):

From: The IESG
To: IETF-Announce
CC: draft-ietf-manet-dlep-da-credit-extension@ietf.org, james.n.guichard@futurewei.com, manet-chairs@ietf.org, manet@ietf.org, ronald.intvelt@tno.nl
Reply-To: last-call@ietf.org
Sender:
Subject: Last Call:  (DLEP DiffServ Aware Credit Window Extension) to Proposed Standard


The IESG has received a request from the Mobile Ad-hoc Networks WG (manet) to
consider the following document: - 'DLEP DiffServ Aware Credit Window
Extension'
  as Proposed Standard

The IESG plans to make a decision in the next few weeks, and solicits final
comments on this action. Please send substantive comments to the
last-call@ietf.org mailing lists by 2024-07-09. Exceptionally, comments may
be sent to iesg@ietf.org instead. In either case, please retain the beginning
of the Subject line to allow automated sorting.

Abstract


  This document defines an extension to the Dynamic Link Exchange
  Protocol (DLEP) that enables a DiffServ aware credit-window scheme
  for destination-specific and shared flow control.




The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-manet-dlep-da-credit-extension/



No IPR declarations have been submitted directly on this I-D.

Shepherd writeup on draft-ietf-manet-dlep-da-credit-extension

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?

  This document is part of a cluster of four which together specify a
  credit-base flow control extension to the Dynamic Link Exchange Protocol
  (DLEP, RFC8175). The companion documents are:
  - draft-ietf-manet-dlep-credit-flow-control,
  - draft-ietf-manet-dlep-traffic-classification,
  - draft-ietf-manet-dlep-ether-credit-extension.
  There was strong consensus early on in the WG that it would be beneficial
  to have a Flow Control extension to DLEP that is more sophisticated than
  the Control-Plane-based Pause approach specified in RFC 8651. Most of the
  remaining discussion revolved around how to best structure and modularize
  the specification. (See answer to question 2).

2. Was there controversy about particular points, or were there decisions
where the consensus was particularly rough?

  There was discussion (rather than controversy) on how the functional
  elements of credit-based flow control should be distributed over separate
  documents. Between IETF 100 and IETF 103, the specification went from
  being contained in a single document to being broken down into four
  separate ones. Traffic Classification was split off, because it is
  considered a generic mechanism that can be useful for other purposes
  than flow control alone. draft-ietf-manet-dlep-da-credit-extension
  was the original monolithic specification, that was reduced to merely
  defining the Extension Type value after Message and Data Item definitions
  were moved to draft-ietf-manet-dlep-credit-flow-control and
  draft-ietf-manet-dlep-traffic-classification. Using IEEE 802.1Q fields of
  Ethernet frames instead of DS fields in IP packets as an alternative way
  of distinguishing flows made it necessary to define an additional
  Extension Type value in draft-ietf-manet-dlep-ether-credit-extension. The
  motivation for having both Extension Type values in separate documents is
  to allow implementers of DLEP to specify exactly which extensions they
  support by means of RFC numbers. The TSV ART reviewer commented that
  draft-ietf-manet-dlep-da-credit-extension was very light on content and
  strongly suggested to merge this document into
  draft-ietf-manet-dlep-traffic-classification. (At the time,
  draft-ietf-manet-dlep-ether-credit-extension had not yet been subjected to
  TSV ART early review). The WG considered this suggestion around IETF 113
  and again at IETF 115, but decided that reasons for the four-way split
  were still valid and to therefore stick to that structure.

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.)

  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 recommends) or elsewhere (where)?

  This document's shepherd has no knowledge of existing implementations. Since
  this document (and its companions) describes an extension to DLEP (RFC 8175),
  a starting point for an implementation could be the open source DLEP
  library, to which David Wiggins (one of the authors of this
  document) is the main contributor: https://github.com/mit-ll/LL-DLEP .
  There has been some discussion on the mailing list on how to implement the
  router side of credit-based flow control (in Linux, specifically):
  https://mailarchive.ietf.org/arch/msg/manet/MPTLhKgaljq1BRdjE_dEk9x1YhI/

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.

  A TSV ART Early Review took place. Main concern was the split in three
  different documents. (See answer to question 2). Some additional issues have
  been resolved.

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.

  A RtgDir review still needs to take place. None of the other expert
  reviews mentioned (MIB Doctor, etc.) apply to this document.

