[Teas] Re: Éric Vyncke's Discuss on draft-ietf-teas-yang-te-41: (with DISCUSS and COMMENT)

[Adrian Farrel <[e-mail]>]

Thanks Eric. You made the document better.

 

A

On 30/03/2026 12:36 CEST Eric Vyncke (evyncke) <evyncke=[e-mail]> wrote:

 

 

Pavan,

 

As you may have seen by now, I have updated my ballot to a non-blocking No Objection.

 

Thanks for the discussions (facilitated by Adrian)

 

Regards

 

-éric

 

 

 

From: Vishnu Pavan Beeram <[e-mail]>
Date: Saturday, 28 March 2026 at 01:03
To: Eric Vyncke (evyncke) <[e-mail]>
Cc: Tarek Saad <[e-mail]>, The IESG <[e-mail]>, [e-mail] <[e-mail]>, [e-mail] <[e-mail]>, [e-mail] <[e-mail]>, [e-mail] <[e-mail]>
Subject: Re: Éric Vyncke's Discuss on draft-ietf-teas-yang-te-41: (with DISCUSS and COMMENT)

Eric,

Ver. 44 (https://datatracker.ietf.org/doc/draft-ietf-teas-yang-te/44/" rel="nofollow">https://datatracker.ietf.org/doc/draft-ietf-teas-yang-te/44/) includes all the updates that were discussed on and off-list. Please review the changes and let us know if anything is amiss.

Regards,
-Pavan

 

On Tue, Mar 17, 2026 at 8:18 AM Eric Vyncke (evyncke) <[e-mail]> wrote:

Pavan,

 

This would indeed address my concern.

 

-éric

 

From: Vishnu Pavan Beeram <[e-mail]>
Date: Tuesday, 17 March 2026 at 23:05
To: Eric Vyncke (evyncke) <[e-mail]>
Cc: Tarek Saad <[e-mail]>, The IESG <[e-mail]>, [e-mail] <[e-mail]>, [e-mail] <[e-mail]>, [e-mail] <[e-mail]>, [e-mail] <[e-mail]>
Subject: Re: Éric Vyncke's Discuss on draft-ietf-teas-yang-te-41: (with DISCUSS and COMMENT)

Eric,

 

Regarding your comment on extended-tunnel-id, please refer to Tarek's response sent on Feb 14th (reproduced below). We will change the leaf type to tetypes:te-node-id, and that will ensure that an IPv6 address can be used as the extended-tunnel-id. This change, when made, should address your concern.

**
[TS]: RFC3209 defined this as 4 or 16 byte identifiers (depending on session object type IPv4/IPv6). We will update this leaf as follows:

leaf extended-tunnel-id {
  type te-types:te-node-id;
  description
    "A qualifier used to ensure the global uniqueness of the
     tunnel identifier. It carries a 4-byte or 16-byte value,
     typically corresponding to the Extended Tunnel ID extracted
     from the RSVP-TE SESSION object as defined in RFC 3209.";
  reference
    "RFC3209";
}

For reference, the te-node-id is already defined as:

typedef te-node-id {
   type union {
     type yang:dotted-quad;
     type inet:ipv6-address-no-zone;
   }

}
**

 

Regards,

-Pavan

 

On Tue, Mar 17, 2026 at 12:11 AM Eric Vyncke (evyncke) <[e-mail]> wrote:

Tarek and authors,

 

Thanks for the -43 as it addresses some DISCUSS points but also introduces a new one :-)

 

• Appendix A.1 is fixed indeed
• extended-tunnel-id the description is fixed *BUT* the YANG type is dotted-quad which can only represent 32-bit quantity

 

About the remaining DISCUSS, the abstract still contains `The model covers data that is independent of any technology or dataplane encapsulation` which contradicts the title, which is indeed specific to LSP-based.

 

Section 3 is better with the removal of 'generic' but it still has `This document describes a TE data model that is independent of any dataplane technology.`  while being heavy on the LSP side. 

 

I.e., there are 2 remaining DISCUSS points that are mainly editorial though.

 

Regards

 

-éric

 

 

 

From: Tarek Saad <[e-mail]>
Date: Sunday, 15 February 2026 at 12:03
To: Eric Vyncke (evyncke) <[e-mail]>, The IESG <[e-mail]>
Cc: [e-mail] <[e-mail]>, [e-mail] <[e-mail]>, [e-mail] <[e-mail]>, [e-mail] <[e-mail]>
Subject: Re: Éric Vyncke's Discuss on draft-ietf-teas-yang-te-41: (with DISCUSS and COMMENT)

Hi Eric,

 

Thank you for your review and comments. Please see inline for responses. I'm also adding a pointer to the work-in-progress https://author-tools.ietf.org/diff?url_1=https://raw.githubusercontent.com/tsaad-dev/drafts/master/te/draft-ietf-teas-yang-te.txt&url_2=https://www.ietf.org/archive/id/draft-ietf-teas-yang-te-41.txt" target="_blank" rel="noopener nofollow"> diffs.

