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Mon, 4 Jan 2021 17:55:08 +0000 From: Alexander Clemm To: tom petch , 'Juergen Schoenwaelder' , 'Andy Bierman' , "adrian@olddog.co.uk" CC: 'NetMod WG Chairs' , 'NETMOD Group' Thread-Topic: [netmod] Adoption poll for draft-wwx-netmod-event-yang-10 Thread-Index: AQHWzOhiXaVbV6R5bE6bbeHhqkaQs6oB3waAgALAo4CAAECyAIAAMysAgAlRTQCAAVXJAIAILdGA Date: Mon, 4 Jan 2021 17:55:08 +0000 Message-ID: References: <20201223180852.rnif4ioc3tovvwkv@anna.jacobs.jacobs-university.de>, <015a01d6ddff$52cd3ef0$f867bcd0$@olddog.co.uk> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: btconnect.com; dkim=none (message not signed) header.d=none;btconnect.com; dmarc=none action=none header.from=futurewei.com; x-originating-ip: [73.189.160.186] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 68a5911b-7c2d-4692-f8e9-08d8b0d9dfff x-ms-traffictypediagnostic: BY5PR13MB3714: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: Futurewei.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BY5PR13MB3793.namprd13.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 68a5911b-7c2d-4692-f8e9-08d8b0d9dfff X-MS-Exchange-CrossTenant-originalarrivaltime: 04 Jan 2021 17:55:08.4027 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 0fee8ff2-a3b2-4018-9c75-3a1d5591fedc X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: dHU7rqqhvW70X+QVMlz2y5cn5+or3v9STE2QiwBA1ovTSq4/NAG9pD7a8IO5XtrWJLog6ozTd7hwqHd8aSTOQA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR13MB3714 Archived-At: Subject: Re: [netmod] Adoption poll for draft-wwx-netmod-event-yang-10 X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 Jan 2021 17:55:16 -0000 Hi all, First of all, happy New Year! My 2 cents: I can see that ECAs can be a slippery slope that can lead to si= gnificant complexity when not careful. That said, I do think there is valu= e in simple automation on the device, things like TCAs etc, and (looking ba= ck at history) RMON and event MIB were useful at least to some. If we resi= st from trying to make this very "general" but keep it simple, I think the = same can be the case here. We certainly should not get into complex proces= sing/actions that would require exception handling or such, but things like= "send a custom notification with data D if X happens and condition C holds= " would seem useful. So, I do think it is worthwhile to pursue this and no= t shut it down, but I agree that we need to moderate this in a way that it = focuses on the stuff that is "simple". =20 --- Alex -----Original Message----- From: netmod On Behalf Of tom petch Sent: Wednesday, December 30, 2020 4:50 AM To: 'Juergen Schoenwaelder' ; 'Andy B= ierman' ; adrian@olddog.co.uk Cc: 'NetMod WG Chairs' ; 'NETMOD Group' Subject: Re: [netmod] Adoption poll for draft-wwx-netmod-event-yang-10 From: netmod on behalf of Adrian Farrel Sent: 29 December 2020 16:26 Hi Juergen, What you say about learning lessons from the past is wise and valuable. Sadly (well, it's a good thing, really) we have new people in the IETF and = the memory of events over the last 20 years are not immediately accessible = to them. Others, who are old and grey, have been around that long but were = not necessarily involved in previous ECA discussions. Since "intent-based networking" is a big thing once again (see recent repor= ts of acquisitions in this sector) the excitement about ECA may be forgiven= , but it would help to ground the discussions if those who can remember pre= vious efforts would share their experiences or at least some pointers. Adrian, Reading Juergen's post I thought of the work of the DISMAN WG back in 2002/= 2003 which produced MIBs for alarms, events, alarm reporting and such like.= I thought it a great idea which chimed with proprietary work I had seen a= few years earlier but the IETF work seemed not to catch on. Randy was act= ive in that while Juergen could say whether or not it was the kind of thing= he had in mind. With hindsight, I suspect that Andy's point about complexity of implementat= ion was a factor. Tom Petch Best, Adrian -----Original Message----- From: netmod On Behalf Of Juergen Schoenwaelder Sent: 23 December 2020 18:09 To: Andy Bierman Cc: NetMod WG Chairs ; NETMOD Group Subject: Re: [netmod] Adoption poll for draft-wwx-netmod-event-yang-10 On Wed, Dec 23, 2020 at 07:05:44AM -0800, Andy Bierman wrote: > On Wed, Dec 23, 2020 at 3:14 AM tom petch wrote: > > > From: netmod on behalf of Dhruv Dhody <=20 > > dhruv.ietf@gmail.com> > > Sent: 21 December 2020 17:12 > > > > Hi Lou, WG, > > > > I find the motivation in the Introduction to be focused on ECA at=20 > > the network devices (with all the talk about issues with Centralized=20 > > network management). > > > > I see the value of ECA on the controller as well, say a customer=20 > > network controller or an orchestrator can set the ECA on a central=20 > > controller (reference ACTN in TEAS WG). Perhaps you would consider=20 > > adding a sentence to describe this as well. The client-server=20 > > terminology in the rest of the document covers it already. > > > > And I do see value in this and support adoption. > > > > > > My take is that the I-D is unclear on what ECA is. > > > > ECA has been worked on in at least two IETF WG AFAICT. It cropped=20 > > up in I2RS but as I recall, it was along the lines of 'This is ECA' =20 > > 'No It is not' 'Yes it is' which gave me the impression that ECA is=20 > > not a well-defined, or well-understood, term. > > > > More recently, I2NSF have produced a YANG capability-data-model=20 > > which is > > 55 pages of ECA. Lacking a definition in this netmod I-D, I am=20 > > unclear what the relationship is between the I2NSF I-D and the=20 > > netmod I-D, whether > > or not they are using ECA in the same sense. > > > > > Hi Tom, > > It usually helps to agree on the problem-space before focusing on the=20 > solution-space. > ECA seems like a methodology (ala MVC) more than anything else. > The problem statement seems to be that some client tasks need to be handled > on the > server using ECA methodology, instead of on the client. > Which tasks? Seems to be any task of arbitrary purpose or complexity. > And now the scope is supposed to include controllers (just another client), > so the problem-stmt > is even less clear. > > The traditional approach is to pick specific client tasks to move to=20 > the server. > The example of detecting and reporting route-flaps has been used. > (No ECA example of this complexity has been provided yet). > The traditional approach would be to write a route-flap-detection YANG=20 > module with some configuration, monitoring data, and notification=20 > events. > > The generalized approach is likely to be extremely complex to=20 > standardize and