7. If the document contains a YANG module, has the final version of
the module been checked with any of the recommended validation tools
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?

  This 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.

  This document contains no formal language. The shepherd has
  carefully reviewed this draft, as documented at
https://mailarchive.ietf.org/arch/msg/manet/G2jFmOqhfgToRpnBBvswdopJHwg/
  These comments have been resolved.

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?

  Yes.

10. Several IETF Areas have assembled lists of common issues that
their reviewers encounter. Do any such issues remain that would merit
specific attention from subsequent reviews?

  Shepherd has not identified any such issues.

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

  Standards Track as indicated on the title page. This document and its
  companion documents specify a more sophisticated and finer-grained flow
  control mechanism than the one defined in RFC 8651 (which is a Proposed
  Standard). Moreover, credit-based flow control is an explicit work item
  on the WG's charter, whereas Control-Plane-Based Pause (RFC 8651) was
  not (and was criticized for that reason during IESG review).

12. Has the interested community confirmed that any and all
appropriate IPR disclosures required by BCP 78 and BCP 79 have been
filed? If not, explain why. If yes, summarize any discussion and
conclusion regarding the intellectual property rights (IPR)
disclosures, including links to relevant emails.

  See IPR statements at
https://mailarchive.ietf.org/arch/msg/manet/VmfIkhXerMCx3IXfa7pNfzxH4r8/
https://mailarchive.ietf.org/arch/msg/manet/itiAXwQ7dQaerG43rTH6SXNiDdY/
https://mailarchive.ietf.org/arch/msg/manet/CPfo7N_BrN2V1_GP8n92l3U3Jzw/

  It appears that no IPR is being claimed.

13. Has each Author or Contributor confirmed their willingness to be
listed as such? If the number of Authors/Editors on the front page is
greater than 5, please provide a justification.

  Implicitly as per question 12 above. Sadly, David Wiggins passed away
  in 2023.

14. Identify any remaining I-D nits in this document. (See the idnits
tool and the checkbox items found in Guidelines to Authors of
Internet-Drafts). Simply running the idnits tool is not enough; please
review the entire guidelines document.

  The document adheres to the naming convention for Internet-Drafts.
  The document contains all the required sections. 

15. Should any informative references be normative or vice-versa?

  The shepherd believes the references to be categorized correctly.

16. List any normative references that are not freely available to
anyone. Did the community have sufficient access to review any such
normative references?

  All normative references are to RFCs (or RFCs-to-be, in two cases).

17. Are there any normative downward references (see RFC 3967, BCP
97)? If so, list them.

  There are no downward normative references.

18. Are there normative references to documents that are not ready for
advancement or are otherwise in an unclear state? If they exist, what
is the plan for their completion?

  This document has normative references to two of its companion
  documents (see answer to question 1),
  draft-ietf-manet-dlep-credit-flow-control and
  draft-ietf-manet-dlep-traffic-classification, which are assumed to
  go through post-WG review and processing steps alongside it.

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.

  This document (together with its companion documents, see answer to
  question 1) defines an extension to RFC 8175, in the same way as
  RFC 8629, RFC 8651, RFC 8703 and RFC 8757 do, but it does not change
  the status of RFC 8175 or any other RFC.

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).

  This document adds one entry to the existing DLEP Extensions Registry
  named "Extension Type Values". This addition is in the range with a
  "Specification Required" policy. This document does not create new
  IANA registries. The requested action in the IANA Considerations
  Section (section 5) has been found to be consistent with the body of
  the document.

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.

  This document does not create new IANA registries.

Shepherd writeup on draft-ietf-manet-dlep-da-credit-extension

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?

  This document is part of a cluster of four which together specify a
  credit-base flow control extension to the Dynamic Link Exchange Protocol
  (DLEP, RFC8175). The companion documents are:
  - draft-ietf-manet-dlep-credit-flow-control,
  - draft-ietf-manet-dlep-traffic-classification,
  - draft-ietf-manet-dlep-ether-credit-extension.
  There was strong consensus early on in the WG that it would be beneficial
  to have a Flow Control extension to DLEP that is more sophisticated than
  the Control-Plane-based Pause approach specified in RFC 8651. Most of the
  remaining discussion revolved around how to best structure and modularize
  the specification. (See answer to question 2).

