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

[Greg Mirsky <[e-mail]>]

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]> 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]>
> *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]> 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]>
> *Envoyé :* lundi 21 mars 2022 12:17
> *À :* Adrian Farrel <[e-mail]>; TEAS WG <[e-mail]>;
> opsawg <[e-mail]>; BOUCADAIR Mohamed INNOV/NET <
> [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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