Re: [Teas] Network slicing framework : Issue #7: Workflow

["Ogaki, Kenichi" <[e-mail]>]

Hi Adrian and Med,

As I wrote below before, a feasibility check request step may be introduced before the creation request.
A feasibility check has a broad sense, but we can limit the scope to the available resource check to create a slice.
This may be not used by an end user(consumer), but a Customer higher level operations system* may require to avoid the creation failure or suspended state.
It corresponds to VN compute of Sec. 4.3.1 of actn-vn-yang model.

https://mailarchive.ietf.org/arch/msg/teas/WZKp2PHrPqH5J5_km8Mz8P2pSVU/

*Figure 1 in draft-ietf-teas-ietf-network-slices-04

Thanks,
Kenichi

-----Original Message-----
From: Teas <[e-mail]> On Behalf Of [e-mail]
Sent: Thursday, September 30, 2021 12:45 AM
To: [e-mail]; [e-mail]
Subject: Re: [Teas] Network slicing framework : Issue #7: Workflow

Hi Adrian, 

> For that reason, I think it would be wrong to document a workflow. 
> (This is a change to my original opinion!)
> 
> Maybe add a sentence to explain that the order that the architectural 
> networks are constructed is open for operational choice.

Seems reasonable. Internals to the NSC should be kep as such (especially, the second and third bullets of your list). 

Another approach would be to focus only on the visible external behavior, e.g.,: 

- The network exposes its (slice) capabilities
- The customer requests a slice
- The NSC maps the requests to the capabilities while applies provider policies (if any) and then creates the resource partition
- The NSC reports back to the customer as a function of the previous step

Cheers,
Med

> -----Message d'origine-----
> De : Teas <[e-mail]> De la part de Adrian Farrel Envoyé : 
> lundi 27 septembre 2021 20:25 À : [e-mail] Objet : [Teas] Network 
> slicing framework : Issue #7: Workflow
> 
> Dependent slightly on the resolution of issue #6 (architecture and 
> terminology), we could document a workflow.
> 
> For example,:
> - customer requests a slice
> - NSC maps slice to a slice group
> - NSC maps slice group to a resource partition
> - NSC allocates resources to the resource partition
> 
> But it seems to me that these steps could happen in pretty much any 
> order depending to operational preferences and possibly the technology 
> of the network.
> 
> For that reason, I think it would be wrong to document a workflow. 
> (This is a change to my original opinion!)
> 
> Maybe add a sentence to explain that the order that the architectural 
> networks are constructed is open for operational choice.
> 
> Cheers,
> Adrian
> 
> _______________________________________________
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> [e-mail]
> https://www.ietf.org/mailman/listinfo/teas

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