Re: [Teas] WG Adoption Poll - draft-wd-teas-ietf-network-slice-nbi-yang-04

"Ogaki, Kenichi" <ke-oogaki@kddi.com> Thu, 02 September 2021 08:10 UTC

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From: "Ogaki, Kenichi" <ke-oogaki@kddi.com>
To: Daniele Ceccarelli <daniele.ceccarelli=40ericsson.com@dmarc.ietf.org>, Vishnu Pavan Beeram <vishnupavan@gmail.com>, TEAS WG <teas@ietf.org>
CC: TEAS WG Chairs <teas-chairs@ietf.org>
Thread-Topic: [Teas] WG Adoption Poll - draft-wd-teas-ietf-network-slice-nbi-yang-04
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Date: Thu, 2 Sep 2021 07:59:55 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/teas/S_5iARMRyPb0EWFu-duDN2-ekMo>
Subject: Re: [Teas] WG Adoption Poll - draft-wd-teas-ietf-network-slice-nbi-yang-04
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Hi All,

No/not support.

We basically agree with Daniele's opinion.

As we commented to "[Teas] New Version Notification for draft-wd-teas-ietf-network-slice-nbi-yang-03.txt" thread, we totally agree that the slice nbi should be underlying technology agnostic.
However, why don't we discuss to enhance/augment an existing nbi as the nbi solution?

Adrian commented to "[Teas] WG Adoption Poll - draft-king-teas-applicability-actn-slicing-10" thread.
>All the text you quoted says is, “You can use ACTN to achieve network slicing in networks that support ACTN.

If so, does TEAS WG use ACTN to achieve network slicing in networks that support ACTN?
We understand that WG draft adoption poll of "draft-king-teas-applicability-actn-slicing" is dealt in the scope of ietf network slice standardization. The result shouldn't be that it's up to you.


Anyway, the followings are our concerns.

1) According to Figure 1 of draft-king-teas-applicability-actn-slicing-10, NSC NBI can be replaced with CMI. If the new nbi is created, we have to parallelly implement two nbis or just wrap CMI with NSC NBI. From one of mobile operators' capex perspective, we don't want to do such effort, since we believe major ietf network slice requirements can be covered by ACTN.

2) As we discussed in "[Teas] New Version Notification for draft-wd-teas-ietf-network-slice-nbi-yang-03.txt" thread, ns-endpoint must be technology specific. The current model definition of draft-wd-teas-ietf-network-slice-nbi-yang-03 isn't enough, and we believe that the same approach with te-service-mapping for L1/2/3 AC is necessary to do so.

>> >(2) It is true that the data nodes that characterize the slice
>> service within the slice provider are technology-agnostic, but aren't 
>> for the CE-PE attachment as this conditions how the service is 
>> delivered.
>> 
>> We totally agree with you. Inside a slice, technology should be 
>> agnostic, but the demarcation point inside/outside the slice cannot 
>> avoid being technology specific.
>
>[Med] Glad to see we are in agreement.

3) draft-ietf-teas-ietf-network-slices-04 introduced the requirement of connectivity matrix. Similarly, p2p based ns-connections model definition of draft-wd-teas-ietf-network-slice-nbi-yang-04 isn't enough, and we believe that the same approach for connectivity matrix in ACTN is necessary.

4) Although not defined in draft-ietf-teas-ietf-network-slices-04, as we commented in "[Teas] New Version Notification for draft-wd-teas-ietf-network-slice-nbi-yang-03.txt" and "[Teas] New revision: draft-ietf-teas-ietf-network-slices-03.txt" threads, we believe a feasibility check functionality should be defined from the other SDO's requirement, especially for 3GPP slice. This should be the same functionality as VN-compute in actn-vn-yang.


To solve above 2) - 4) requirements, we must create a copy of actn-vn-yang just with different data node names.
If so, again, why don't we enhance/augment actn-vn-yang?



In terms of Tarek's following comment in "[Teas] WG Adoption Poll - draft-king-teas-applicability-actn-slicing-10" thread, 
>However, today other standalone service models such as L3SM and L2SM exist independent of ACTN or VN models.
>
>In fact, the VN draft < draft-ietf-teas-actn-vn-yang>, explicitly mentions that the VN model can co-exist with such service models (see below).

The requirements to L2/3SM model and actn-vn-yang are totally different. Not just parallelly coexisting, but depending on each other as Daniele wrote.


All the best,
Kenichi


-----Original Message-----
From: Teas <teas-bounces@ietf.org> On Behalf Of Daniele Ceccarelli
Sent: Tuesday, August 31, 2021 10:16 PM
To: Vishnu Pavan Beeram <vishnupavan@gmail.com>om>; TEAS WG <teas@ietf.org>
Cc: TEAS WG Chairs <teas-chairs@ietf.org>
Subject: Re: [Teas] WG Adoption Poll - draft-wd-teas-ietf-network-slice-nbi-yang-04

Hi Pavan, WG,

 

”no/do not support”. 

 

We’re polling at the same time two drafts, one of which says how to use ACTN for network slicing and the other explaining why ACTN is not used for the network slicing NBI.

In my opinion this is a conflict that should be resolved before adoption.

 

BR
Daniele  

 

 

 

From: Teas <teas-bounces@ietf.org> On Behalf Of Vishnu Pavan Beeram
Sent: den 27 augusti 2021 17:07
To: TEAS WG <teas@ietf.org>
Cc: TEAS WG Chairs <teas-chairs@ietf.org>
Subject: [Teas] WG Adoption Poll - draft-wd-teas-ietf-network-slice-nbi-yang-04

 

All,

This is start of a *two* week poll on making
draft-wd-teas-ietf-network-slice-nbi-yang-04 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 September 10th.

Thank you,
Pavan and Lou