Re: [Teas] network Slice Endpoint in draft-ietf-teas-ietf-network-slice-definition-00

mohamed.boucadair@orange.com Tue, 16 February 2021 16:59 UTC

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From: <mohamed.boucadair@orange.com>
To: "Joel M. Halpern" <jmh@joelhalpern.com>, "teas@ietf.org" <teas@ietf.org>
Thread-Topic: [Teas] network Slice Endpoint in draft-ietf-teas-ietf-network-slice-definition-00
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Date: Tue, 16 Feb 2021 16:58:39 +0000
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Subject: Re: [Teas] network Slice Endpoint in draft-ietf-teas-ietf-network-slice-definition-00
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Re-,

Indeed. That's need to be fixed. 

As we are on the terminology, I do also suggest that the draft is updated to adhere to RFC8309. Given the recursiveness discussed in the draft, having geo-coordinates interfaces is also confusing. Inspiring from RFC8309 would make more sense.

Cheers,
Med

> -----Message d'origine-----
> De : Joel M. Halpern [mailto:jmh@joelhalpern.com]
> Envoyé : mardi 16 février 2021 17:44
> À : BOUCADAIR Mohamed TGI/OLN <mohamed.boucadair@orange.com>om>;
> teas@ietf.org
> Objet : Re: [Teas] network Slice Endpoint in draft-ietf-teas-ietf-
> network-slice-definition-00
> 
> I would be happy to use CE and PE.  I would also be happy to use
> completely different words.  The current diagram and terminology
> makes this very confusing, and leads to problems.
> 
> Yours,
> Joel
> 
> On 2/16/2021 11:39 AM, mohamed.boucadair@orange.com wrote:
> > Re-,
> >
> > Please see inline.
> >
> > Cheers,
> > Med
> >
> >> -----Message d'origine-----
> >> De : Teas [mailto:teas-bounces@ietf.org] De la part de Joel M.
> >> Halpern
> >> Envoyé : mardi 16 février 2021 17:12
> >> À : teas@ietf.org
> >> Objet : Re: [Teas] network Slice Endpoint in draft-ietf-teas-ietf-
> >> network-slice-definition-00
> >>
> >> The document is not about the request from the external customer
> (the
> >> request for the end-to-end network slice). It is about the request
> >> from other orchestration systems to the IETF Network Slice
> management
> >> systems.
> >
> > [Med] ... which is still behaving as the customer role.
> >
> >   Yes, those systems need to know where they intent to
> >> utilize the IETF network slice.  But the IETF network slice does
> not
> >> need to know about that.
> >
> > [Med] This is what I fail to see. The orchestrator has an internal
> vision that is not available to the entity asking for a slice. These
> nodes are not even known to the "other orchestration systems" when
> asking for a slice.
> >
> >>
> >> In particular, when we get to talking about configuring the IETF
> >> Network Slice properties, the edge (ingress) that the IETF Network
> >> Slice controller controls (and corresponding egress) is what needs
> to
> >> be provisioned.
> >
> > [Med] Agree, but that is a distinct phase.
> >
> > BTW, ingress/egress are as a function of the traffic direction. A
> node (PE) may behave as both ingress and egress for the same slice.
> >
> >> It is possible that on the egress side there needs to be
> information
> >> about how to deliver the traffic externally.
> >
> > [Med] Agree. That node does not need to be visible (known in
> advance) to the entity that will consume the corresponding slice.
> >
> >    But that would not be
> >> in terms of end-points since from the perspective of the IETF
> Network
> >> Slice, on the egress that is not an endpoint of anything.
> >
> > [Med] I agree that "endpoint" is confusing. "Customer Node/Edge" vs
> "Provider Edge" are my favorite here.
> >
> >>
> >> Yours,
> >> Joel
> >>
> >> On 2/16/2021 11:05 AM, mohamed.boucadair@orange.com wrote:
> >>> Hi Joel,
> >>>
> >>> I disagree with this note. I do think that both flavors of
> >> "endpoint" should be included in the draft.
> >>>
> >>> >From the customer standpoint, a slice request cannot be
> >> characterized by elements not visible to the customer. The scope
> of a
> >> requested slice can only be characterized between nodes that are
> >> known to the requestor. This is usually called, CE.
> >>>
> >>> The mapping between a CE and a network device (typically, a PE)
> is
> >> a process that is internal to the slice provider.
> >>>
> >>> The CE-PE link cannot be systematically excluded as some specific
> >> behaviors may need to be enforced in the CE-PE link. Think about a
> >> slice that is implemented by means of a PE-based VPN and which
> >> requires some specific routing + QoS policies at the CE-PE link.
> >>>
> >>> Cheers,
> >>> Med
> >
> >
> >
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