Hi Yingzhen,

Thanks for the follow-up.

Please see inline.

Cheers,
Med

De : Yingzhen Qu <[email protected]>
Envoyé : dimanche 14 juillet 2024 06:09
À : BOUCADAIR Mohamed INNOV/NET <[email protected]>
Cc : [email protected]; [email protected]; [email protected]; 
[email protected]
Objet : Re: Mail regarding draft-ietf-tvr-schedule-yang

Hi Med,

Thanks for the review and comments.


  *   There is a disconnect between the types used in existing 
topology/interface models and the TVR one.
Do you mean the model is not augmenting existing models? If so, that's done on 
purpose so we don't create dependencies to existing models.

[Med] No, I meant that the type of some data nodes are not matching the types 
used for similar nodes in existing models: e.g., if/name is a union in your 
case while this is a string in 8343, your node-id is yang:dotted-quad in 
ietf-tvr-node while it is a uri in 8345 (but you have it right in 
ietf-tvr-topology), source-link-id is a string while this is a uri in 8345. 
Some text to explain the rationale why you deviate from those is missing, IMO. 
Also, the change of the type between modules in the same document raises the 
question of correlation between these modules (e.g., node-id).


  *   Are there cases where the same schedule will be used by multiple 
interfaces/nodes? If so, consider factorizing and only have a reference to that 
same schedule rather that defining it for each interface/node.
Are you suggesting for example we define a list of schedules with IDs, then 
under each interface/node use the IDs to reference the schedules? It's possible 
there might be multiple interfaces using the same schedule, however the 
attributes such as bandwidth may not be the same.

[Med] Profiling does not prevent overriding a value when needed.

The current design is simpler.

[Med] It is simpler but may not be optimal for storing and manipulating large 
topology files. I’m not pushing for any direction here but simply checking if 
you considered these aspects. You may refer to 
https://mailarchive.ietf.org/arch/msg/opsawg/uqvSkt5w-spTkRJ0f-DzUDTwT0c/ for 
an example where such considerations are problematic when not adequately 
handled in the design. If you are confident that all is well set in your design 
and that such issues are not applicable in your case, please say so in the 
draft. Thanks.

Other editorial suggestions I will fix in the next version of the draft after 
the datatracker opens.

Thanks,
Yingzhen

On Fri, Jul 12, 2024 at 3:00 AM 
<[email protected]<mailto:[email protected]>> wrote:
Hi Authors, all,

As part of our effort to check that the NETMOD Common Schedule module 
(draft-ietf-netmod-schedule-yang) common basis set for target uses, I reviewed 
all the I-Ds that use draft-ietf-netmod-schedule-yang. The review also focuses 
on whether the grouping are used as intended and if some of the existing 
groupings makes sense for a specific context.

Great to see that the new revision uses the utc grouping that we created as an 
outcome of the IETF#119 TVR discussion.

I didn’t flagged any major issue related to the use of the common structures. 
The narrative text should be updated to redirect the readers to the common spec 
for more details about the period/recurrence data nodes. That’s an easy to fix 
thing.

One open question though, is whether you considered to graft the state grouping 
to the TVR modules (e.g. track failure of triggered actions, invocation 
counters, etc.).

The review below includes a more detailed list of open questions, but I’m 
providing here main ones:

  *   There is a disconnect between the types used in existing 
topology/interface models and the TVR one.
  *   Are there cases where the same schedule will be used by multiple 
interfaces/nodes? If so, consider factorizing and only have a reference to that 
same schedule rather that defining it for each interface/node.


FWIW, my detailed review of draft-ietf-tvr-schedule-yang can be found at:


  *   pdf: 
https://github.com/boucadair/IETF-Drafts-Reviews/blob/master/2024/draft-ietf-tvr-schedule-yang-01-rev%20Med.pdf
  *   doc: 
https://github.com/boucadair/IETF-Drafts-Reviews/raw/master/2024/draft-ietf-tvr-schedule-yang-01-rev%20Med.doc

Cheers,
Med

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