 

From: Éric Vyncke via Datatracker <[e-mail]>
Date: Wednesday, February 4, 2026 at 3:47 AM
To: The IESG <[e-mail]>
Cc: [e-mail] <[e-mail]>, [e-mail] <[e-mail]>, [e-mail] <[e-mail]>, [e-mail] <[e-mail]>
Subject: Éric Vyncke's Discuss on draft-ietf-teas-yang-te-41: (with DISCUSS and COMMENT)

Éric Vyncke has entered the following ballot position for
draft-ietf-teas-yang-te-41: Discuss

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The document, along with other ballot positions, can be found here:
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----------------------------------------------------------------------
DISCUSS:
----------------------------------------------------------------------


# Éric Vyncke INT AD comments for draft-ietf-teas-yang-te-41
CC @evyncke

Thank you for the work put into this document.

Please find below some blocking DISCUSS points (easy to address), some
non-blocking COMMENT points/nits (replies would be appreciated even if only for
my own education).

Special thanks to Adrian Farrel for the shepherd's *very detailed* write-up
including the WG consensus, the lack of implementation status, but it *lacks*
the justification of the intended status.

I hope that this review helps to improve the document,

Regards,

-éric

Note: this ballot comments follow the Markdown syntax of
https://github.com/mnot/ietf-comments/tree/main" target="_blank" rel="noopener nofollow">https://github.com/mnot/ietf-comments/tree/main, i.e., they can be processed by
a tool to create github issues.

## DISCUSS (blocking)

As noted in
https://datatracker.ietf.org/doc/statement-iesg-handling-ballot-positions-20220121/" target="_blank" rel="noopener nofollow">https://datatracker.ietf.org/doc/statement-iesg-handling-ballot-positions-20220121/,
a DISCUSS ballot is a request to have a discussion on the points below; I
really think that the document would be improved with a change here, but can be
convinced otherwise.

### Misleading title & abstract

The abstract contains `The model covers data that is independent of any
technology or dataplane encapsulation` (i.e., not linked to a technology) but
the whole model is about LSP (i.e., linked to specific technologies). The TEAS
charter is explicitly not limited to MPLS/GPLS as it includes `TE is applied to
packet networks via MPLS TE tunnels and LSPs, but may also be provided by other
mechanisms such as forwarding rules similar to policy-based routing.`

Suggest using 'A YANG data model for LSP-based point-to-point TE and the
associated interfaces'

[TS]: we feel the current title "A YANG Data Model for Traffic Engineering Tunnels, Label Switched Paths, and Interfaces" covers LSP based tunnels. To ensure we're in sync with the WG, a new discussion thread will be started on the WG mailing list on proposed new terminology.


### Section 3

Same as above as the text includes `The elements of the generic TE YANG data
model` while it forces the use of LSP.

I won't comment anymore about this model being LSP-only (e.g., leaves
source/destination are about `LSP endpoint`).

### Section 5.3 and extended-tunnel-id

If `extended-tunnel-id` is just a 32-bit ID (such as OSPFv3 router ID) printed
in quad decimal, then do not use IPv4 in the description (currently `by
carrying an IPv4 address of the LSP head end`).

If it is actually an IPv4 address, then this I-D should not be published in
2026 as it does not support IPv6.

[TS]: RFC3209 defined this as 4 or 16 byte identifiers (depending on session object type IPv4/IPv6). We will update this leaf as follows:

 

        leaf extended-tunnel-id {

          type te-types:te-node-id;

          description

          description

        "A qualifier used to ensure the global uniqueness of the

         tunnel identifier. It carries a 4-byte or 16-byte value,

         typically corresponding to the Extended Tunnel ID extracted

         from the RSVP-TE SESSION object as defined in RFC 3209.";

          reference

            "RFC3209";

        }

 

For reference, the te-node-id is already defined as:

 

  typedef te-node-id {

    type union {

      type yang:dotted-quad;

      type inet:ipv6-address-no-zone;

    }



### Appendix A.1

Even if the examples in appendixes are usually non-normative, they should be
easy to understand and the tunnel `Example_LSP_Tunnel_A_2 (IPv6)` appears to be
anchored on 2 IPv6 addresses (thank you) but these addresses do not appear on
the figure 10.

[TS]: The figure is updated with addresses.

----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------


## COMMENTS (non-blocking)

### Med Boucadair's DISCUSS

I second Med's DISCUSS about the lack of justification about the single choice
of anchoring a tunnel on a single interface (as opposed to a node or multiple
interfaces).

[TS]: we will respond to Med's comment and keep you posted.

### Use of SVG graphics

To make a much nicer HTML rendering, suggest using the aasvg tool to generate
SVG graphics. It is worth a try especially if the I-D uses the Kramdown file
format ;-)

### Section 5

Please expand SRLG at first use.

 

[TS]: done.

### Section 5.1.2

I wonder whether the TEAS WG considered adding other properties for the
tunnels, e.g., MTU, whether to copy the hop-limit/TTL to the outside header, ...

Why is it `LSP head-end` for leaf source and `LSP endpoint` for leaf
destination ?

 

[TS]: the 'LSP endpoint'​ is used now in both cases - e.g.:

 

NEW:

leaf source {

  type te-types:te-node-id;

  description

    "The address of the ingress LSP endpoint that identifies the 

     start of the tunnel. This typically corresponds to the 

     Tunnel Sender Address extracted from the RSVP-TE 

     SENDER_TEMPLATE object.";

Please run a spell check on the module itself (e.g., s/identfies/ident*i*fies/)

[TS]: done.

 

Regards,

Tarek (for the authors)

 

### Appendix A

Having IPv4-only examples in 2026 does not sound too good...

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