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

[[e-mail]]

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]>
Envoyé : mardi 22 mars 2022 10:34
À : BOUCADAIR Mohamed INNOV/NET <[e-mail]>
Cc : Adrian Farrel <[e-mail]>; TEAS WG <[e-mail]>; opsawg <[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<https://datatracker.ietf.org/doc/draft-ietf-teas-ietf-network-slices/> (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<https://datatracker.ietf.org/doc/draft-ietf-opsawg-sap/> 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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