Hi Linda，
Thank you for your feedback to me.
I also agree with Neotec's API framework of opening up the YANG model to the
cloud through API. IETF has defined many YANG models, but the fact is
that the proportion in practical applications is not high. The idea of opening
up the YANG model to the cloud through API may be an effective way to improve
its usage，it also meets the cloud and network collaboration needs of our
operators.
I also agree with Chongfeng's suggestion that "Clous Service ID" should be
introduced, this will make the role of policy more focused. I also have
one suggestion, in figure 8, "source-sites" and "dest-sites" may be too coarse
to identify a service instance, so I propose to add an attribute of
"Cloud Service ID" in this policy, based on this ID, the policies for specific
service traffic can be issued to the network controller, and traffic that
crosses different paths can also be easily associated based on this ID.
Best regards,
Wei
原始邮件
发件人：Linda Dunbar <dunbar...@gmail.com>
发件时间：2025年4月22日 00:48
收件人：Wei Wang <weiwan...@foxmail.com>
抄送：Linda Dunbar <linda.dun...@futurewei.com>, neo...@ietf.org
<neo...@ietf.org>, opsawg <opsawg@ietf.org>, mohamed.boucad...@orange.com
<mohamed.boucad...@orange.com>, Joel Halpern Direct
<jmh.dir...@joelhalpern.com>, Mahesh Jethanandani
<mjethanand...@gmail.com>
主题：[neotec] Re: [OPSAWG]Feedback Wanted: Is Attachment Circuit YANG Sufficient
for Neotec Use Case?
Wei,
Thank you very much for the review and a very good question.
Please see below for the detailed answer:
On Fri, Apr 18, 2025 at 5:48 PM Wei Wang <weiwan...@foxmail.com> wrote:
HI Linda,
The case in this draft is very typical in the illustration of network operation
for telecom cloud, thank for your effort. I have one question regarding the
model: What if the network between the access point and edge cloud data center
is typical Internet network, which is not TE based, what model can be used?
[Linda] That is a very good question. By the way, we have updated
the draft with SRv6 and TE underlay added:
https://datatracker.ietf.org/doc/draft-dunbar-neotec-ac-te-applicability/
To address your question, we might need to add some study of Non-TE-Based or
Internet-Backed PE-PE Networks:
In Non-TE-Based or Internet-Backed PE-PE Networks, basic connectivity and
performance data may still be obtained using existing IETF YANG models such as:
- RFC 8343 (YANG Data Model for Interface Management) and RFC 8344
( YANG Data Model for IP Management) for interface and IP layer status
- ietf-routing [RFC8349] to understand basic forwarding paths and
route preferences
- Operational telemetry models for real-time monitoring of metrics like:
* Interface utilization
* Packet loss
* Round-trip time (RTT)
* Jitter (if measured using active probes or synthetic monitoring)
In these cases, instead of path-level traffic engineering, the
orchestrator or Cloud Manager can query and interpret per-hop or
per-segment interface metrics, or use active measurements (e.g., IP SLA-like
probes) to estimate end-to-end path characteristics. These inputs can inform
workload placement decisions, albeit without the
deterministic path selection and enforcement that TE-based architectures allow.
Neotec’s API framework can abstract these differences by returning
consistent metrics (e.g., latency, bandwidth availability), regardless
of whether they are derived from TE topology models or measured
heuristically in best-effort environments.
Linda
Thanks
Wei
---Original---
From: "Linda Dunbar"<linda.dun...@futurewei.com>
Date: Fri, Apr 18, 2025 10:32 AM
To: "neo...@ietf.org"<neo...@ietf.org>;"'opsawg'"<opsawg@ietf.org>;"mohamed.boucad...@orange.com"<mohamed.boucad...@orange.com>;
Cc: "Joel Halpern Direct"<jmh.dir...@joelhalpern.com>;"Mahesh
Jethanandani"<mjethanand...@gmail.com>;
Subject: [OPSAWG]Feedback Wanted: Is Attachment Circuit YANG Sufficient
for Neotec Use Case?
Med,
Following your suggestion during IETF 122 for us to take a simple Neotec use
case and "do our homework" by applying existing IETF YANG models—specifically
the Attachment Circuit model— we’ve completed an initial exercise and
documented it in the following draft:
"Applicability of Attachment Circuit and TE YANG Models to a Neotec Use Case"
https://datatracker.ietf.org/doc/draft-dunbar-neotec-ac-te-applicability/
Our goal with this draft is to evaluate whether the AC and TE YANG models are
sufficient to support the selected use case, and to identify any potential
modeling or architectural gaps. This is intended as an exploratory step to
evaluate whether there is substantive, standards-relevant work that could
justify a Neotec WG.
We would greatly appreciate your feedback: Does this exercise align with what
you envisioned? Are we on the right track? Any guidance or suggestions on how
to refine the framing would be greatly appreciated.
Cc'ing the opsawg mailing list here in case others would like to help us
evaluate the approach and share perspectives on the usefulness of this line of
inquiry.
Best regards,
Linda
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