[mpls] Re: [RTG-DIR]Rtgdir last call review of draft-ietf-mpls-msd-yang-07

mohamed.boucadair@orange.com Wed, 05 June 2024 08:34 UTC

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To: Yingzhen Qu <yingzhen.ietf@gmail.com>
Thread-Topic: [RTG-DIR]Rtgdir last call review of draft-ietf-mpls-msd-yang-07
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Date: Wed, 05 Jun 2024 08:16:42 +0000
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CC: Dhruv Dhody <dd@dhruvdhody.com>, "rtg-dir@ietf.org" <rtg-dir@ietf.org>, "draft-ietf-mpls-msd-yang.all@ietf.org" <draft-ietf-mpls-msd-yang.all@ietf.org>, "last-call@ietf.org" <last-call@ietf.org>, "mpls@ietf.org" <mpls@ietf.org>
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Subject: [mpls] Re: [RTG-DIR]Rtgdir last call review of draft-ietf-mpls-msd-yang-07
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Hi Yingzhen,

Thanks for taking care of this. The new version looks better.

Still, I don’t see how the hierarchical identity structure can be automatically inferred from the current flat registry structure. I’m afraid that the instructions in the 3rd para of 6.2 are not sufficient as I don’t think that we can trust the presence of SRH or some magic words in the description to decide which identity to use, and more generally if “a new data plane” is used.

Both the description and references listed in the IANA module diverge from the actual content of the registry. I would avoid that. Please refer to this clarification in the 8407bis (see the last sentence, in particular):

   The content of these registries are usually available using various
   formats (e.g., plain text, XML).  However, there were some confusion
   in the past about whether the content of some registries is dependent
   on a specific representation format.  For example, Section 5 of
   [RFC8892] was published to clarify that MIB and YANG modules are
   merely additional formats in which the "Interface Types (ifType)" and
   "Tunnel Types (tunnelType)" registries are available.  The MIB
   [RFC2863] and YANG modules [RFC7224][RFC8675] are not separate
   registries, and the same values are always present in all formats of
   the same registry.

Some other misc. comments:

(1) “lower-case version of the data plane name”: you may also indicate that the space is replaced with “-“, not trimmed.

(2)    "description":  Replicates the description from the registry.

I guess you meant replicate the “name” from the registry. There is no description in the IGP MSD Type reg.

(3)

OLD:
      name: iana-msd-types
      namespace: urn:ietf:params:xml:ns:yang:iana-msd-types
      prefix: iana-msd-types
      reference: RFC XXXX

      name: ietf-mpls-msd
      namespace: urn:ietf:params:xml:ns:yang:ietf-mpls-msd
      prefix: mpls-msd
     reference: RFC XXXX

NEW:
      name: iana-msd-types
      namespace: urn:ietf:params:xml:ns:yang:iana-msd-types
      prefix: iana-msd-types
      maintained by IANA? Y
      reference: RFC XXXX

      name: ietf-mpls-msd
      namespace: urn:ietf:params:xml:ns:yang:ietf-mpls-msd
      prefix: mpls-msd
      maintained by IANA? N
     reference: RFC XXXX

(4) the security section does not follow the template + does not cover the IANA module. Please refer to https://datatracker.ietf.org/doc/html/draft-ietf-netmod-rfc8407bis-11#name-security-considerations-sect.

Cheers,
Med

De : Yingzhen Qu <yingzhen.ietf@gmail.com>
Envoyé : mercredi 5 juin 2024 07:55
À : BOUCADAIR Mohamed INNOV/NET <mohamed.boucadair@orange.com>
Cc : Dhruv Dhody <dd@dhruvdhody.com>; rtg-dir@ietf.org; draft-ietf-mpls-msd-yang.all@ietf.org; last-call@ietf.org; mpls@ietf.org
Objet : Re: [RTG-DIR]Rtgdir last call review of draft-ietf-mpls-msd-yang-07

Hi Mohamed,

Thanks for the review and pointer. I've uploaded version -08 to address your comments, please review and let me know your comments, especially about the hierarchical identities.

Thanks,
Yingzhen

On Tue, Jun 4, 2024 at 12:18 AM <mohamed.boucadair@orange.com<mailto:mohamed.boucadair@orange.com>> wrote:
Hi all,

In addition to the comments raised by Dhruv, the authors may look at the guidance at https://datatracker.ietf.org/doc/html/draft-ietf-netmod-rfc8407bis-11#name-iana-maintained-modules for the required details for IANA-maintained modules.

## Lack of the details to maintain the module

There is currently no guidance in draft-ietf-mpls-msd-yang about how the module will be maintained. For example, given that there is no label but only a description field in the authoritative IANA registry, the doc should explain how names will be echoed in the module.

## Mirror the content of the authoritative registry

The content of the IANA module does not mirror the details in the registry. For example, there are many refs that are listed in draft-ietf-mpls-msd-yang, but those are not present in the parent registry.

## Hierarchy

The IANA module defines this hierarchy, while there is no such hierarchy in the IANA registry. I understand that the authors want to structure the types, but is this really required here? Absent guidance about how new entries will be echoed from the registry, I don't think this structure is easily maintainable. Please keep in mind that registrants of new types are not even aware that an IANA-maintained module exists. So, they cannot be involved in the process of maintaining the module.