implement. > ECA work has a long 20+ year tradition in the IETF and several specificatio= ns have been published over the years by various working groups. As far as = I can tell, none of them got traction in terms of signifiant deployment of = interoperable implementations. I would have hoped that the next iteration of ECA work would have started w= ith a deep reflection about why all the previous attempts failed to gain tr= action and some genuine insights how to design things differently in order = to improve the likelihood to have impact. /js -- Juergen Schoenwaelder Jacobs University Bremen gGmbH Phone: +49 421 200 3587 Campus Ring 1 | 28759 Bremen | Germany Fax: +49 421 200 3103 _______________________________________________ netmod mailing list netmod@ietf.org https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.iet= f.org%2Fmailman%2Flistinfo%2Fnetmod&data=3D04%7C01%7Calex%40futurewei.c= om%7C0beb4699b9a0495dba0b08d8acc162c6%7C0fee8ff2a3b240189c753a1d5591fedc%7C= 1%7C0%7C637449293911559532%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQ= IjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3DaacWB%2BxWlKp= msS9v%2FRSUY%2BbxWdKxUIfZRcnjjGtSQ7o%3D&reserved=3D0 _______________________________________________ netmod mailing list netmod@ietf.org https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.iet= f.org%2Fmailman%2Flistinfo%2Fnetmod&data=3D04%7C01%7Calex%40futurewei.c= om%7C0beb4699b9a0495dba0b08d8acc162c6%7C0fee8ff2a3b240189c753a1d5591fedc%7C= 1%7C0%7C637449293911559532%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQ= IjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3DaacWB%2BxWlKp= msS9v%2FRSUY%2BbxWdKxUIfZRcnjjGtSQ7o%3D&reserved=3D0 _______________________________________________ netmod mailing list netmod@ietf.org https://nam11.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwww.iet= f.org%2Fmailman%2Flistinfo%2Fnetmod&data=3D04%7C01%7Calex%40futurewei.c= om%7C0beb4699b9a0495dba0b08d8acc162c6%7C0fee8ff2a3b240189c753a1d5591fedc%7C= 1%7C0%7C637449293911559532%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQ= IjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=3DaacWB%2BxWlKp= msS9v%2FRSUY%2BbxWdKxUIfZRcnjjGtSQ7o%3D&reserved=3D0 From nobody Mon Jan 4 15:06:17 2021 Return-Path: X-Original-To: netmod@ietfa.amsl.com Delivered-To: netmod@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 279FC3A0A0B; Mon, 4 Jan 2021 15:06:15 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: 0 X-Spam-Level: X-Spam-Status: No, score=0 tagged_above=-999 required=5 tests=[SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id IYwfgxwrRSEl; Mon, 4 Jan 2021 15:06:12 -0800 (PST) Received: from rfc-editor.org (rfc-editor.org [4.31.198.49]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7460F3A09E9; Mon, 4 Jan 2021 15:06:12 -0800 (PST) Received: by rfc-editor.org (Postfix, from userid 30) id 954B2F40754; Mon, 4 Jan 2021 15:06:10 -0800 (PST) To: ietf-announce@ietf.org, rfc-dist@rfc-editor.org X-PHP-Originating-Script: 1005:ams_util_lib.php From: rfc-editor@rfc-editor.org Cc: rfc-editor@rfc-editor.org, drafts-update-ref@iana.org, netmod@ietf.org Content-type: text/plain; charset=UTF-8 Message-Id: <20210104230610.954B2F40754@rfc-editor.org> Date: Mon, 4 Jan 2021 15:06:10 -0800 (PST) Archived-At: Subject: [netmod] =?utf-8?q?RFC_8819_on_YANG_Module_Tags?= X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 04 Jan 2021 23:06:15 -0000 A new Request for Comments is now available in online RFC libraries. RFC 8819 Title: YANG Module Tags Author: C. Hopps, L. Berger, D. Bogdanovic Status: Standards Track Stream: IETF Date: January 2021 Mailbox: chopps@chopps.org, lberger@labn.net, ivandean@gmail.com Pages: 19 Updates: RFC 8407 I-D Tag: draft-ietf-netmod-module-tags-10.txt URL: https://www.rfc-editor.org/info/rfc8819 DOI: 10.17487/RFC8819 This document provides for the association of tags with YANG modules. The expectation is for such tags to be used to help classify and organize modules. A method for defining, reading, and writing modules tags is provided. Tags may be registered and assigned during module definition, assigned by implementations, or dynamically defined and set by users. This document also provides guidance to future model writers; as such, this document updates RFC 8407. This document is a product of the Network Modeling Working Group of the IETF. This is now a Proposed Standard. 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The RFC Editor Team Association Management Solutions, LLC From nobody Tue Jan 5 06:18:05 2021 Return-Path: X-Original-To: netmod@ietf.org Delivered-To: netmod@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id CF3C63A0F46; Tue, 5 Jan 2021 06:17:59 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: netmod@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.24.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: netmod@ietf.org Message-ID: <160985627980.17103.15655186257841903652@ietfa.amsl.com> Date: Tue, 05 Jan 2021 06:17:59 -0800 Archived-At: Subject: [netmod] I-D Action: draft-ietf-netmod-yang-versioning-reqs-04.txt X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 Jan 2021 14:18:00 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Network Modeling WG of the IETF. Title : YANG Module Versioning Requirements Author : Joe Clarke Filename : draft-ietf-netmod-yang-versioning-reqs-04.txt Pages : 12 Date : 2021-01-05 Abstract: This document describes the problems that can arise because of the YANG language module update rules, that require all updates to YANG module preserve strict backwards compatibility. It also defines the requirements on any solution designed to solve the stated problems. This document does not consider possible solutions, nor endorse any particular solution. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-netmod-yang-versioning-reqs/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-netmod-yang-versioning-reqs-04 https://datatracker.ietf.org/doc/html/draft-ietf-netmod-yang-versioning-reqs-04 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-netmod-yang-versioning-reqs-04 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. 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Tue, 5 Jan 2021 14:25:50 +0000 From: "Joe Clarke (jclarke)" To: NetMod WG CC: "i-d-announce@ietf.org" Thread-Topic: [netmod] I-D Action: draft-ietf-netmod-yang-versioning-reqs-04.txt Thread-Index: AQHW4225tdhGyKdwG0658zOXinAebqoZFnkA Date: Tue, 5 Jan 2021 14:25:50 +0000 Message-ID: References: <160985627980.17103.15655186257841903652@ietfa.amsl.com> In-Reply-To: <160985627980.17103.15655186257841903652@ietfa.amsl.