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Dear Christer,

Many thanks for the review. We have addressed all your comments as followin=
g:

https://author-tools.ietf.org/iddiff?url2=3Ddraft-ietf-netconf-yang-notific=
ations-versioning-17

See inline below answers to your clarification questions.

Best wishes
Thomas

-----Original Message-----
From: Christer Holmberg via Datatracker <noreply@ietf.org>
Sent: Monday, September 21, 2026 7:50 PM
To: gen-art@ietf.org
Cc: draft-ietf-netconf-yang-notifications-versioning.all@ietf.org; last-cal=
l@ietf.org; netconf@ietf.org
Subject: draft-ietf-netconf-yang-notifications-versioning-16 ietf last call=
 Genart review


Be aware: This is an external email.


Document: draft-ietf-netconf-yang-notifications-versioning
Title: Support of Versioning in YANG Notifications Subscription
Reviewer: Christer Holmberg
Review result: Ready with Issues

I am the assigned Gen-ART reviewer for this draft. The General Area Review =
Team (Gen-ART) reviews all IETF documents being processed by the IESG for t=
he IETF Chair.  Please treat these comments just like any other last call c=
omments.

For more information, please see the FAQ at

<https://wiki.ietf.org/en/group/gen/GenArtFAQ>.

Document: draft-ietf-netconf-yang-notifications-versioning-16
Reviewer: Christer Holmberg
Review Date: 2026-09-21
IETF LC End Date: 2026-09-29
IESG Telechat date: Not scheduled for a telechat

Summary: The document is easy to read, but I do have some issues (technical=
 and
editorial) that I'd like the authors to address. Some of them may be becaus=
e I am not a YANG expert :)

Major issues:

N/A

Minor issues:

GENERAL:
=3D=3D=3D=3D=3D=3D=3D

Q1:

In the text, it is unclear whether a change in the semantic version necessa=
rily requires a change in the revision date.

For example, the text in Section 2 says:

"The YANG-Push Publisher MUST send a subscription-terminated notification i=
f the 'revision' or 'version' of the YANG module name in the Subscription p=
olicy configuration no longer matches with the YANG library..."

The use of "or" indicates that a mismatch in either the revision or the ver=
sion is sufficient to terminate the subscription. However, it is unclear wh=
ether the semantic version may change while the revision date remains uncha=
nged, or whether the two values must always change together.

Elsewhere, the text refers to changes in the "revision" AND "version". Plea=
se clarify the relationship between these values and specify which change c=
ombinations are valid.

TG> With https://datatracker.ietf.org/doc/html/rfc7950#section-7.1.9 revisi=
on was introduced which uniquely identifies a YANG module. With https://dat=
atracker.ietf.org/doc/html/draft-ietf-netmod-yang-semver-28#section-4.2 the=
 version statement, not to be confused with revision, is newly introduced f=
or semantic versioning. Allowing the module designer to declare wherever a =
new version is backward compatible or not. Prior, in YANG 1.1 defined RFC 7=
950, all YANG revisions MUST be backward compatible.

----

Q2:

The document uses both "Subscriber" and "Receiver". Is the reason that thes=
e may be separate entities? E.g., that a Subscriber may create a subscripti=
on on behalf of another entity (Receiver) that then receives the notificati=
ons?

If the Subscriber and Receiver are always the SAME entities, would it be po=
ssible to use e.g., only Subscriber? If they can be different entities, per=
haps that should be explicitly clarified.

TG> As described in https://datatracker.ietf.org/doc/html/draft-ietf-netcon=
f-yang-notifications-versioning#section-1.1, the term receiver is coming fr=
om YANG-Push RFC 8639 and is indeed the system component which receives fro=
m the Publisher (that the network node) the Notifications. Where Subscriber=
 is coming from the NMDA datastore concept is the system component configur=
ing the subscription. With dynamic subscription, the subscriber and the rec=
eiver are indeed usually the same system components but different software =
routines. Where on configured subscription, these are two different softwar=
e component (configuration orchestration vs. data collection).

