Re: [netmod] Liaison statement to ORAN

"Jan Lindblad (jlindbla)" <jlindbla@cisco.com> Thu, 19 November 2020 10:00 UTC

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From: "Jan Lindblad (jlindbla)" <jlindbla@cisco.com>
To: =?utf-8?B?QmFsw6F6cyBMZW5neWVs?= <balazs.lengyel=40ericsson.com@dmarc.ietf.org>
CC: "netmod@ietf.org" <netmod@ietf.org>, Robert Petersen <robert.petersen@ericsson.com>, Jacqueline Beaulac S <jacqueline.s.beaulac@ericsson.com>
Thread-Topic: [netmod] Liaison statement to ORAN
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Subject: Re: [netmod] Liaison statement to ORAN
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Balázs,

+1
I think this is an important message to O-RAN, and I know similar ideas have been up for discussions in other SDOs as well. I think your proposed way of conveying the message is good.

Best Regards,
/jan


On 18 Nov 2020, at 09:09, Balázs Lengyel <balazs.lengyel=40ericsson.com@dmarc.ietf.org<mailto:balazs.lengyel=40ericsson.com@dmarc.ietf.org>> wrote:

Hello,
In connection to the draft https://tools.ietf.org/html/draft-ietf-netmod-yang-packages-01 I propose to send a liaison statement from IETF Netmod to ORAN.

The issue: 3GPP is standardizing a good number of YANG modules as part of the 3gpp TS 28.541 and 28.623 (https://forge.3gpp.org/rep/sa5/MnS/tree/Rel17-draft/yang-models).
ORAN plans to re-use this models, but possibly refine them in some ways. They are considering using deviations to do this.
E.g. change config=true schemas node to config=false. This creates problems as documented in https://tools.ietf.org/html/draft-ietf-netmod-yang-packages-01#section-5.8.1<https://tools.ietf.org/html/draft-ietf-netmod-yang-packages-01%23section-5.8.1>

-   Deviations by an SDO (standard defining organization) prevent implementations from reporting their own deviations for the same nodes.

-   Deviations by an SDO prevent implementations from conforming to the standards specified by both SDOs.


To avoid these problems I propose to send the following text to ORAN:

“IETF NETMOD working group requests ORAN to avoid using deviations as part of its specification. As documented in https://tools.ietf.org/html/draft-ietf-netmod-yang-packages-01#section-5.8.1<https://tools.ietf.org/html/draft-ietf-netmod-yang-packages-01%23section-5.8.1> the usage of deviations would prevent:

  *   Vendors to implement their own deviations for the same YANG schema nodes
  *   Vendors to claim conformance to both ORAN and 3GPP specifications which are in some cases used as a base for the ORAN YANG models

Note: These problems with deviations exists even if YANG modules are used without using YANG packages.
Regards Balazs

--
Balazs Lengyel                    Senior Specialist                       Ericsson Hungary Ltd.
Mobile: +36-70-330-7909              email: Balazs.Lengyel@ericsson.com<mailto:Balazs.Lengyel@ericsson.com>

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