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: Apple Mail (2.3654.40.0.2.32) authentication-results: ietf.org; dkim=none (message not signed) header.d=none;ietf.org; dmarc=none action=none header.from=cisco.com; x-originating-ip: [2001:420:2481:6:41a5:a955:fbf7:aa6b] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: f6cb7638-c6ef-4f31-c91a-08d8b185cd70 x-ms-traffictypediagnostic: BN8PR11MB3556: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:8882; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; 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Just bumping to keep this active while the other draft= s are being refined. Joe > On Jan 5, 2021, at 09:17, internet-drafts@ietf.org wrote: >=20 >=20 > A New Internet-Draft is available from the on-line Internet-Drafts direct= ories. > This draft is a work item of the Network Modeling WG of the IETF. >=20 > Title : YANG Module Versioning Requirements > Author : Joe Clarke > Filename : draft-ietf-netmod-yang-versioning-reqs-04.txt > Pages : 12 > Date : 2021-01-05 >=20 > Abstract: > This document describes the problems that can arise because of the > YANG language module update rules, that require all updates to YANG > module preserve strict backwards compatibility. It also defines the > requirements on any solution designed to solve the stated problems. > This document does not consider possible solutions, nor endorse any > particular solution. >=20 >=20 > The IETF datatracker status page for this draft is: > https://datatracker.ietf.org/doc/draft-ietf-netmod-yang-versioning-reqs/ >=20 > There are also htmlized versions available at: > https://tools.ietf.org/html/draft-ietf-netmod-yang-versioning-reqs-04 > https://datatracker.ietf.org/doc/html/draft-ietf-netmod-yang-versioning-r= eqs-04 >=20 > A diff from the previous version is available at: > https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-netmod-yang-versioning-req= s-04 >=20 >=20 > Please note that it may take a couple of minutes from the time of submiss= ion > until the htmlized version and diff are available at tools.ietf.org. >=20 > Internet-Drafts are also available by anonymous FTP at: > ftp://ftp.ietf.org/internet-drafts/ >=20 >=20 > _______________________________________________ > netmod mailing list > netmod@ietf.org > https://www.ietf.org/mailman/listinfo/netmod From nobody Tue Jan 5 07:26:18 2021 Return-Path: X-Original-To: netmod@ietfa.amsl.com Delivered-To: netmod@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 527D93A0FDE for ; 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Tue, 5 Jan 2021 15:26:12 +0000 From: "Sterne, Jason (Nokia - CA/Ottawa)" To: "netmod@ietf.org" Thread-Topic: NETMOD Versioning virtual interim #2 - Week of Feb 1, 2021 - poll for attendees Thread-Index: AdbUxHNaYV+25IoQRI+oab9ajVEERgOr9GMA Date: Tue, 5 Jan 2021 15:26:12 +0000 Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: ietf.org; dkim=none (message not signed) header.d=none;ietf.org; dmarc=none action=none header.from=nokia.com; x-originating-ip: [24.226.236.156] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 0aff8fe0-599e-4ddd-745d-08d8b18e3c2a x-ms-traffictypediagnostic: DM6PR08MB6060: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:8882; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255; 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boundary="_000_DM6PR08MB508484BA0769D1A406157E739BD10DM6PR08MB5084namp_" MIME-Version: 1.0 X-OriginatorOrg: nokia.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM6PR08MB5084.namprd08.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 0aff8fe0-599e-4ddd-745d-08d8b18e3c2a X-MS-Exchange-CrossTenant-originalarrivaltime: 05 Jan 2021 15:26:12.4843 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5d471751-9675-428d-917b-70f44f9630b0 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 8Zz6qcsmhuVENH+Dfl3u3hemP9VtiHfGxIX60mf3chLJZNPiBiu++AkQ6sm4kEyH/MwEQ0rGLbHQRp1d8TcQcw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR08MB6060 Archived-At: Subject: Re: [netmod] NETMOD Versioning virtual interim #2 - Week of Feb 1, 2021 - poll for attendees X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 Jan 2021 15:26:16 -0000 --_000_DM6PR08MB508484BA0769D1A406157E739BD10DM6PR08MB5084namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hello WG, In our weekly YANG Versioning call today we decided that we should tackle t= he meaning of BC vs NBC for config false nodes in the Feb virtual interim. We're also unlikely to get through all of the topics below so the updated a= genda of topics is as follows: T1) Definition/meaning of BC vs NBC for config false nodes https://github.com/netmod-wg/yang-ver-dt/issues/15 T2) IANA considerations: how are final RFC revision labels assigned ? https://github.com/netmod-wg/yang-ver-dt/issues/59 T3) YANG file naming when revision labels are being used (symbolic links? @= ) ? T4) SemVer: gaps in history, removing revision statements https://github.com/netmod-wg/yang-ver-dt/issues/61 Please indicate your availability on the doodle poll (link below). Rgds, Jason From: netmod On Behalf Of Sterne, Jason (Nokia - = CA/Ottawa) Sent: Thursday, December 17, 2020 6:12 PM To: netmod@ietf.org Subject: [netmod] NETMOD Versioning virtual interim #2 - Week of Feb 1, 202= 1 - poll for attendees Hi all, The first Virtual Interim for YANG Versioning topics was quite useful. Than= ks to all who attended and helped prepare. We're going to hold a second interim in the first week of February. ### YOUR RESPONSE REQUESTED ### Please fill in the doodle poll with what days in the Feb 1-4 range you coul= d arrange your schedule to attend. - If you will, or even *may* attend, then please fill in the doodle poll - if you don't intend to attend, then please do not fill in the doodle poll https://doodle.com/poll/b5uveesppy8sf6rm The focus of versioning interim #2 is likely the following topics (we may n= ot get through all of them): 1) IANA considerations: how are final RFC revision labels assigned ? https://github.com/netmod-wg/yang-ver-dt/issues/59 2) YANG file naming when revision labels are being used (symbolic links? @<= revision-label>) ? 3) SemVer: mandatory for IETF ? https://github.com/netmod-wg/yang-ver-dt/issues/45 4) SemVer: initial revision label for drafts and RFC updates https://github.com/netmod-wg/yang-ver-dt/issues/60 5) SemVer: gaps in history, removing revision statements https://github.com/netmod-wg/yang-ver-dt/issues/61 Topics 1 and 2 are related to YANG module versioning: https://datatracker.ietf.org/doc/draft-ietf-netmod-yang-module-versioning/ Topics 3-5 are related to the Semver draft: https://datatracker.ietf.org/doc/draft-ietf-netmod-yang-semver As before, we will send materials before the meeting. Rgds, Jason --_000_DM6PR08MB508484BA0769D1A406157E739BD10DM6PR08MB5084namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hello WG,