----

Q3:

The text in Section 2 says:

"The YANG-Push Publisher MUST send a subscription-terminated notification i=
f the 'revision' or 'version' of the YANG module name in the Subscription p=
olicy configuration no longer matches with the YANG library [RFC8525] after=
 reboot of the network node."

The text in Section 7 says:

"Since this document proposes YANG version and revision extensions in Subsc=
ription configuration and state change notifications, it is expected that c=
hanges in YANG version and revision of a Subscription during Subscription l=
ifecycle accounts for changes in Subscription policy and therefore MUST tri=
gger 'subscription-modified' Subscription state change Notifications."

If I understand this correctly, the Publisher behavior differs depending on=
 whether the mismatch is detected after a reboot or during the subscription=
 lifecycle? After a reboot subscription-terminated is sent. During the subs=
cription lifecycle a subscription-modified is sent.

If my understanding is correctly, I think it needs to be more clear, e.g., =
by describing the reboot procedure in Section 7.

TG> Good catch. Andy and Saumya already caught this as well and we are disc=
ussing in https://mailarchive.ietf.org/arch/msg/netconf/U12FZi3-kfkuuBLe7zI=
JTABd8wE/.  We ended up by removing "after reboot of the network node" to b=
e compliant with https://datatracker.ietf.org/doc/html/rfc8639#section-2.5.=
1

----

SECTION 1:
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Q5:

The text in Section 1 says:

"Hence, when a network node is upgraded, the subscribed YANG module revisio=
n may have changed, and might consequently break the data processing pipeli=
ne since the YANG-Push Receiver may not be aware of this change."

Is there a reason why the semantic version is not mentioned here? If a sema=
ntic version can change independently of the revision date, the text should=
 include both values. If a semantic-version change always implies a revisio=
n-date change, this should be clearly defined.

TG> Good catch. Version has been added as well.

----

SECTION 2:
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

Q6:

The text in Section 2 says:

"revision: Restricts the Subscription to a specific YANG module revision.
Example: '2014-05-08'."

"version: Restricts the Subscription to the latest compatible YANG module s=
emantic version referenced to. Example: '2.0.0'."

The meaning of "latest compatible" is unclear. In the example, does 2.0.0 m=
ean that the Subscription is restricted to exactly version 2.0.0 or that an=
y version compatible with 2.0.0 is allowed?

TG> Thats refering to semantic versioning defined in https://datatracker.ie=
tf.org/doc/html/draft-ietf-netconf-yang-notifications-versioning

----

Nits/editorial comments:

GENERAL:
=3D=3D=3D=3D=3D=3D=3D=3D

Q4:

The document uses inconsistent terminology, e.g.,: "YANG version"; "YANG mo=
dule version"; and "YANG module semantic version".

TG> Good catch. Two occasions "YANG version" should have been "YANG module =
version". Corrected. "YANG version" would mean the YANG language version wh=
ich is clearly not the object here.

The same applies to "revision" and "revision date".

TG> the term revision is used throughout the document. However the YANG nod=
e identifying revision is called revision and its typedef is revision-date,=
 which is imported from ietf-yang-revisions.yang (draft-ietf-netmod-yang-mo=
dule-versioning) to reflect that revision is in the date format as specifie=
d in https://datatracker.ietf.org/doc/html/rfc7950#section-7.1.9.

Please use consistent terminology.

For example, the text in Section 1 says:

"a subscriber cannot constrain the supported YANG module revision or versio=
n and is not notified when the YANG module revision or version associated w=
ith the YANG-Push Subscription changes"

Perhaps this could be changed to:

"a Subscriber cannot constrain the supported YANG module revision date or s=
emantic version and is not notified when the YANG module revision date or s=
emantic version associated with the YANG-Push Subscription changes"


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