2. Was there controversy about particular points, or were there decisions
where the consensus was particularly rough?

  There was discussion (rather than controversy) on how the functional
  elements of credit-based flow control should be distributed over separate
  documents. Between IETF 100 and IETF 103, the specification went from
  being contained in a single document to being broken down into four
  separate ones. Traffic Classification was split off, because it is
  considered a generic mechanism that can be useful for other purposes
  than flow control alone. draft-ietf-manet-dlep-da-credit-extension
  was the original monolithic specification, that was reduced to merely
  defining the Extension Type value after Message and Data Item definitions
  were moved to draft-ietf-manet-dlep-credit-flow-control and
  draft-ietf-manet-dlep-traffic-classification. Using IEEE 802.1Q fields of
  Ethernet frames instead of DS fields in IP packets as an alternative way
  of distinguishing flows made it necessary to define an additional
  Extension Type value in draft-ietf-manet-dlep-ether-credit-extension. The
  motivation for having both Extension Type values in separate documents is
  to allow implementers of DLEP to specify exactly which extensions they
  support by means of RFC numbers. The TSV ART reviewer commented that
  draft-ietf-manet-dlep-da-credit-extension was very light on content and
  strongly suggested to merge this document into
  draft-ietf-manet-dlep-traffic-classification. (At the time,
  draft-ietf-manet-dlep-ether-credit-extension had not yet been subjected to
  TSV ART early review). The WG considered this suggestion around IETF 113
  and again at IETF 115, but decided that reasons for the four-way split
  were still valid and to therefore stick to that structure.

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.)

  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 recommends) or elsewhere (where)?

  This document's shepherd has no knowledge of existing implementations. Since
  this document (and its companions) describes an extension to DLEP (RFC 8175),
  a starting point for an implementation could be the open source DLEP
  library, to which David Wiggins (one of the authors of this
  document) is the main contributor: https://github.com/mit-ll/LL-DLEP .
  There has been some discussion on the mailing list on how to implement the
  router side of credit-based flow control (in Linux, specifically):
  https://mailarchive.ietf.org/arch/msg/manet/MPTLhKgaljq1BRdjE_dEk9x1YhI/

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.

  A TSV ART Early Review took place. Main concern was the split in three
  different documents. (See answer to question 2). Some additional issues have
  been resolved.

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.

  A RtgDir review still needs to take place. None of the other expert
  reviews mentioned (MIB Doctor, etc.) apply to this document.

7. If the document contains a YANG module, has the final version of
the module been checked with any of the recommended validation tools
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?

  This 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.

  This document contains no formal language. The shepherd has
  carefully reviewed this draft, as documented at
https://mailarchive.ietf.org/arch/msg/manet/G2jFmOqhfgToRpnBBvswdopJHwg/
  These comments have been resolved.

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?

  Yes.

10. Several IETF Areas have assembled lists of common issues that
their reviewers encounter. Do any such issues remain that would merit
specific attention from subsequent reviews?

  Shepherd has not identified any such issues.

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

  Standards Track as indicated on the title page. This document and its
  companion documents specify a more sophisticated and finer-grained flow
  control mechanism than the one defined in RFC 8651 (which is a Proposed
  Standard). Moreover, credit-based flow control is an explicit work item
  on the WG's charter, whereas Control-Plane-Based Pause (RFC 8651) was
  not (and was criticized for that reason during IESG review).

12. Has the interested community confirmed that any and all
appropriate IPR disclosures required by BCP 78 and BCP 79 have been
filed? If not, explain why. If yes, summarize any discussion and
conclusion regarding the intellectual property rights (IPR)
disclosures, including links to relevant emails.

  See IPR statements at
https://mailarchive.ietf.org/arch/msg/manet/VmfIkhXerMCx3IXfa7pNfzxH4r8/
https://mailarchive.ietf.org/arch/msg/manet/itiAXwQ7dQaerG43rTH6SXNiDdY/
https://mailarchive.ietf.org/arch/msg/manet/CPfo7N_BrN2V1_GP8n92l3U3Jzw/

  It appears that no IPR is being claimed.

13. Has each Author or Contributor confirmed their willingness to be
listed as such? If the number of Authors/Editors on the front page is
greater than 5, please provide a justification.

  Implicitly as per question 12 above. Sadly, David Wiggins passed away
  in 2023.

14. Identify any remaining I-D nits in this document. (See the idnits
tool and the checkbox items found in Guidelines to Authors of
Internet-Drafts). Simply running the idnits tool is not enough; please
review the entire guidelines document.

