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

"Joel M. Halpern" <jmh@joelhalpern.com> Tue, 16 February 2021 16:43 UTC

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To: mohamed.boucadair@orange.com, "teas@ietf.org" <teas@ietf.org>
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From: "Joel M. Halpern" <jmh@joelhalpern.com>
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Date: Tue, 16 Feb 2021 11:43:52 -0500
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Subject: Re: [Teas] network Slice Endpoint in draft-ietf-teas-ietf-network-slice-definition-00
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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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