Re: [OPSAWG] WG LC: draft-ietf-opsawg-sap

[tom petch <[e-mail]>]

From: [e-mail] <[e-mail]>
Sent: 27 April 2022 11:21

Hi Tom,

I'm not sure to parse your comments.

<tp>

As English, hopefully, but my point is more who needs this thing, this object class when so many have been defined previously by I2RS, OPSAWG, CCAMP, TEAS and so on. Look, for example, at RFC8345; from the start, that leaves me in no doubt what it is doing and why, and it is that sort of big picture that I lack here.  For me, this I-D talks around the abbreviation 'SAP' (one which already has a widely defined and different meaning) while never saying what it is.

Tom Petch 

SAPs are defined in the abstract, but also in the first sentence of the intro:

   From the perspective of a service provider, the Service Attachment
   Points (SAPs) are abstraction of the network reference points where
   network services can be delivered to customers.

A VPN network access (RFC9182) is an example of a SAP. VRFs are another example of SAPs. Both are called out in the draft.

Cheers,
Med

> -----Message d'origine-----
> De : OPSAWG <[e-mail]> De la part de tom petch
> Envoyé : mercredi 27 avril 2022 11:21
> À : Joe Clarke (jclarke) <jclarke=[e-mail]>;
> [e-mail]
> Objet : Re: [OPSAWG] WG LC: draft-ietf-opsawg-sap
>
> From: OPSAWG <[e-mail]> on behalf of Joe Clarke
> (jclarke) <jclarke=[e-mail]>
> Sent: 22 April 2022 20:00
>
> Hello, Opsawg.  The last round of comments on this draft have been
> discussed/resolved, and we'd like to kick off a three-week WG LC
> for this work.  Please provide any and all feedback on list before
> the end of the day May 13, 2022.
>
> <tp>
> I think that the problem with this I-D is that it does not know
> what a SAP is.  I have been using 'SAP' for decades, as in e.g.
> IEEE802, and this I-D is clearly nothing to do with a SAP, nothing
> to do with a service even.  Defining the role of a SAP as NNI or
> UNI tells me that whatever this I-D is about it is not any kind of
> S(ervice)... in any shape or form.
>
> Reverse engineering the details does not help 'its reference to a
> termination point'  TP is well defined, but having an (undefined)
> reference to it tells me nothing 'SAP is not a TTP nor a link'
> that still leaves a lot of scope!
> and much of the later text talks of binding a SAP to an interface,
> a parent interface, an attachment interface and so on so clearly a
> SAP as used here (but not elsewhere) is closely associated with
> interfaces 'sap-id uniquely a SAP within a node' so the namespace
> is local to a node which limits what it might be used for
>
> Yup, I do not know what this I-D is meant to be about.  It is a
> YANG module of a something but what that something is (clearly not
> a SAP), what use it is to have the concept of such a something in
> a network, I cannot tell.
>
> Tom Petch
>
>
> Authors, if you have suggestions for a good shepherd for this
> document, we'd love to hear them.
>
> I have requested reviews from Ops and Routing on this work.
>
> Thanks.
>
> Joe
>
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