  The document adheres to the naming convention for Internet-Drafts.
  The document contains all the required sections. 

15. Should any informative references be normative or vice-versa?

  The shepherd believes the references to be categorized correctly.

16. List any normative references that are not freely available to
anyone. Did the community have sufficient access to review any such
normative references?

  All normative references are to RFCs (or RFCs-to-be, in two cases).

17. Are there any normative downward references (see RFC 3967, BCP
97)? If so, list them.

  There are no downward normative references.

18. Are there normative references to documents that are not ready for
advancement or are otherwise in an unclear state? If they exist, what
is the plan for their completion?

  This document has normative references to two of its companion
  documents (see answer to question 1),
  draft-ietf-manet-dlep-credit-flow-control and
  draft-ietf-manet-dlep-traffic-classification, which are assumed to
  go through post-WG review and processing steps alongside it.

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.

  This document (together with its companion documents, see answer to
  question 1) defines an extension to RFC 8175, in the same way as
  RFC 8629, RFC 8651, RFC 8703 and RFC 8757 do, but it does not change
  the status of RFC 8175 or any other RFC.

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).

  This document adds one entry to the existing DLEP Extensions Registry
  named "Extension Type Values". This addition is in the range with a
  "Specification Required" policy. This document does not create new
  IANA registries. The requested action in the IANA Considerations
  Section (section 5) has been found to be consistent with the body of
  the document.

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.

  This document does not create new IANA registries.

 
WORK IN PROGRESS

Shepherd writeup on draft-ietf-manet-dlep-da-credit-extension

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?

  This document is part of a cluster of four which together specify a
  credit-base flow control extension to the Dynamic Link Exchange Protocol
  (DLEP, RFC8175). The companion documents are:
  - draft-ietf-manet-dlep-credit-flow-control,
  - draft-ietf-manet-dlep-traffic-classification,
  - draft-ietf-manet-dlep-ether-credit-extension.
  There was strong consensus early on in the WG that it would be beneficial
  to have a Flow Control extension to DLEP that is more sophisticated than
  the Control-Plane-based Pause approach specified in RFC 8651. Most of the
  remaining discussion revolved around how to best structure and modularize
  the specification. (See answer to question 2).

2. Was there controversy about particular points, or were there decisions
where the consensus was particularly rough?

  There was discussion (rather than controversy) on how the functional
  elements of credit-based flow control should be distributed over separate
  documents. Between IETF 100 and IETF 103, the specification went from
  being contained in a single document to being broken down into four
  separate ones. Traffic Classification was split off, because it is
  considered a generic mechanism that can be useful for other purposes
  than flow control alone. draft-ietf-manet-dlep-da-credit-extension
  was the original monolithic specification, that was reduced to merely
  defining the Extension Type value after Message and Data Item definitions
  were moved to draft-ietf-manet-dlep-credit-flow-control and
  draft-ietf-manet-dlep-traffic-classification. Using IEEE 802.1Q fields of
  Ethernet frames instead of DS fields in IP packets as an alternative way
  of distinguishing flows made it necessary to define an additional
  Extension Type value in draft-ietf-manet-dlep-ether-credit-extension. The
  motivation for having both Extension Type values in separate documents is
  to allow implementers of DLEP to specify exactly which extensions they
  support by means of RFC numbers. The TSV ART reviewer commented that
  draft-ietf-manet-dlep-da-credit-extension was very light on content and
  strongly suggested to merge this document into
  draft-ietf-manet-dlep-traffic-classification. (At the time,
  draft-ietf-manet-dlep-ether-credit-extension had not yet been subjected to
  TSV ART early review). The WG considered this suggestion around IETF 113
  and again at IETF 115, but decided that reasons for the four-way split
  were still valid and to therefore stick to that structure.

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.)

  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 recommends) or elsewhere (where)?

  This document's shepherd has no knowledge of existing implementations. Since
  this document (and its companions) describes an extension to DLEP (RFC 8175),
  a starting point for an implementation could be the open source DLEP
  library, to which David Wiggins (one of the authors of this
  document) is the main contributor: https://github.com/mit-ll/LL-DLEP .
  There has been some discussion on the mailing list on how to implement the
  router side of credit-based flow control (in Linux, specifically):
  https://mailarchive.ietf.org/arch/msg/manet/MPTLhKgaljq1BRdjE_dEk9x1YhI/

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.

