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

mohamed.boucadair@orange.com Tue, 16 February 2021 16:05 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 16:05:13 +0000
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Subject: Re: [Teas] network Slice Endpoint in draft-ietf-teas-ietf-network-slice-definition-00
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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

> -----Message d'origine-----
> De : Teas [mailto:teas-bounces@ietf.org] De la part de Joel M.
> Halpern
> Envoyé : vendredi 5 février 2021 18:04
> À : teas@ietf.org
> Objet : [Teas] network Slice Endpoint in draft-ietf-teas-ietf-
> network-slice-definition-00
> 
> Rereading this draft, I realized that I am either confused by or
> disagree with the description of the "Network Slice Endpoint"
> contianed there.
> 
> 
> The endpoint that I think matters is the place where the IETF Network
> Slice Controller starts controlling the QoS and traffic delivery.
> The Controller doesn't care about the identity of the device outside
> of that.
> 
> Figure 1 in section 4.2 seems to define that endpoint as the network
> slice realiation endpoint, and describes the network slice endpoint
> as the thing outside the IetF network slice.  This seems counter-
> productive to me.  It complicates teh relationship between the
> endpoitn and the service being abstracted.  For example, if the
> service is beign delivered with MPLS, the Network Slice Endpoint
> likely can not put the labels on the packet for the MPLS, as it is
> outside of the IETF network Slice.  So we will need yet another layer
> of classification, and yet more interworking.
> Further, someone has to get the queueing right for traffic coming out
> of the Network Slice Endpoint.  But it is not part of the IETF
> Network Slice, so we don't have any way to get it right.
> 
> If we define the edge of the space we care about co-incident with the
> edge of the space we influence, things get a lot cleaner.
> 
> Yours,
> Joel
> 
> _______________________________________________
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> Teas@ietf.org
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