 

In our weekly YANG Versioning call today we decided = that we should tackle the meaning of BC vs NBC for config false nodes in th= e Feb virtual interim.

 

We're also unlikely to get through all of the topics= below so the updated agenda of topics is as follows:

 

T1) Definition/meaning = of BC vs NBC for config false nodes

https://github.com/netmod-wg/yang-v= er-dt/issues/15

 

T2) IANA considerations= : how are final RFC revision labels assigned ?

https://github.com/netmod-wg/yang-v= er-dt/issues/59

 

T3) YANG file naming wh= en revision labels are being used (symbolic links? @<revision-label>)= ?

 

T4) SemVer: gaps in his= tory, removing revision statements

https://github.com/netmod-wg/yang-v= er-dt/issues/61

 

Please indicate your availability on the doodle poll= (link below).

 

Rgds,
Jason

 

From: netmod <netmod-bounces@ietf.org> On Behalf Of Sterne, Jason (Nokia - CA/Ottawa)
Sent: Thursday, December 17, 2020 6:12 PM
To: netmod@ietf.org
Subject: [netmod] NETMOD Versioning virtual interim #2 - Week of Feb= 1, 2021 - poll for attendees

 

Hi all,

 

The first Virtual Interim for YANG Versioning topics= was quite useful. Thanks to all who attended and helped prepare.

 

We're going to hold a second interim in the first we= ek of February.

 

### YOUR RESPONSE REQUESTED ###=

Please fill in the doodle poll with what days in the= Feb 1-4 range you could arrange your schedule to attend.

- If you will, or even *may* attend, then ple= ase fill in the doodle poll

- if you don't intend to attend, then please do not = fill in the doodle poll

https://doodle.com/poll/b5uveesppy8sf6rm

 

The focus of versioning interim #2 is likely the fol= lowing topics (we may not get through all of them):

 

1) IANA considerations:= how are final RFC revision labels assigned ?

https://github.com/netmod-wg/yang-v= er-dt/issues/59

 

2) YANG file naming whe= n revision labels are being used (symbolic links? @<revision-label>) = ?

 

3) SemVer: mandatory fo= r IETF ?

https://github.com/netmod-wg/yang-v= er-dt/issues/45

 

4) SemVer: initial revi= sion label for drafts and RFC updates

https://github.com/netmod-wg/yang-v= er-dt/issues/60

 

5) SemVer: gaps in hist= ory, removing revision statements

https://github.com/netmod-wg/yang-v= er-dt/issues/61

 

 

Topics 1 and 2 are related to YANG module versioning= :

https://datatracker.ietf.org/doc/draft-i= etf-netmod-yang-module-versioning/

 

Topics 3-5 are related to the Semver draft:

https://datatracker.ietf.org/doc/draft-ietf-netmod-y= ang-semver

 

As before, we will send materials before the meeting= .

 

Rgds,

Jason

 

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boundary="_000_DM6PR08MB508424D127965412E3EDCAF49BD10DM6PR08MB5084namp_" MIME-Version: 1.0 X-OriginatorOrg: nokia.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM6PR08MB5084.namprd08.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: d086d059-e5d8-4eac-f348-08d8b1906893 X-MS-Exchange-CrossTenant-originalarrivaltime: 05 Jan 2021 15:41:45.9439 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5d471751-9675-428d-917b-70f44f9630b0 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: UkZBkqw7JJp1+EV6L9oeqQ9Krddx5VP+ZKlGwow+YYHDph2LZqlBWsER2veFNFBZg/SO/GS9xZvRmxpuW8xmfQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR08MB5802 Archived-At: Subject: [netmod] YANG Versioning Weekly Call Minutes - 2021-01-05 X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 Jan 2021 15:42:02 -0000 --_000_DM6PR08MB508424D127965412E3EDCAF49BD10DM6PR08MB5084namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable YANG Versioning Weekly Call Minutes - 2021-01-05 (see the link below to join the calls) Key topics & next steps for the versioning work: A) drafts expiring (reqs, versioning, semver) -> bump requirements draft -> let versioning and semver expire until real updates or IETF 110 B) open issues review (yang versioning first) -> we left off at issue #15 https://github.com/netmod-wg/yang-ver-dt/i= ssues/15 C) next virtual interim (who preparing what?) -> Balazs for config false rules D) ORAN/3GPP liaison statement E) Whitespace issue Add new topic to Feb virtual interim: ## new: 0) Definition/meaning of BC vs NBC for config false nodes Move the Semver "gaps in history" issue as the first Semver issue for the F= eb virtual interim BC vs NBC for config false nodes: - review expectations of clients (e.g. handle unknown tags, handle values o= utside the 'range' statement) - no validation on outgoing data today in 7950. Is that an indication that = there are no guarantees on config false nodes? - changing type should be NBC for config true or false nodes (**including c= hanging something to a union that is a superset of the previous type? -> ye= s, receiver may suddenly get that new member) - reverse the meaning of some rules (expanding vs shrinking value spaces), = but look at 3.3 - adding mandatory: different rule for config true vs false? - suggested approach: go through 7950 rules and try to stick with them as m= uch as we can for config false, but define/highlight rules that should be d= ifferent for config false [Balazs to take a first stab at the rules] Jason NETMOD Working Group changed the Webex meeting information. When it's time, join the Webex meeting here. Meeting number (access code): 171 069 0374 Meeting password: semver? Occurs every Tuesday effective Tuesday, September 1, 2020 until Tuesday, Au= gust 24, 2021 from 9:00 AM to 10:00 AM, (UTC-04:00) Eastern Time (US & Cana= da) 9:00 am | (UTC-04:00) Eastern Time (US & Canada) | 1 hr Join meeting Tap to join from a mobile device (attendees only) +1-650-479-3208,,1710690374## Call-in toll number (US/Canada) Join by phone 1-650-479-3208 Call-in toll number (US/Canada) Global call-in numbers Join from a video system or application Dial 1710690374@ietf.webex.com<%20sip:1710690374@ietf.webex.com> You can also dial 173.243.2.68 and enter your meeting number. Join using Microsoft Lync or Microsoft Skype for Business Dial 1710690374.ietf@lync.webex.com<%20sip:1710690374.ietf@lync.webex.com> Need help? Go to http://help.webex.com --_000_DM6PR08MB508424D127965412E3EDCAF49BD10DM6PR08MB5084namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

YANG Versioning Weekly Call Min= utes - 2021-01-05

(see the link below to join the= calls)

 

Key topics & next steps for= the versioning work:

A) drafts expiring (reqs, versi= oning, semver)

    -> bump r= equirements draft

    -> let ve= rsioning and semver expire until real updates or IETF 110=

B) open issues review (yang ver= sioning first)

    -> we lef= t off at issue #15  https://github.= com/netmod-wg/yang-ver-dt/issues/15

C) next virtual interim (who pr= eparing what?)

