Re: [Teas] New Version Notification for draft-nsdt-teas-ietf-network-slice-definition-00.txt

mohamed.boucadair@orange.com Thu, 22 October 2020 11:41 UTC

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From: <mohamed.boucadair@orange.com>
To: Kiran Makhijani <kiranm@futurewei.com>, "teas-ns-dt@ietf.org" <teas-ns-dt@ietf.org>, TEAS WG <teas@ietf.org>
Thread-Topic: New Version Notification for draft-nsdt-teas-ietf-network-slice-definition-00.txt
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Date: Thu, 22 Oct 2020 11:41:25 +0000
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Subject: Re: [Teas] New Version Notification for draft-nsdt-teas-ietf-network-slice-definition-00.txt
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Hi Kiran, all, 

Thank you for sharing this updated version. 

(1)

It seems that the scope is still connectivity:

   An IETF Network Slice is a well-defined structure of connectivity
   requirements and associated network behaviors.  IETF Network Slices
   are defined such that they are independent of the underlying
   infrastructure connectivity and technologies used.  This is to allow
   an IETF Network Slice consumer to describe their network connectivity
   and relevant objectives in a common format, independent of the
   underlying technologies used. 

Which is fine by me but the use of "network slice" is misleading. 

(2)

I already made this comment during the call for adoption, but I don't see it addressed in this version: It would be really cool if we can identify attributes that are **specific** to slicing vs generic ones. I'm particularly referring to the CPP defined in RFC7297:

====
   3.  Connectivity Provisioning Profile (CPP) 
     3.1.  Customer Nodes Map 
     3.2.  Scope  
     3.3.  QoS Guarantees   
     3.4.  Availability   
     3.5.  Capacity   
     3.6.  Conformance Traffic  
     3.7.  Overall Traffic Guarantees   
     3.8.  Traffic Isolation  
     3.9.  Flow Identification  
     3.10. Routing and Forwarding   
     3.11. Activation Means   
     3.12. Invocation Means   
     3.13. Notifications  
====

(3)

Both clarifications are important to be worked out for the following reasons: 
* If the "IETF Network slice" is more than connectivity, then its connectivity component does not need to signal explicitly this is about a "slice" because its presence in the "IETF Network slice" is sufficient to infer that.

* If there are no connectivity-related attributes that are specific to slicing, then we need to factorize and use a generic modelling for the connectivity component. For example, an ABNF inspired from RFC7297 would look like:   

   <NETWORK_SLICE> ::= 
                 <Some_Non_Connectivity_Component> ...
                 <Connectivity Provisioning Component> ...
   <Connectivity Provisioning Component> ::=
                              <CONNECTIVITY_PROVISIONING_PROFILE> ...
   <CONNECTIVITY_PROVISIONING_PROFILE> ::=
                              <Customer Nodes Map>
                              <Scope>
                              <QoS Guarantees>
                              <Availability>
                              <Capacity>
                              <Traffic Isolation>
                              <Conformance Traffic>
                              <Flow Identification>
                              <Overall Traffic Guarantees>
                              <Routing and Forwarding>
                              <Activation Means>
                              <Invocation Means>
                              <Notifications>
                              <Optional Information Element> ...

Cheers,
Med

> -----Message d'origine-----
> De : Teas [mailto:teas-bounces@ietf.org] De la part de Kiran
> Makhijani
> Envoyé : jeudi 22 octobre 2020 08:12
> À : teas-ns-dt@ietf.org; TEAS WG <teas@ietf.org>
> Objet : [Teas] FW: New Version Notification for draft-nsdt-teas-
> ietf-network-slice-definition-00.txt
> 
> Hello Teas and teas-ns-dt,
> FYI: Please find new version of  IETF network slices (previously
> called transport slices) definition document.
> 
> This is still a work in progress document but several comments and
> feedback received till now have been addressed. We want to share
> updates so far and look forward to further comments and discussion.
> 
> Thanks
> -Authors
> 

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