[Teas] Customer control of inclusion, policy/intent, etc. [Was: Moving forward with draft-ietf-teas-ietf-network-slices]
Adrian Farrel <adrian@olddog.co.uk> Sun, 23 May 2021 17:00 UTC
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Reply-To: adrian@olddog.co.uk
From: Adrian Farrel <adrian@olddog.co.uk>
To: teas@ietf.org
Cc: 'Tarek Saad' <tsaad.net@gmail.com>, "'Joel M. Halpern'" <jmh@joelhalpern.com>, i_bryskin@yahoo.com
Date: Sun, 23 May 2021 17:59:51 +0100
Organization: Old Dog Consulting
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Subject: [Teas] Customer control of inclusion, policy/intent, etc. [Was: Moving forward with draft-ietf-teas-ietf-network-slices]
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Hi, Tarek raised an issue a couple of weeks back. Its about how a network slice customer can request constraints on the resources used in the provider network to realise the slice. I believe that, in the context of this high-level document we already have this covered in the section on Service Level Expectations (4.1.2). Obviously, we can edit that text, but it seems to me that this type of request made to the provider is unverifiable by the customer. Tarek is right that, when specifying the NBI, this sort of thing needs to be included. I would suggest that, unlike the SLOs, the SLEs will take quite a bit of careful specification. It may be that the SLEs should be specified individually in their own modules that augment the base NBI spec. Igor and Joel also had a conversation on this, and I think the conclusion was also that SLEs would normally be used for all such controls (dont send my traffic through country X, dont use devices made by company Y, dont use services provided on DC Z). If, however, the provider chooses to supply additional information about how the underlying network is designed, the customer might operate on that to specify constraints. My understanding of the relationship between provider and an external customer is that the provider is not likely to supply that information in an operational context. That might be different with an internal customer. Unless, anyone feels strongly, I propose that we move that discussion to a different thread and a different document. Best, Adrian From: Tarek Saad <tsaad.net@gmail.com> Sent: 07 May 2021 18:46 To: John E Drake <jdrake=40juniper.net@dmarc.ietf.org>; Igor Bryskin <i_bryskin=40yahoo.com@dmarc.ietf.org>; Igor Bryskin <i_bryskin@yahoo.com>; Loa Andersson <loa@pi.nu>; adrian@olddog.co.uk; mohamed.boucadair@orange.com; teas@ietf.org; Oscar González de Dios <oscar.gonzalezdedios@telefonica.com> Subject: Re: [Teas] Moving forward with draft-ietf-teas-ietf-network-slices A customer may want to have a say in defining a policy on top of the route that a NS connection can take. In absence of a common language to express such (inclusion/exclusion) policy/intent, does it suffice to express this in terms of geographies (GPS locations, countries, cities, roads), srlgs (srlgs may not have global meaning), diversity needs (from other connections), etc.? Alternatively, does it help if the NBI request expresses such inclusions/exclusions policy using/referencing a customer-centric topology that a provider may have furnished earlier to the customer, and which the provider can readily map to their network? Regards, Tarek
- [Teas] Customer control of inclusion, policy/inte… Adrian Farrel
- Re: [Teas] Customer control of inclusion, policy/… Joel M. Halpern