[L3sm] Feedback and operators+implementers input for L3NM draft-aguado-opsawg-l3sm-l3nm-00

Oscar González de Dios <oscar.gonzalezdedios@telefonica.com> Mon, 27 May 2019 17:19 UTC

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From: =?iso-8859-1?Q?Oscar_Gonz=E1lez_de_Dios?= <oscar.gonzalezdedios@telefonica.com>
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Thread-Topic: Feedback and operators+implementers input for L3NM draft-aguado-opsawg-l3sm-l3nm-00
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Date: Mon, 27 May 2019 17:19:32 +0000
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Subject: [L3sm] Feedback and operators+implementers input for L3NM draft-aguado-opsawg-l3sm-l3nm-00
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Dear L3SM colleagues,

     I would like to ask for feedback on an operator-led initiative to build a L3VPN Network Yang model (let's refer to it as L3NM) building on top of the work that was carried out in the L3SM working group. The first draft is available in https://tools.ietf.org/html/draft-aguado-opsawg-l3sm-l3nm-00. As the working group is now formally closed, I have also sent the email and posted the first version of the draft in the context of OPSAWG.

      Please note that the yang model itself is still a work in progress, and the first intention is to show the need of having such a model and how it related to current initiatives. The starting point of the work is the L3VPN Yang model defined in RFC 8299.  More complex deployment scenarios involving the  coordination of different VPN instances and different technologies to  provide end-to-end VPN connectivity is out of scope of this document,  but is discussed in https://tools.ietf.org/html/draft-evenwu-opsawg-yang-composed-vpn-03 .

    RFC 8309 splits the service models into "Customer Service Model" and "Service Delivery Model". The L3SM Yang model, defined in RFC 8299, is valid for the customer to network operator conversation, but if operators want to use it for the conversations between the B/OSS (business and operation support systems) and the network orchestrator (or controller, depending on the terminology used) then the model has some gaps. There are two options:

A)      "Augment" approach. This is the approach shown in version 00. The model in RFC 8299 is extended via augmentation to cover the gaps. Still, some parameters defined by L3SM may not be necessary for the network version of the service model (those more related to the customer, which are mandatory for the direct customer interface).

B)      "Prune and extend" approach. This approach will present an easier way to ignore and prune unnecessary information defined at L3SM. At the same time, any extension can be presented as part of the main module, and not as augments of an existing model. However, many content would be similar to L3SM

In the draft you can find a first set of topics covered by the model.  The scenarios covered include: the integration of ethernet and encapsulation parameters, the extension for transport resources (e.g. RTs and RDs) to be orchestrated from the management system, far-end  configuration of PEs not managed by the management system and the definition for PE identification. Note the end customer does not really care about the internal network resources, neither does care exactly which PE is used. Those decisions are taken by the operator, that then with the help of the control systems will deploy the service.

    We would like to ask input from operators/service providers who might use this model and from software implementers who might code the model.

    Best Regards,



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