Re: [Teas] WG Adoption poll - draft-nsdt-teas-ns-framework-05

Kiran Makhijani <kiranm@futurewei.com> Thu, 04 February 2021 21:39 UTC

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From: Kiran Makhijani <kiranm@futurewei.com>
To: "Luis M. Contreras" <contreras.ietf@gmail.com>, Vishnu Pavan Beeram <vishnupavan@gmail.com>
CC: TEAS WG Chairs <teas-chairs@ietf.org>, TEAS WG <teas@ietf.org>
Thread-Topic: [Teas] WG Adoption poll - draft-nsdt-teas-ns-framework-05
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Date: Thu, 4 Feb 2021 21:38:59 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/teas/gs3bSOU27QMHVYYA3uUBMa-IVsU>
Subject: Re: [Teas] WG Adoption poll - draft-nsdt-teas-ns-framework-05
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Hi Luis,
Good catch on section 3.2. For now we should consider cases for  network slices under one NSC.  However, we should also be clear that NSC will work with networks in different admin/operator domains using SBI. When this is not possible, higher level orchestrator may request different slices from different NSCs and connect them together.
-Kiran

From: Teas <teas-bounces@ietf.org> on behalf of Luis M. Contreras <contreras.ietf@gmail.com>
Date: Thursday, February 4, 2021 at 11:41
To: Vishnu Pavan Beeram <vishnupavan@gmail.com>
Cc: TEAS WG Chairs <teas-chairs@ietf.org>rg>, TEAS WG <teas@ietf.org>
Subject: Re: [Teas] WG Adoption poll - draft-nsdt-teas-ns-framework-05
Hi all,

Despite the fact that I acknowledge the value of the document, I feel more discussion is needed before adoption. So I don't support the adoption at this stage. Essentially,

Some reasons for that are:

.- The document states in sec. 3.2 that the NSC from one operator could request IETF network slices to the NSC of another operator. This has several implications in the NSC, and as such, should require more discussion. For instance: (1) there could be different levels of trustiness in the relationship among operators tat could imply different levels of abstractions, not necessarily the same as with another kind of customer/user, then open the door to the support of different kind of information to be supported by the NBI; (2) the relationship between operators could come via higher level systems instead, then relaxing / modifying considerations such security, monitoring information, etc; (3) having a direct relationship implies that one of the the SBI implementations of a NSC should the same as the NBI, to support this possibility; (4) there should be a common understanding / definition of the abstractions between operators to express the services; etc

.- The document has a specific section for ACTN (sect. 4). In fact there was some discussion on the list about this, reflecting the fact that several interpretations could be provided for a mapping as the intended in Figure 1, without a single mapping of entities between ACTN and the intended framework. Besides that, a specific document describing the applicability of ACTN to slicing (draft-king-teas-applicability-actn-slicing) is now work-in-progress, making the ACTN text in the framework document redundant with that other document. In my view, sect. 4 is more confusing than clarifying, so I prefer to remove it from the framework document, developing the applicability of ACTN to slicing in that other dedicated document.

.- Section 3.5 described an initial workflow on the realization of IETF Network Slices but it focuses only on provision. Other aspects of the IETF Network SLice lifecycle are missing, and I think it would be important to describe since this framework will become the basis for further specifications of functionality of the IETF NSC. For instance, capability exposure of the NSC (what happens if some SLOs cannot be provided?), fulfillment, assurance, etc, are not included/discussed.

This is not an exhaustive review, this is just to remark the need of more discussion for having clear the perimeter of the document before progressing it into adoption, from my point of view.

Best regards

Luis


El jue, 4 feb 2021 a las 14:43, Vishnu Pavan Beeram (<vishnupavan@gmail.com<mailto:vishnupavan@gmail.com>>) escribió:
All,

This is start of a *two* week poll on making
draft-nsdt-teas-ns-framework-05 a TEAS working group document. Please
send email to the list indicating "yes/support" or "no/do not support".
If indicating no, please state your reservations with the document. If
yes, please also feel free to provide comments you'd like to see
addressed once the document is a WG document.

The poll ends February 18th.

Thank you,
Pavan and Lou
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--
___________________________________________
Luis M. Contreras
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luismiguel.contrerasmurillo@telefonica.com<mailto:luismiguel.contrerasmurillo@telefonica.com>
Global CTIO unit / Telefonica