Re: [OPSAWG] AD review of draft-ietf-opsawg-sap-09

"Rob Wilton (rwilton)" <rwilton@cisco.com> Fri, 09 December 2022 14:22 UTC

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From: "Rob Wilton (rwilton)" <rwilton@cisco.com>
To: "mohamed.boucadair@orange.com" <mohamed.boucadair@orange.com>, "draft-ietf-opsawg-sap.all@ietf.org" <draft-ietf-opsawg-sap.all@ietf.org>, "opsawg@ietf.org" <opsawg@ietf.org>
Thread-Topic: AD review of draft-ietf-opsawg-sap-09
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Date: Fri, 09 Dec 2022 14:22:01 +0000
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Subject: Re: [OPSAWG] AD review of draft-ietf-opsawg-sap-09
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Hi Med,

Sorry, still not clear (in my head) on the exact differentiation between sap-status and service-status.

Also, a few other nits that I spotted:
s/is capable to host/is capable of hosting/ (two places)
s/ that uniquely identifies SAP/ that uniquely identifies a SAP/
s/ are tagged as ready to host/ are tagged as being capable of hosting/

Please see inline ...

> -----Original Message-----
> From: mohamed.boucadair@orange.com
> <mohamed.boucadair@orange.com>
> Sent: 09 November 2022 15:11
> To: Rob Wilton (rwilton) <rwilton@cisco.com>; draft-ietf-opsawg-
> sap.all@ietf.org; opsawg@ietf.org
> Subject: RE: AD review of draft-ietf-opsawg-sap-09
> 
> > > >
> > > > But how do you distinguish between a SAP that hasn't been
> > > > provisioned yet to a service vs a SAP that has been provisioned
> > > > but the service is down?  E.g., trying to find a free SAP just by
> > > > looking for a SAP with a service-status of op-down doesn't appear
> > > > to be sufficient on its own.
> > >
> > > [Med] A SAP that is not provisioned yet will have a sap-status=down,
> > while
> > > the one that is provision but the service is not activated will have
> > sap-
> > > status=up and service-status=down. Isn't that sufficient?
> >
> > I would have assumed:
> >  - If sap-status is down then the service-status must also be down,
> > right?
> 
> [Med] Actually, no. The service status indicates whether a service is associated
> with the SAP. Added both the admin and op status of the service status and
> added this NEW text:
> 
> "This data node indicates whether a service is bound to this SAP and, as such,
> it is not influenced by the value of the 'sap-status'."
[Rob Wilton (rwilton)] 

" 'service-status':  Reports the status of the service for a given SAP. ...".  This states that it is reporting the status of the service for a given SAP.

For the service-status/admin-status I can see how the service can be admin-up for a SAP that is down (e.g., perhaps there is a broken fiber such that the physical interface or sub-interface is down).  But I would still find it confusing to say that the service at the SAP is operationally up on a SAP that is down.

Specifically, if a customer was to ask whether there are able to get service at a particular SAP, is it sufficient for the operator to check service-status/oper-status on the SAP, or must they check both service-status/oper-status and service-status/sap-status to know whether or not they will be receiving service at a particular SAP?

If the draft description, and perhaps even more critically, the YANG model description, can be really clear on this, I think that will help implementors and users.

Regards,
Rob