Re: [Teas] [**EXTERNAL**] Re: A question on the definitions of SDP and SAP

["Rokui, Reza" <[e-mail]>]

Wim,

As Adrian pointed out, your comment is related to IETF network slice realization. I interpret your comment that there shall be some discussions on IETF network slice framework draft about the realization.

If so, I agree that we can add some texts about this to just reflect the fact that NCS can use any approach for realization including the solution you provided. We might be able to give your example to clarify the potential multiplexing by NCS.
However, having said that I agree with Adrian that the framework document SHALL not talk about details of realization as IETF network slice is technology agnostics.

Cheers,
Reza


From: Teas <[e-mail]> on behalf of Adrian Farrel <[e-mail]>
Date: Tuesday, March 22, 2022 at 9:49 PM
To: 'Henderickx, Wim (Nokia - BE/Antwerp)' <[e-mail]>, 'Greg Mirsky' <[e-mail]>, 'Med Boucadair' <[e-mail]>
Cc: 'opsawg' <[e-mail]>, 'TEAS WG' <[e-mail]>
Subject: [**EXTERNAL**] Re: [Teas] A question on the definitions of SDP and SAP
Hi Wim,

You’re welcome to shime whenever you want.

I think it is important, in this discussion, to reflect that the service is not the realisation.

For the main part, this document describes the service and, while it must allow for multiple realisations, it does not attempt detailed descriptions.

Cheers,
Adrian

From: Teas <[e-mail]> On Behalf Of Henderickx, Wim (Nokia - BE/Antwerp)
Sent: 22 March 2022 14:09
To: Greg Mirsky <[e-mail]>; Med Boucadair <[e-mail]>
Cc: Adrian Farrel <[e-mail]>; opsawg <[e-mail]>; TEAS WG <[e-mail]>
Subject: Re: [Teas] A question on the definitions of SDP and SAP

Sorry the shime in late in this thread but there is one thing still bothering or I wanted to highlight. Maybe we can do another thread if needed.

Here is the thing I am struggling with in the current draft, which is what I call multiplexing or what I sometime call mapping.

My understanding so far is we have SDP and connectivity construct to represent a slice

In reality I believe or in my view: we have SDP – a forwarder of some sort (it is dependent on the connectivity matrix) – a connectivity matrix

On top we have some multiplexing and mapping into these constructs.

So in my view you can implement the slices in various ways. I am using 3GPP as the endpoints radio in this case
And my examples are not exhaustive but I am using to show what I mean with multiplexing/mapping

e.g.

  *   Slice1 -> Radio – vlan 1 – sdp 1 – fwd ctx 1 – connectivity matrix 1
  *   Slice2 -> radio – vlan 2 – sdp 1 – fwd ctx 2 – connectivity matrix 2

Or

  *   Slice1 -> Radio – vlan 1 – sdp 1 – fwd ctx 1 – connectivity matrix 1
  *   Slice2 -> radio – vlan 2 – sdp 1 – fwd ctx 1 – connectivity matrix 2

Or

  *   Slice1 -> Radio – flow label 1 – sdp 1 – fwd ctx 1 – connectivity matrix 1
  *   Slice2 -> radio – flow label 2– sdp 1 – fwd ctx 2 – connectivity matrix 2

Or

  *   Slice1 -> Radio – flow label 1 – sdp 1 – fwd ctx 1 – connectivity matrix 1
  *   Slice2 -> radio – flow label 2– sdp 1 – fwd ctx 1 – connectivity matrix 2

Also would be good to see if this is covered how this maps in the current framework.

From: Teas <[e-mail]<mailto:[e-mail]>> on behalf of Greg Mirsky <[e-mail]<mailto:[e-mail]>>
Date: Tuesday, 22 March 2022 at 14:50
To: Med Boucadair <[e-mail]<mailto:[e-mail]>>
Cc: Adrian Farrel <[e-mail]<mailto:[e-mail]>>, opsawg <[e-mail]<mailto:[e-mail]>>, TEAS WG <[e-mail]<mailto:[e-mail]>>
Subject: Re: [Teas] A question on the definitions of SDP and SAP
Hi Med,
thank you for the additional information. In my understanding, please correct me if it is off, L3 and L2 VPNs are technologies that can be used to realize an IETF Network Slice. If that is the case, then the SAP in, for example, an L3 VPN is also SDP of the IETF Network Slice. Am I missing something?