  A TSV ART Early Review took place. Main concern was the split in three
  different documents. (See answer to question 2). Some lesser issue are
  being resolved.

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.

  A RtgDir review still needs to take place. None of the other expert
  reviews mentioned (MIB Doctor, etc.) apply to this document.

7. If the document contains a YANG module, has the final version of
the module been checked with any of the recommended validation tools
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?

  This 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.

  This document contains no formal language. The shepherd has
  carefully reviewed this draft, as documented at
https://mailarchive.ietf.org/arch/msg/manet/Knm_a-HXt_5i9xlRAnfp7jhLkds/
  (**as WG participant**)
  These comments have been resolved.

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?

  Yes.

10. Several IETF Areas have assembled lists of common issues that
their reviewers encounter. Do any such issues remain that would merit
specific attention from subsequent reviews?

  Shepherd has not identified any such issues.

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

  Standards Track as indicated on the title page. This document and its
  companion documents specify a more sophisticated and finer-grained flow
  control mechanism than the one defined in RFC 8651 (which is a Proposed
  Standard). Moreover, credit-based flow control is an explicit work item
  on the WG's charter, whereas Control-Plane-Based Pause (RFC 8651) was
  not (and was criticized for that reason during IESG review).

12. Has the interested community confirmed that any and all
appropriate IPR disclosures required by BCP 78 and BCP 79 have been
filed? If not, explain why. If yes, summarize any discussion and
conclusion regarding the intellectual property rights (IPR)
disclosures, including links to relevant emails.

  See IPR statements at
https://mailarchive.ietf.org/arch/msg/manet/GZPzumdxzHMIGY_zcnT1milVz0w/
https://mailarchive.ietf.org/arch/msg/manet/itiAXwQ7dQaerG43rTH6SXNiDdY/
https://mailarchive.ietf.org/arch/msg/manet/CPfo7N_BrN2V1_GP8n92l3U3Jzw/

  It appears that no IPR is being claimed.

13. Has each Author or Contributor confirmed their willingness to be
listed as such? If the number of Authors/Editors on the front page is
greater than 5, please provide a justification.

  Implicitly as per question 12 above. Sadly, David Wiggins passed away
  in 2023.

14. Identify any remaining I-D nits in this document. (See the idnits
tool and the checkbox items found in Guidelines to Authors of
Internet-Drafts). Simply running the idnits tool is not enough; please
review the entire guidelines document.

  The document adheres to the naming convention for Internet-Drafts.
  The document contains all the required sections. 

15. Should any informative references be normative or vice-versa?

  The shepherd believes the references to be categorized correctly.

16. List any normative references that are not freely available to
anyone. Did the community have sufficient access to review any such
normative references?

  All normative references are to RFCs (or RFCs-to-be, in two cases).

17. Are there any normative downward references (see RFC 3967, BCP
97)? If so, list them.

  There are no downward normative references.

18. Are there normative references to documents that are not ready for
advancement or are otherwise in an unclear state? If they exist, what
is the plan for their completion?

  This document has normative references to two of its companion
  documents (see answer to question 1),
  draft-ietf-manet-dlep-credit-flow-control and
  draft-ietf-manet-dlep-traffic-classification, which are assumed to
  go through post-WG review and processing steps alongside it.

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.

  This document (together with its companion documents, see answer to
  question 1) defines an extension to RFC 8175, in the same way as
  RFC 8629, RFC 8651, RFC 8703 and RFC 8757 do, but it does not change
  the status of RFC 8175 or any other RFC.

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).

  This document adds one entry to the existing DLEP Extensions Registry
  named "Extension Type Values". This addition is in the range with a
  "Specification Required" policy. This document does not create new
  IANA registries. The requested action in the IANA Considerations
  Section (section 5) has been found to be consistent with the body of
  the document.

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.

  This document does not create new IANA registries.

WORK IN PROGRESS

 
WORK IN PROGRESS

Shepherd writeup on draft-ietf-manet-dlep-da-credit-extension

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?

  This document is part of a cluster of four which together specify a
  credit-base flow control extension to the Dynamic Link Exchange Protocol
  (DLEP, RFC8175). The companion documents are:
  - draft-ietf-manet-dlep-credit-flow-control,
  - draft-ietf-manet-dlep-traffic-classification,
  - draft-ietf-manet-dlep-ether-credit-extension.
  There was strong consensus early on in the WG that it would be beneficial
  to have a Flow Control extension to DLEP that is more sophisticated than
  the Control-Plane-based Pause approach specified in RFC 8651. Most of the
  remaining discussion revolved around how to best structure and modularize
  the specification. (See answer to question 2).