    -> Balazs= for config false rules

D) ORAN/3GPP liaison statement<= o:p>

E) Whitespace issue<= /span>

 

Add new topic to Feb virtual in= terim:

## new: 0) Definition/meaning o= f BC vs NBC for config false nodes

 

Move the Semver "gaps in h= istory" issue as the first Semver issue for the Feb virtual interim

 

BC vs NBC for config false node= s:

- review expectations of client= s (e.g. handle unknown tags, handle values outside the 'range' statement)

- no validation on outgoing dat= a today in 7950. Is that an indication that there are no guarantees on conf= ig false nodes?

- changing type should be NBC f= or config true or false nodes (**including changing something to a union th= at is a superset of the previous type? -> yes, receiver may suddenly get= that new member)

- reverse the meaning of some r= ules (expanding vs shrinking value spaces), but look at 3.3

- adding mandatory: different r= ule for config true vs false?

- suggested approach: go throug= h 7950 rules and try to stick with them as much as we can for config false,= but define/highlight rules that should be different for config false<= /o:p>

[Balazs to take a first stab at= the rules]

 

Jason

 

 

NETMOD Working Group changed the Webex meeting information.

 

When it's time, join the Webex meeting here.

 

 

Meeting number (access code): 171 069 0374

 

Meeting password: semver?

 

 

Occurs every Tuesday effective Tuesday, September 1, 2020 unti= l Tuesday, August 24, 2021 from 9:00 AM to 10:00 AM, (UTC-04:00) Eastern Ti= me (US & Canada)

9:00 am  |  (UTC-04:00) Eastern Time (US &= amp; Canada)  |  1 hr

 

 

 

Join meeting

 

 

 

Tap to join from a mobile device (attendees only)

+1-650-479-3208,,1710690374## Call-in toll number (US/Canada)

 

 

Join by phone

1-650-479-3208 Call-in toll number (US/Canada)=

G= lobal call-in numbers

 

 

 

Join from a video system or application<= /p>

Dial 1710690374@ietf.webex.com

You can also dial 173.243.2.68 and enter your meeting number.<= o:p>

 

 

 

Join using Microsoft Lync or Microsoft Skype for Business=

Dial 1710690374.ietf@lync.webex.com

 

 

 

Need help? Go to http:= //help.webex.com

 

 