==
     identity msd-base-srh {
       base msd-base;
       description
         "Identity for MSD types for Segment Routing Header (SRH).";
     }

     identity msd-srh-max-sl {
       base msd-base-srh;
       description
         "The Maximum Segment Left MSD type.";
       reference
         "RFC 9352: IS-IS Extensions to Support Segment Routing
                    over the IPv6 Data Plane";
     }

     identity msd-srh-max-end-pop {
       base msd-base-srh;
       description
         "The Maximum End Pop MSD Type.";
       reference
         "RFC 9352: IS-IS Extensions to Support Segment Routing
                    over the IPv6 Data Plane";
     }
==

Hope this helps.

Cheers,
Med

> -----Message d'origine-----
> De : Dhruv Dhody via Datatracker <noreply@ietf.org<mailto:noreply@ietf.org>>
> Envoyé : lundi 3 juin 2024 20:06
> À : rtg-dir@ietf.org<mailto:rtg-dir@ietf.org>
> Cc : draft-ietf-mpls-msd-yang.all@ietf.org<mailto:draft-ietf-mpls-msd-yang.all@ietf.org>; last-call@ietf.org<mailto:last-call@ietf.org>;
> mpls@ietf.org<mailto:mpls@ietf.org>
> Objet : [RTG-DIR]Rtgdir last call review of draft-ietf-mpls-msd-
> yang-07
>
>
> Reviewer: Dhruv Dhody
> Review result: Has Issues
>
> Hello,
>
> I have been selected as the Routing Directorate reviewer for this
> draft. The Routing Directorate seeks to review all routing or
> routing-related drafts as they pass through the IETF last call
> and IESG review, and sometimes on special request. The purpose of
> the review is to assist the Routing ADs. For more information
> about the Routing Directorate, please see
> https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2<https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%252>
> Fwiki.ietf.org<http://fwiki.ietf.org/>%2Fen%2Fgroup%2Frtg%2FRtgDir&data=05%7C02%7Cmohamed
> .boucadair%40orange.com<http://40orange.com/>%7C6ecf264db0bb43052c3b08dc83f8121b%7C90c7
> a20af34b40bfbc48b9253b6f5d20%7C0%7C0%7C638530348673738183%7CUnkno
> wn%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1h
> aWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=vfo%2F%2BxP9zc3YIrI1b9RjmRl
> XL3MicMrirSECkDHfM3c%3D&reserved=0
>
> Although these comments are primarily for the use of the Routing
> ADs, it would be helpful if you could consider them along with
> any other IETF Last Call comments that you receive, and strive to
> resolve them through discussion or by updating the draft.
>
> Document: draft-ietf-mpls-msd-yang-07
> Reviewer: Dhruv Dhody
> Review Date: 2024-06-03
> IETF LC End Date: 2024-06-04
> Intended Status: Proposed Standard
>
> ## Summary:
>
> * I have some minor concerns about this document that I think
> should be resolved before publication.
>
> ## Comment:
>
> * This draft defines 2 YANG models one is IANA-maintained to
> mirror the msd-type registry and the other is augmenting base
> MPLS to include MSD values.
>
> ### Major Issues:
>
> - Please remove the BCP14 boilerplate (Section 1.1) as you are
> not using any of those keywords. Also, remove from the ietf-mpls-
> msd YANG model.
>
> - You should explicitly state that this is an initial version of
> "iana-msd-types" YANG model - "This document defines the initial
> version of the IANA-maintained 'iana-msd-types' YANG module."
>
> ### Minor Issues:
>
> - Title: Please change to "A YANG Data Model for MPLS Maximum
> Segment Identifier (SID) Depth (MSD)". Also, update the reference
> in the YANG model around RFC XXXX.
>
> - The abstract suggests that only one YANG model is defined in
> this I-D.
> Consider rephrasing or adding some hints about the IANA model as
> well.
>
> - Section 1, "YANG [RFC7950] is a data definition language.."; I
> suggest changing it to data modeling as that is the term used in
> the referenced RFC.
>
> - Section 1, I am unsure about the text "The augmentation defined
> in this document requires support..."; isn't it obvious that one
> needs to support the model one is augmenting...
>
> - Section 4, please add this text in the description inside the
> YANG module - "This YANG module is maintained by IANA and
> reflects the 'IGP MSD-Types'
> registry."
>
> - identity msd-erld, should also have a reference to RFC9088.
>
> - In "ietf-mpls-msd", please remove the reference "RFC XXXX: A
> YANG Data Model for MPLS MSD." immediately after the module
> description. The revision statement is the correct place to have
> this reference.
>
> - leaf msd-value should also include text for "0 represents the
> lack of ability to support a SID stack of any depth".
>
> - I can not parse "A type of Node MSD is the smallest same type
> link MSD supported by the node.";"
>
> - RFC8340 should be normatively referenced.
>
> ### Nits:
>
> - s/(MSD) Types as the IANA the IGP MSD-Types registry/(MSD)
> Types as per the IANA IGP MSD-Types registry/
>
> - s/which itself augments [RFC8349]/which itself augments routing
> RIB data model [RFC8349]/
>
> - s/IANA maintained module/IANA-maintained module/
>
> - s/This module will be maintained by IANA if more MSD types are
> added to the registry./This module will be maintained by IANA and
> updated if and when there is any change in the registry./
>
> - s/and it is to provide support of different types of MSDs in
> MPLS data plane./and it provides support for different types of
> MSDs in the MPLS data plane./
>
> - s/read-only data decided by/read-only data as per/
>
> - Section 4, expand SID on first use in the YANG model.
>
> Thanks,
> Dhruv
>
>

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