Kind regards,
Greg

On Tue, Mar 22, 2022 at 5:43 AM <[e-mail]<mailto:[e-mail]>> wrote:
Hi Greg,

Other examples can be an L3 VPN network access (RFC9182) or L2 VPN network access (draft-ietf-opsawg-l2nm).

FWIW, the SAP spec include these notes:

(1)

   For example,
   this concept is used to decide where to attach and, thus, deliver the
   service in the Layer 3 VPN Service Model (L3SM) [RFC8299] and the
   Layer 2 VPN Service Model (L2SM) [RFC8466].  It can also be used to
   retrieve where services, such as the Layer 3 VPN Network Model (L3NM)
   [RFC9182], and the Layer 2 VPN Network Model (L2NM)
   [I-D.ietf-opsawg-l2nm], are delivered to customers.

(2)

      For example, 'sap-id' may be the VPN network access identifier in
      Section 7.6 of [RFC9182].  An example to illustrate the use of
      this attribute during service creation is provided in Appendix D.

Cheers,
Med

De : Greg Mirsky <[e-mail]<mailto:[e-mail]>>
Envoyé : mardi 22 mars 2022 10:34
À : BOUCADAIR Mohamed INNOV/NET <[e-mail]<mailto:[e-mail]>>
Cc : Adrian Farrel <[e-mail]<mailto:[e-mail]>>; TEAS WG <[e-mail]<mailto:[e-mail]>>; opsawg <[e-mail]<mailto:[e-mail]>>
Objet : Re: A question on the definitions of SDP and SAP

Hi Med,
thank you for pointing this out to me. I have a follow-up question. If I understand that note correctly, SDP is positioned as an example, a realization of SAP in IETF Network Slice. What could be other examples or realizations of SAP?

Regards,
Greg

On Mon, Mar 21, 2022 at 4:50 AM <[e-mail]<mailto:[e-mail]>> wrote:
Hi Greg,

The slice draft already says the following:

      An SDP may be abstracted as a Service Attachment Point (SAP)
      [I-D.ietf-opsawg-sap] for the purpose generalizing the concept
      across multiple service types and representing it in management
      and configuration systems.

Cheers,
Med

De : Greg Mirsky <[e-mail]<mailto:[e-mail]>>
Envoyé : lundi 21 mars 2022 12:17
À : Adrian Farrel <[e-mail]<mailto:[e-mail]>>; TEAS WG <[e-mail]<mailto:[e-mail]>>; opsawg <[e-mail]<mailto:[e-mail]>>; BOUCADAIR Mohamed INNOV/NET <[e-mail]<mailto:[e-mail]>>
Objet : A question on the definitions of SDP and SAP

Hi Adrian,
I've read the draft-ietf-teas-ietf-network-slices [datatracker.ietf.org]<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/draft-ietf-teas-ietf-network-slices/__;!!OSsGDw!Ztmrc2f-gUk6MkF21YFNNLLE9ofruIRbenG6r7YpMxVyMxA4ThJQ0UmqhwEL$> (many thanks for all your work on it!) and I've got a question. It appears to me that the definition of a Service Demarcation Point section 2.1) as the point of where the IETF Network Slice service is delivered by the provider to a customer is similar to the definition of a Service Attachment Point in draft-ietf-opsawg-sap [datatracker.ietf.org]<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/draft-ietf-opsawg-sap/__;!!OSsGDw!Ztmrc2f-gUk6MkF21YFNNLLE9ofruIRbenG6r7YpMxVyMxA4ThJQ0b5Qo8JX$> as an "abstraction of the network reference points where network services can be delivered to customers." Hence my question. Is there an intended difference between SDP and SAP that is indicated by using different terms?

Regards,
Greg

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