--_000_DM6PR08MB508424D127965412E3EDCAF49BD10DM6PR08MB5084namp_-- From nobody Tue Jan 5 13:07:13 2021 Return-Path: X-Original-To: netmod@ietfa.amsl.com Delivered-To: netmod@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DEF563A1215; Tue, 5 Jan 2021 13:07:11 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.897 X-Spam-Level: X-Spam-Status: No, score=-1.897 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id aOLcI9vKaXFt; Tue, 5 Jan 2021 13:07:09 -0800 (PST) Received: from nagasaki.bogus.com (nagasaki.bogus.com [IPv6:2001:418:1::81]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 43CA13A1211; Tue, 5 Jan 2021 13:07:09 -0800 (PST) Received: from jmbp.local ([IPv6:2601:1c0:cb00:5dd1:2c80:2c7d:875d:fc1d]) (authenticated bits=0) by nagasaki.bogus.com (8.15.2/8.15.2) with ESMTPSA id 105L77ou097063; Tue, 5 Jan 2021 21:07:08 GMT (envelope-from joelja@bogus.com) X-Authentication-Warning: nagasaki.bogus.com: Host [IPv6:2601:1c0:cb00:5dd1:2c80:2c7d:875d:fc1d] claimed to be jmbp.local To: "netmod@ietf.org" Cc: "netmod-chairs@ietf.org" References: <20210104230610.954B2F40754@rfc-editor.org> From: Joel Jaeggli Message-ID: Date: Tue, 5 Jan 2021 13:07:00 -0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: <20210104230610.954B2F40754@rfc-editor.org> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US Archived-At: Subject: [netmod] Congratulations... Re: RFC 8819 on YANG Module Tags X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 05 Jan 2021 21:07:12 -0000 On getting this one out the door. The utility of this work to all of us is greatly appreciated. joel On 1/4/21 15:06, rfc-editor@rfc-editor.org wrote: > A new Request for Comments is now available in online RFC libraries. > > > RFC 8819 > > Title: YANG Module Tags > Author: C. Hopps, > L. Berger, > D. Bogdanovic > Status: Standards Track > Stream: IETF > Date: January 2021 > Mailbox: chopps@chopps.org, > lberger@labn.net, > ivandean@gmail.com > Pages: 19 > Updates: RFC 8407 > > I-D Tag: draft-ietf-netmod-module-tags-10.txt > > URL: https://www.rfc-editor.org/info/rfc8819 > > DOI: 10.17487/RFC8819 > > This document provides for the association of tags with YANG modules. > The expectation is for such tags to be used to help classify and > organize modules. A method for defining, reading, and writing modules > tags is provided. Tags may be registered and assigned during module > definition, assigned by implementations, or dynamically defined and > set by users. This document also provides guidance to future model > writers; as such, this document updates RFC 8407. > > This document is a product of the Network Modeling Working Group of the IETF. > > This is now a Proposed Standard. > > STANDARDS TRACK: This document specifies an Internet Standards Track > protocol for the Internet community, and requests discussion and suggestions > for improvements. Please refer to the current edition of the Official > Internet Protocol Standards (https://www.rfc-editor.org/standards) for the > standardization state and status of this protocol. Distribution of this > memo is unlimited. > > This announcement is sent to the IETF-Announce and rfc-dist lists. > To subscribe or unsubscribe, see > https://www.ietf.org/mailman/listinfo/ietf-announce > https://mailman.rfc-editor.org/mailman/listinfo/rfc-dist > > For searching the RFC series, see https://www.rfc-editor.org/search > For downloading RFCs, see https://www.rfc-editor.org/retrieve/bulk > > Requests for special distribution should be addressed to either the > author of the RFC in question, or to rfc-editor@rfc-editor.org. Unless > specifically noted otherwise on the RFC itself, all RFCs are for > unlimited distribution. > > > The RFC Editor Team > Association Management Solutions, LLC > > _______________________________________________ > netmod mailing list > netmod@ietf.org > https://www.ietf.org/mailman/listinfo/netmod > From nobody Tue Jan 12 05:56:10 2021 Return-Path: X-Original-To: netmod@ietfa.amsl.com Delivered-To: netmod@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id EA0F73A126D for ; Tue, 12 Jan 2021 05:56:08 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -2.15 X-Spam-Level: X-Spam-Status: No, score=-2.15 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.25, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=nokia.onmicrosoft.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id LvgW35SmiKLT for ; 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boundary="_000_DM6PR08MB50840A58039E5ACF37AAEA489BAA0DM6PR08MB5084namp_" MIME-Version: 1.0 X-OriginatorOrg: nokia.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM6PR08MB5084.namprd08.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: c59ec724-7f67-4d6c-598a-08d8b701cce4 X-MS-Exchange-CrossTenant-originalarrivaltime: 12 Jan 2021 13:56:03.2373 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5d471751-9675-428d-917b-70f44f9630b0 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: /c3gWOWSfcFI5oBllMMQYI6ZUEOXWH4XHnnoUTo30wQiXHAMfGBO0p1Os+BYSg+0NNgFr+nN7jyJeXlK4bL4Vw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR08MB4153 Archived-At: Subject: [netmod] Defining YANG backwards compatibility rules for state X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Jan 2021 13:56:09 -0000 --_000_DM6PR08MB50840A58039E5ACF37AAEA489BAA0DM6PR08MB5084namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi all, One topic that we're planning to discuss in the NETMOD virtual interim meet= ing in Feb is how to define backwards compatibility for YANG state (config = false). It would be great to get your participation in the discussion. If you migh= t be able to attend, please indicate your preferred date for the virtual in= terim here: https://doodle.com/poll/b5uveesppy8sf6rm Rgds, Jason From: Sterne, Jason (Nokia - CA/Ottawa) Sent: Tuesday, January 5, 2021 10:26 AM To: netmod@ietf.org Subject: RE: NETMOD Versioning virtual interim #2 - Week of Feb 1, 2021 - p= oll for attendees Hello WG, In our weekly YANG Versioning call today we decided that we should tackle t= he meaning of BC vs NBC for config false nodes in the Feb virtual interim. We're also unlikely to get through all of the topics below so the updated a= genda of topics is as follows: T1) Definition/meaning of BC vs NBC for config false nodes https://github.com/netmod-wg/yang-ver-dt/issues/15 T2) IANA considerations: how are final RFC revision labels assigned ? https://github.com/netmod-wg/yang-ver-dt/issues/59 T3) YANG file naming when revision labels are being used (symbolic links? @= ) ? T4) SemVer: gaps in history, removing revision statements https://github.com/netmod-wg/yang-ver-dt/issues/61 Please indicate your availability on the doodle poll (link below). Rgds, Jason From: netmod > On B= ehalf Of Sterne, Jason (Nokia - CA/Ottawa) Sent: Thursday, December 17, 2020 6:12 PM To: netmod@ietf.org Subject: [netmod] NETMOD Versioning virtual interim #2 - Week of Feb 1, 202= 1 - poll for attendees Hi all, The first Virtual Interim for YANG Versioning topics was quite useful. Than= ks to all who attended and helped prepare. We're going to hold a second interim in the first week of February. ### YOUR RESPONSE REQUESTED ### Please fill in the doodle poll with what days in the Feb 1-4 range you coul= d arrange your schedule to attend. - If you will, or even *may* attend, then please fill in the doodle poll - if you don't intend to attend, then please do not fill in the doodle poll https://doodle.com/poll/b5uveesppy8sf6rm The focus of versioning interim #2 is likely the following topics (we may n= ot get through all of them): 1) IANA considerations: how are final RFC revision labels assigned ? https://github.com/netmod-wg/yang-ver-dt/issues/59 2) YANG file naming when revision labels are being used (symbolic links? @<= revision-label>) ? 3) SemVer: mandatory for IETF ? https://github.com/netmod-wg/yang-ver-dt/issues/45 4) SemVer: initial revision label for drafts and RFC updates https://github.com/netmod-wg/yang-ver-dt/issues/60 5) SemVer: gaps in history, removing revision statements https://github.com/netmod-wg/yang-ver-dt/issues/61 Topics 1 and 2 are related to YANG module versioning: https://datatracker.ietf.org/doc/draft-ietf-netmod-yang-module-versioning/ Topics 3-5 are related to the Semver draft: https://datatracker.ietf.org/doc/draft-ietf-netmod-yang-semver As before, we will send materials before the meeting. Rgds, Jason --_000_DM6PR08MB50840A58039E5ACF37AAEA489BAA0DM6PR08MB5084namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi all,

 

One topic that we're planning to discuss in the NETM= OD virtual interim meeting in Feb is how to define backwards compatibility = for YANG state (config false).

 

It would be great to get your participation in the d= iscussion.  If you might be able to attend, please indicate your prefe= rred date for the virtual interim here:

https://doodle.com/poll/b5uveesppy8sf6rm

 

Rgds,

Jason

 

From: Sterne, Jason (Nokia - CA/Ottawa)
Sent: Tuesday, January 5, 2021 10:26 AM
To: netmod@ietf.org
Subject: RE: NETMOD Versioning virtual interim #2 - Week of Feb 1, 2= 021 - poll for attendees

 

Hello WG,

 

In our weekly YANG Versioning call today we decided = that we should tackle the meaning of BC vs NBC for config false nodes in th= e Feb virtual interim.

 

We're also unlikely to get through all of the topics= below so the updated agenda of topics is as follows:

 

T1) Definition/meaning = of BC vs NBC for config false nodes

https://github.com/netmod-wg/yang-v= er-dt/issues/15

 

T2) IANA considerations= : how are final RFC revision labels assigned ?

https://github.com/netmod-wg/yang-v= er-dt/issues/59

 

T3) YANG file naming wh= en revision labels are being used (symbolic links? @<revision-label>)= ?

 

T4) SemVer: gaps in his= tory, removing revision statements

https://github.com/netmod-wg/yang-v= er-dt/issues/61

 

Please indicate your availability on the doodle poll= (link below).

 

Rgds,
Jason

 

From: netmod <netmod-bounc= es@ietf.org> On Behalf Of Sterne, Jason (Nokia - CA/Ottawa)
Sent: Thursday, December 17, 2020 6:12 PM
To: netmod@ietf.org
Subject: [netmod] NETMOD Versioning virtual interim #2 - Week of Feb= 1, 2021 - poll for attendees

 

Hi all,

 

The first Virtual Interim for YANG Versioning topics= was quite useful. Thanks to all who attended and helped prepare.

 

We're going to hold a second interim in the first we= ek of February.

 

### YOUR RESPONSE REQUESTED ###=

Please fill in the doodle poll with what days in the= Feb 1-4 range you could arrange your schedule to attend.