2. Was there controversy about particular points, or were there decisions
where the consensus was particularly rough?

  There was discussion (rather than controversy) on how the functional
  elements of credit-based flow control should be distributed over separate
  documents. Between IETF 100 and IETF 103, the specification went from
  being contained in a single document to being broken down into four
  separate ones. Traffic Classification was split off, because it is
  considered a generic mechanism that can be useful for other purposes
  than flow control alone. draft-ietf-manet-dlep-da-credit-extension
  was the original monolithic specification, that was reduced to merely
  defining the Extension Type value after Message and Data Item definitions
  were moved to draft-ietf-manet-dlep-credit-flow-control and
  draft-ietf-manet-dlep-traffic-classification. Using IEEE 802.1Q fields of
  Ethernet frames instead of DS fields in IP packets as an alternative way
  of distinguishing flows made it necessary to define an additional
  Extension Type value in draft-ietf-manet-dlep-ether-credit-extension. The
  motivation for having both Extension Type values in separate documents is
  to allow implementers of DLEP to specify exactly which extensions they
  support by means of RFC numbers. The TSV ART reviewer commented that
  draft-ietf-manet-dlep-da-credit-extension was very light on content and
  strongly suggested to merge this document into
  draft-ietf-manet-dlep-traffic-classification. (At the time,
  draft-ietf-manet-dlep-ether-credit-extension had not yet been subjected to
  TSV ART early review). The WG considered this suggestion around IETF 113
  and again at IETF 115, but decided that reasons for the four-way split
  were still valid and to therefore stick to that structure.

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.)

  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 recommends) or elsewhere (where)?

  This document's shepherd has no knowledge of existing implementations. Since
  this document (and its companions) describes an extension to DLEP (RFC 8175),
  a starting point for an implementation could be the open source DLEP
  library, to which David Wiggins (one of the authors of this
  document) is the main contributor: https://github.com/mit-ll/LL-DLEP .
  There has been some discussion on the mailing list on how to implement the
  router side of credit-based flow control (in Linux, specifically):
  https://mailarchive.ietf.org/arch/msg/manet/MPTLhKgaljq1BRdjE_dEk9x1YhI/

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.

  A TSV ART Early Review took place. Main concern was the split in three
  different documents. (See answer to question 2). Some lesser issue are
  being resolved.

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.

  A RtgDir review still needs to take place. None of the other expert
  reviews mentioned (MIB Doctor, etc.) apply to this document.

7. If the document contains a YANG module, has the final version of
the module been checked with any of the recommended validation tools
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?

  This 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.

  This document contains no formal language. The shepherd has
  carefully reviewed this draft, as documented at
https://mailarchive.ietf.org/arch/msg/manet/Knm_a-HXt_5i9xlRAnfp7jhLkds/
  (**as WG participant**)
  These comments have been resolved.

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?

  Yes.

10. Several IETF Areas have assembled lists of common issues that
their reviewers encounter. Do any such issues remain that would merit
specific attention from subsequent reviews?

  Shepherd has not identified any such issues.

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

  Standards Track as indicated on the title page. This document and its
  companion documents specify a more sophisticated and finer-grained flow
  control mechanism than the one defined in RFC 8651 (which is a Proposed
  Standard). Moreover, credit-based flow control is an explicit work item
  on the WG's charter, whereas Control-Plane-Based Pause (RFC 8651) was
  not (and was criticized for that reason during IESG review).

12. Has the interested community confirmed that any and all
appropriate IPR disclosures required by BCP 78 and BCP 79 have been
filed? If not, explain why. If yes, summarize any discussion and
conclusion regarding the intellectual property rights (IPR)
disclosures, including links to relevant emails.

  See IPR statments at
https://mailarchive.ietf.org/arch/msg/manet/GZPzumdxzHMIGY_zcnT1milVz0w/
https://mailarchive.ietf.org/arch/msg/manet/itiAXwQ7dQaerG43rTH6SXNiDdY/
  (IPR statement by Bow-Nan Cheng is still pending, but his affiliation is
  the same as that of David Wiggins; it therefore seems unlikely that the
  former is aware of IPR of which the latter is not aware).

