Re: [OPSAWG] Yangdoctors last call review of draft-ietf-opsawg-l2nm-07

[[e-mail]]

Hi Lada, 

Many thanks for the careful review.

Please see inline. 

Cheers,
Med

> -----Message d'origine-----
> De : Ladislav Lhotka via Datatracker <[e-mail]>
> Envoyé : mardi 5 octobre 2021 10:04
> À : [e-mail]
> Cc : [e-mail]; [e-mail];
> [e-mail]
> Objet : Yangdoctors last call review of draft-ietf-opsawg-l2nm-07
> 
> Reviewer: Ladislav Lhotka
> Review result: Ready with Issues
> 
> **** General comments
> 
> The ietf-l2vpn-ntw module with about 400 data nodes represents an
> impressive amount of work. Its size, however, raises some concerns in
> terms of manageability. For example, if the ITU-T Y-1731 recommendation
> ever gets updated (I don't know how likely this is), the module will have
> to be updated.
> I would therefore suggest to consider factoring out such parts into
> separate modules.

[Med] We have already made an effort to factorize many items in:
* I-D.ietf-vpn-common
* two separate IANA-maintained modules

One candidate "externalization" that I think would work to address your concern is to move ethernet-segments (and esi types) into a separate module. 

I have a preference to work in that direction vs. touching the OAM part. 

Would that solve your concern? Thank you. 

> 
> Apart from that, the YANG modules are in a good shape.

[Med] Thanks.

> 
> **** Specific comments
> 
> ***** Instance data examples
> 
> The appendices A.1--A.6 contain examples of instance data for six
> different use cases. This would be laudable, but only if the examples were
> valid according to the data model schema. It seems that the examples were
> not updated during the data model development.

[Med] Many thanks for looking into these. Will check and fix as appropriate. 

 It is necessary to validate
> the examples using the available tools such as yanglint or Yangson, and
> correct all errors. Here is a non-exhaustive list of problems in the
> example of appendix A.1: - The top-level container "ietf-l2vpn-ntw:l2vpn-
> ntw" is missing, which complicates the use of validation tools.

[Med] We don't include the top-level as we assumed this will be included in the request URI (RESTCONF).

 - "vpn-
> service" list contains "vpn-description" leaf, not "description".

[Med] ACK

 -
> "global-parameters-profile" list contains "svc-mtu" leaf, not "mtu".

[Med] ACK

 - The
> value of "global-parameters-profile/rd-suffix" should be uint16, not
> string (e.g. 1 rather than "1").

[Med] ACK. This one was already fixed in our local copy as you can see in this commit: https://github.com/IETF-OPSAWG-WG/lxnm/commit/8cd6863c52e956ccd490df1a002d786d6de8628f#diff-17b3d33597c20b9786dd2dbedebdbcdb61e16e366431e0411761467ec8aae248. 

 Similarly, "vpn-target/id" is uint8, not
> string.

[Med] This one was already fixed in -07:

                   "vpn-target": [
                     {
                       "id": 1,


 - Container "vpn-targets" encapsulating "vpn-target" list doesn't
> exist in the schema.

[Med] ACK


 - "vpn-target/route-targets" is defined as a list,
> but its instance value is given as ["0:65550:1"] (it probably used to be a
> leaf-list).

[Med] I confirm. We added the list thing and explained in the vpn-common the reason why we are using a list not a leaf-lsit. 

> - Inside "vpn-service" list, the schema defines "vpn-nodes" container
> encapsulating "vpn-node" list. This container is missing in the example.

[Med] ACK.

> 
> ***** RFC 8792 line folding
> 
> My reading of sec. 7.1.1 in RFC 8792 is that each text chunk that uses the
> single backslash strategy should be preceded with the header
> 
> NOTE: '\' line wrapping per RFC 8792

[Med] Added this header, when appropriate: 

=============== NOTE: '\' line wrapping per RFC 8792 ================

> 
> **** Nits
> 
> - The naming of groupings is inconsistent: "cfm-802-grouping" versus e.g.
> "y-1731". I'd suggest to remove the "-grouping" suffix in the former.
> 

[Med] Fixed in my local copy. 

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