- If you will, or even *may* attend, then ple= ase fill in the doodle poll

- if you don't intend to attend, then please do not = fill in the doodle poll

https://doodle.com/poll/b5uveesppy8sf6rm

 

The focus of versioning interim #2 is likely the fol= lowing topics (we may not get through all of them):

 

1) IANA considerations:= how are final RFC revision labels assigned ?

https://github.com/netmod-wg/yang-v= er-dt/issues/59

 

2) YANG file naming whe= n revision labels are being used (symbolic links? @<revision-label>) = ?

 

3) SemVer: mandatory fo= r IETF ?

https://github.com/netmod-wg/yang-v= er-dt/issues/45

 

4) SemVer: initial revi= sion label for drafts and RFC updates

https://github.com/netmod-wg/yang-v= er-dt/issues/60

 

5) SemVer: gaps in hist= ory, removing revision statements

https://github.com/netmod-wg/yang-v= er-dt/issues/61

 

 

Topics 1 and 2 are related to YANG module versioning= :

https://datatracker.ietf.org/doc/draft-i= etf-netmod-yang-module-versioning/

 

Topics 3-5 are related to the Semver draft:

https://datatracker.ietf.org/doc/draft-ietf-netmod-y= ang-semver

 

As before, we will send materials before the meeting= .

 

Rgds,

Jason

 

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Tue, 12 Jan 2021 18:42:32 +0000 From: "Sterne, Jason (Nokia - CA/Ottawa)" To: "netmod@ietf.org" Thread-Topic: YANG Versioning Weekly Call Minutes - 2021-01-12 Thread-Index: AdbpEaS4Z8wSJsYoSp2jPnD4I9K8QQ== Date: Tue, 12 Jan 2021 18:42:32 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: ietf.org; dkim=none (message not signed) header.d=none;ietf.org; dmarc=none action=none header.from=nokia.com; x-originating-ip: [2607:fea8:e324:8d00:f965:4ae3:4b56:123b] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 7d4a956f-31cc-4e95-fc93-08d8b729d23c x-ms-traffictypediagnostic: DM5PR08MB2379: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:8882; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: wzK1kaFytkAg7kPSKwWmCc3MFtBQ07paOSyiZkjZDQDiDVBIToglgIx1q15kXqRFdI9WPMcGs3o80YIgmucMU2dlBrdRLjSax2bs3xIwCX1Vpb9GjVxAdeBGOQUxMcn7wk/wsSrF+iN/uya27N0LBJgiwEDRQsPaDMlhw4G2YIpEQ98TPr3iNzQL8q6I/RrFCClhrtgAzqabYiik4Ku0fMHc0KfDus9GuKQmTa8KZQmU7ZjNRk08oE/i/zgiAlYapSixET2CtiDFWPEArm3lSv0Hte2NvjjDuwxH7i+cf4tbOr+BVK4EEq+Qgm8PLUp8o6a4B2KcpQw6ZVEmxYfHKZ+Lsh8fBSgmsk1Xwk57IU6eP0bDNGVMx9TVVdpeb0I3PwbMp18RlTqmu9K8tAlXbWtP72v9zED7W3V9VQEuvIY97LoCrFjeuzxztT3Jny5qtLFogXCIIBq64tosBrVtxA== x-forefront-antispam-report: CIP:255.255.255.255; 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boundary="_000_DM6PR08MB5084DE972E2E1763C429300F9BAA0DM6PR08MB5084namp_" MIME-Version: 1.0 X-OriginatorOrg: nokia.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM6PR08MB5084.namprd08.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 7d4a956f-31cc-4e95-fc93-08d8b729d23c X-MS-Exchange-CrossTenant-originalarrivaltime: 12 Jan 2021 18:42:32.0480 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5d471751-9675-428d-917b-70f44f9630b0 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: /HO7Oa8UtLfkFtaCg034+ewOdCH7vIp8cp831TUKlh0+c+Ln4VIylchKnAgv89TchM4keOMwZa9w0BcHMoupyQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR08MB2379 Archived-At: Subject: [netmod] YANG Versioning Weekly Call Minutes - 2021-01-12 X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 12 Jan 2021 18:43:18 -0000 --_000_DM6PR08MB5084DE972E2E1763C429300F9BAA0DM6PR08MB5084namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable YANG Versioning Weekly Call Minutes - 2021-01-12 Topics and owners for Feb virtual interim: Reshad - editor for YANG versioning draft Jason - coordinate virtual interim, agenda. Do introduction at VI. T1) Definition/meaning of BC vs NBC for config false nodes https://github.com/netmod-wg/yang-ver-dt/issues/15 - Balazs T2) IANA considerations: how are final RFC revision labels assigned ? https://github.com/netmod-wg/yang-ver-dt/issues/59 - Rob T3) YANG file naming when revision labels are being used (symbolic links? @= ) ? - Reshad to prepare material, TBD to present/lead at VI T4) SemVer: gaps in history, removing revision statements https://github.com/netmod-wg/yang-ver-dt/issues/61 - Joe We spent most of the time discussing Balazs' rules for backwards compatibil= ity of config false nodes (T1 above): - clients SHOULD be able to deal with (not crash) unexpected output - some changes to config false nodes should be BC (increasing value space w= ithin the same type), some will be NBC (e.g. removing mandatory, changing t= ype) - the YANG author can mark a change that increases value space as NBC if th= ey feel it is significant & breaks compatibility We also talked briefly about Rob's proposal for IANA considerations (T2 abo= ve). - we may also want some guidance for RFC editors (coordinate with authors o= n final SemVer for example) Next week we'll continue focus on the four Virtual Interim topics. Other topics we need to get back to at some point: - whitespace - github issues (left off at #15) Jason --_000_DM6PR08MB5084DE972E2E1763C429300F9BAA0DM6PR08MB5084namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

YANG Versioning Weekly Call Minutes - 2021-01-12

 

Topics and owners for Feb virtual interim:

 

Reshad - editor for YAN= G versioning draft

Jason - coordinate virt= ual interim, agenda. Do introduction at VI.

 

T1) Definition/meaning = of BC vs NBC for config false nodes

https://github.com/netm= od-wg/yang-ver-dt/issues/15

- Balazs

 

T2) IANA considerations= : how are final RFC revision labels assigned ?

https://github.com/netm= od-wg/yang-ver-dt/issues/59

- Rob

 

T3) YANG file naming wh= en revision labels are being used (symbolic links? @<revision-label>)= ?

