[Idr] Re: BGP-SR: Shepherd's review for draft-ietf-idr-sr-policy-path-mtu-12

Cheng Li <c.l@huawei.com> Mon, 01 December 2025 08:07 UTC

From: Cheng Li <c.l@huawei.com>
To: Susan Hares <shares@ndzh.com>, idr <idr@ietf.org>
Thread-Topic: [Idr] BGP-SR: Shepherd's review for draft-ietf-idr-sr-policy-path-mtu-12
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Subject: [Idr] Re: BGP-SR: Shepherd's review for draft-ietf-idr-sr-policy-path-mtu-12
Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/2UIyELPG8NTI2Pb6QxCF-pbGUPk>

Hello Sue

Thank you for your help!

Based on Shepherd Review on -12, we have made the following modifications in -13 revision:


(1)    Technical issues from -10 has been resolved, specifically:
"Issue-4:  Missing Manageability section

Please add an section to indicate how operators may manage set or monitor
the PATH MTU via existing Yang modules or BGP-LS support.

If these do not exist, suggest whether a yang module or BGP-LS support would be useful."

We have added a section of Manageability Considerations:
"Currently, there is no standardized YANG data model that explicitly exposes the Path MTU value carried in the BGP SR Policy Path MTU Sub-TLV to network management systems or operators. Similarly, while BGP-LS can distribute link-level MTU information (as defined in [I-D.ietf-idr-bgp-ls-link-mtu]), it does not natively convey end-to-end Path MTU values associated with specific SR Policies.

Standardized manageability support would significantly improve operational visibility and automation. Therefore, the authors recommend a YANG Module Extension: Extend the YANG data model for SR Policies (e.g., ietf-sr-policy or vendor-specific models) to include a read-only leaf for path-mtu, reflecting the value received via BGP or configured locally. This would enable NETCONF/RESTCONF-based retrieval and integration with network assurance systems."


Other issues from -10 have already been solved in the past revisions.

(2)  the name of the IANA registry has been modified as "SR Policy Segment List Sub-TLVs"

Yours,
Cheng and Guanming

From: Susan Hares <shares@ndzh.com>
Sent: Monday, November 3, 2025 9:45 AM
To: idr <idr@ietf.org>
Subject: [Idr] BGP-SR: Shepherd's review for draft-ietf-idr-sr-policy-path-mtu-12


Draft Summary
draft:  [draft-ietf-idr-sr-policy-path-mtu](/group/idr/implementations/draft-ietf-idr-sr-policy-path-mtu)
Type: Proposed Standard
status: WG Draft, needs revision 13 prior to early allocation
adopted: [9/1/2024](https://mailarchive.ietf.org/arch/msg/idr/xUckKQncQ4rLVCCAkBO6bQ6zcuk/) (8/1 to 8/30 call)
current version: -12
Early Allocation: yes, needs -13 revision
implementations: 1 (Huawei in VRP)
related bgp-ls draft:  none

Shepherd Review on -12
**Summary:** Technical issues from -10 are not resolved in -12. Also, the name of the
IANA registry is: SR Policy Segment List Sub-TLVs.  Please make these correction in -13.

Next steps:
1. Publish -13 with corrections
2. Get shepherd's review of -13
3. If -13 is ok, then do 2 week Early Allocation call

Sue Hares

[Idr] BGP-SR: Shepherd's review for draft-ietf-id… Susan Hares
[Idr] Re: BGP-SR: Shepherd's review for draft-iet… Cheng Li