  It appears that no IPR is being claimed.

13. Has each Author or Contributor confirmed their willingness to be
listed as such? If the number of Authors/Editors on the front page is
greater than 5, please provide a justification.

  Implicitly as per question 12 above.

14. Identify any remaining I-D nits in this document. (See the idnits
tool and the checkbox items found in Guidelines to Authors of
Internet-Drafts). Simply running the idnits tool is not enough; please
review the entire guidelines document.

  The document adheres to the naming convention for Internet-Drafts.
  The document contains all the required sections. 

15. Should any informative references be normative or vice-versa?

  The shepherd believes the references to be categorized correctly.

16. List any normative references that are not freely available to
anyone. Did the community have sufficient access to review any such
normative references?

  All normative references are to RFCs (or RFCs-to-be, in two cases).

17. Are there any normative downward references (see RFC 3967, BCP
97)? If so, list them.

  There are no downward normative references.

18. Are there normative references to documents that are not ready for
advancement or are otherwise in an unclear state? If they exist, what
is the plan for their completion?

  This document has normative references to two of its companion
  documents (see answer to question 1),
  draft-ietf-manet-dlep-credit-flow-control and
  draft-ietf-manet-dlep-traffic-classification, which are assumed to
  go through post-WG review and processing steps alongside it.

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.

  This document (together with its companion documents, see answer to
  question 1) defines an extension to RFC 8175, in the same way as
  RFC 8629, RFC 8651, RFC 8703 and RFC 8757 do, but it does not change
  the status of RFC 8175 or any other RFC.

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).

  This document adds one entry to the existing DLEP Extensions Registry
  named "Extension Type Values". This addition is in the range with a
  "Specification Required" policy. This document does not create new
  IANA registries. The requested action in the IANA Considerations
  Section (section 5) has been found to be consistent with the body of
  the document.

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.

  This document does not create new IANA registries.

WORK IN PROGRESS

 
WORK IN PROGRESS

Shepherd writeup on draft-ietf-manet-dlep-da-credit-extension

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?

  This document is part of a cluster of four which together specify a
  credit-base flow control extension to the Dynamic Link Exchange Protocol
  (DLEP, RFC8175). The companion documents are:
  - draft-ietf-manet-dlep-credit-flow-control,
  - draft-ietf-manet-dlep-traffic-classification,
  - draft-ietf-manet-dlep-ether-credit-extension.
  There was strong consensus early on in the WG that it would be beneficial
  to have a Flow Control extension to DLEP that is more sophisticated than
  the Control-Plane-based Pause approach specified in RFC 8651. Most of the
  remaining discussion revolved around how to best structure and modularize
  the specification. (See answer to question 2).

2. Was there controversy about particular points, or were there decisions
where the consensus was particularly rough?

  There was discussion (rather than controversy) on how the functional
  elements of credit-based flow control should be distributed over separate
  documents. Between IETF 100 and IETF 103, the specification went from
  being contained in a single document to being broken down into four
  separate ones. Traffic Classification was split off, because it is
  considered a generic mechanism that can be useful for other purposes
  than flow control alone. draft-ietf-manet-dlep-da-credit-extension
  was the original monolithic specification, that was reduced to merely
  defining the Extension Type value after Message and Data Item definitions
  were moved to draft-ietf-manet-dlep-credit-flow-control and
  draft-ietf-manet-dlep-traffic-classification. Using IEEE 802.1Q fields of
  Ethernet frames instead of DS fields in IP packets as an alternative way
  of distinguishing flows made it necessary to define an additional
  Extension Type value in draft-ietf-manet-dlep-ether-credit-extension. The
  motivation for having both Extension Type values in separate documents is
  to allow implementers of DLEP to specify exactly which extensions they
  support by means of RFC numbers. The TSV ART reviewer commented that
  draft-ietf-manet-dlep-da-credit-extension was very light on content and
  strongly suggested to merge this document into
  draft-ietf-manet-dlep-da-credit-extension. (At the time,
  draft-ietf-manet-dlep-ether-credit-extension had not yet been subjected to
  TSV ART early review). The WG considered this suggestion around IETF 113
  and again at IETF 115, but decided that reasons for the four-way split
  were still valid and to therefore stick to that structure.

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.)

  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 recommends) or elsewhere (where)?

