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

mohamed.boucadair@orange.com Tue, 16 February 2021 16:40 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 16:39:02 +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-,

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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