  This document's shepherd has no knowledge of existing implementations. Since
  this document (and its companions) describes an extension to DLEP (RFC 8175),
  a starting point for an implementation could be the open source DLEP
  library, to which David Wiggins (one of the authors of this
  document) is the main contributor: https://github.com/mit-ll/LL-DLEP .
  There has been some discussion on the mailing list on how to implement the
  router side of credit-based flow control (in Linux, specifically):
  https://mailarchive.ietf.org/arch/msg/manet/MPTLhKgaljq1BRdjE_dEk9x1YhI/

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.

  A TSV ART Early Review took place. Main concern was the split in three
  different documents. (See answer to question 2). Some lesser issue are
  being resolved.

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.

  A RtgDir review still needs to take place. None of the other expert
  reviews mentioned (MIB Doctor, etc.) apply to this document.

7. If the document contains a YANG module, has the final version of
the module been checked with any of the recommended validation tools
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?

  This 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.

  This document contains no formal language. The shepherd has
  carefully reviewed this draft, as documented at
https://mailarchive.ietf.org/arch/msg/manet/Knm_a-HXt_5i9xlRAnfp7jhLkds/
  (**as WG participant**)
  These comments have been resolved.

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?

  Yes.

10. Several IETF Areas have assembled lists of common issues that
their reviewers encounter. Do any such issues remain that would merit
specific attention from subsequent reviews?

  Shepherd has not identified any such issues.

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

  Standards Track as indicated on the title page. This document and its
  companion documents specify a more sophisticated and finer-grained flow
  control mechanism than the one defined in RFC 8651 (which is a Proposed
  Standard). Moreover, credit-based flow control is an explicit work item
  on the WG's charter, whereas Control-Plane-Based Pause (RFC 8651) was
  not (and was criticized for that reason during IESG review).

12. Has the interested community confirmed that any and all
appropriate IPR disclosures required by BCP 78 and BCP 79 have been
filed? If not, explain why. If yes, summarize any discussion and
conclusion regarding the intellectual property rights (IPR)
disclosures, including links to relevant emails.

  See IPR statments at
https://mailarchive.ietf.org/arch/msg/manet/GZPzumdxzHMIGY_zcnT1milVz0w/
https://mailarchive.ietf.org/arch/msg/manet/itiAXwQ7dQaerG43rTH6SXNiDdY/
  (IPR statement by Bow-Nan Cheng is still pending, but his affiliation is
  the same as that of David Wiggins; it therefore seems unlikely that the
  former is aware of IPR of which the latter is not aware).

  It appears that no IPR is being claimed.

13. Has each Author or Contributor confirmed their willingness to be
listed as such? If the number of Authors/Editors on the front page is
greater than 5, please provide a justification.

  Implicitly as per question 12 above.

14. Identify any remaining I-D nits in this document. (See the idnits
tool and the checkbox items found in Guidelines to Authors of
Internet-Drafts). Simply running the idnits tool is not enough; please
review the entire guidelines document.

  The document adheres to the naming convention for Internet-Drafts.
  The document contains all the required sections. 

15. Should any informative references be normative or vice-versa?

  The shepherd believes the references to be categorized correctly.

16. List any normative references that are not freely available to
anyone. Did the community have sufficient access to review any such
normative references?

  All normative references are to RFCs (or RFCs-to-be, in two cases).

17. Are there any normative downward references (see RFC 3967, BCP
97)? If so, list them.

  There are no downward normative references.

18. Are there normative references to documents that are not ready for
advancement or are otherwise in an unclear state? If they exist, what
is the plan for their completion?

  This document hasnormative reference to two of its companion
  documents (see answer to question 1),
  draft-ietf-manet-dlep-credit-flow-control and
  draft-ietf-manet-dlep-traffic-classification, which are assumed to
  go through post-WG review and processing steps alongside it.

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.

  This document (together with its companion documents, see answer to
  question 1) defines an extension to RFC 8175, in the same way as
  RFC 8629, RFC 8651, RFC 8703 and RFC 8757 do, but it does not change
  the status of RFC 8175 or any other RFC.

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).

  This document adds one entry to the existing DLEP Extensions Registry
  named "Extension Type Values". This addition is in the range with a
  "Specification Required" policy. This document does not create new
  IANA registries. The requested action in the IANA Considerations
  Section (section 5) has been found to be consistent with the body of
  the document.

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.

  This document does not create new IANA registries.

WORK IN PROGRESS