- Reshad to prepare mat= erial, TBD to present/lead at VI

 

T4) SemVer: gaps in his= tory, removing revision statements

https://github.com/netm= od-wg/yang-ver-dt/issues/61

- Joe

 

We spent most of the time discussing Balazs' rules f= or backwards compatibility of config false nodes (T1 above):

- clients SHOULD be able to deal with (not crash) un= expected output

- some changes to config false nodes should be BC (i= ncreasing value space within the same type), some will be NBC (e.g. removin= g mandatory, changing type)

- the YANG author can mark a change that increases v= alue space as NBC if they feel it is significant & breaks compatibility=

 

We also talked briefly about Rob's proposal for IANA= considerations (T2 above).

- we may also want some guidance for RFC editors (co= ordinate with authors on final SemVer for example)

 

Next week we'll continue focus on the four Virtual I= nterim topics.

 

Other topics we need to get back to at some point:

- whitespace

- github issues (left off at #15)

 

Jason

 

--_000_DM6PR08MB5084DE972E2E1763C429300F9BAA0DM6PR08MB5084namp_-- From nobody Thu Jan 14 14:44:02 2021 Return-Path: X-Original-To: netmod@ietf.org Delivered-To: netmod@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id BCC733A1432; Thu, 14 Jan 2021 14:43:56 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: IESG Secretary To: "IETF-Announce" Cc: netmod@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.24.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <161066423665.31950.4445093223290915581@ietfa.amsl.com> Date: Thu, 14 Jan 2021 14:43:56 -0800 Archived-At: Subject: [netmod] Network Modeling (netmod) WG Virtual Meeting: 2021-02-01 X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 14 Jan 2021 22:43:57 -0000 The Network Modeling (netmod) WG will hold a virtual interim meeting on 2021-02-01 from 10:30 to 12:00 America/New_York (15:30 to 17:00 UTC). Agenda: NETMOD Agenda for Interim (virtual) Date February 1, 2021 Start Time 14:30 UTC Duration 90 minutes Time Zone Converter: https://www.timeanddate.com/worldclock/converter.html?iso=20210201T143000&p1=1440&p2=37&p3=438&p4=33&p5=248&p6=224&p7=179 Slides: https://datatracker.ietf.org/meeting/interim-2021-netmod-01/session/netmodNotes Notes & BlueSheet: https://codimd.ietf.org/notes-ietf-interim-2021-netmod-01-netmod WebEx: https://ietf.webex.com/ietf/j.php?MTID=m8ee8976e972cc17b725f3ce1900b0cd0  Jabber: xmpp:netmod@jabber.ietf.org?join Agenda: 1 Topic Intro & Administrivia Presenter: Chairs 2 Topic Module Versioning: Presenter: Authors Follow on to https://datatracker.ietf.org/meeting/interim-2020-netmod-03/session/netmod Virtual Bluesheet Information about remote participation: https://ietf.webex.com/ietf/j.php?MTID=m8ee8976e972cc17b725f3ce1900b0cd0 From nobody Fri Jan 15 08:22:53 2021 Return-Path: X-Original-To: netmod@ietf.org Delivered-To: netmod@ietfa.amsl.com Received: from ietfa.amsl.com (localhost [IPv6:::1]) by ietfa.amsl.com (Postfix) with ESMTP id 7D9123A0C9C; Fri, 15 Jan 2021 08:22:47 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit From: IESG Secretary To: "IETF-Announce" Cc: netmod@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.24.0 Auto-Submitted: auto-generated Precedence: bulk Message-ID: <161072776741.29590.13830234810493226103@ietfa.amsl.com> Date: Fri, 15 Jan 2021 08:22:47 -0800 Archived-At: Subject: [netmod] Network Modeling (netmod) WG Virtual Meeting: 2021-02-01 CHANGED X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 15 Jan 2021 16:22:48 -0000 MEETING DETAILS HAVE CHANGED. SEE LATEST DETAILS BELOW. The Network Modeling (netmod) WG will hold a virtual interim meeting on 2021-02-01 from 09:30 to 11:00 America/New_York (14:30 to 16:00 UTC). Agenda: NETMOD Agenda for Interim (virtual) Date February 1, 2021 Start Time 14:30 UTC Duration 90 minutes Time Zone Converter: https://www.timeanddate.com/worldclock/converter.html?iso=20210201T143000&p1=1440&p2=37&p3=438&p4=33&p5=248&p6=224&p7=179 Slides: https://datatracker.ietf.org/meeting/interim-2021-netmod-01/session/netmodNotes Notes & BlueSheet: https://codimd.ietf.org/notes-ietf-interim-2021-netmod-01-netmod WebEx: https://ietf.webex.com/ietf/j.php?MTID=m8ee8976e972cc17b725f3ce1900b0cd0  Jabber: xmpp:netmod@jabber.ietf.org?join Agenda: 1 Topic Intro & Administrivia Presenter: Chairs 2 Topic Module Versioning: Presenter: Authors Follow on to https://datatracker.ietf.org/meeting/interim-2020-netmod-03/session/netmod Virtual Bluesheet Information about remote participation: https://ietf.webex.com/ietf/j.php?MTID=m8ee8976e972cc17b725f3ce1900b0cd0 From nobody Fri Jan 15 08:31:51 2021 Return-Path: X-Original-To: netmod@ietfa.amsl.com Delivered-To: netmod@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 8FB253A0CE0 for ; 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Mon, 18 Jan 2021 14:08:22 -0800 (PST) MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit From: internet-drafts@ietf.org To: Cc: netmod@ietf.org X-Test-IDTracker: no X-IETF-IDTracker: 7.24.0 Auto-Submitted: auto-generated Precedence: bulk Reply-To: netmod@ietf.org Message-ID: <161100770222.25746.4414271883591983954@ietfa.amsl.com> Date: Mon, 18 Jan 2021 14:08:22 -0800 Archived-At: Subject: [netmod] I-D Action: draft-ietf-netmod-eca-policy-00.txt X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 18 Jan 2021 22:08:22 -0000 A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Network Modeling WG of the IETF. Title : A YANG Data model for ECA Policy Management Authors : Qin Wu Igor Bryskin Henk Birkholz Xufeng Liu Benoit Claise Filename : draft-ietf-netmod-eca-policy-00.txt Pages : 54 Date : 2020-12-22 Abstract: This document defines a YANG data model for Event Condition Action (ECA) policy management. The ECA policy YANG module provides the ability to delegate some network management functions to the server which can take simple and instant action when a trigger condition on the system state is met. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-netmod-eca-policy/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-netmod-eca-policy-00 https://datatracker.ietf.org/doc/html/draft-ietf-netmod-eca-policy-00 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. 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Tue, 19 Jan 2021 15:23:49 +0000 From: "Sterne, Jason (Nokia - CA/Ottawa)" To: "netmod@ietf.org" Thread-Topic: YANG Versioning Weekly Call Minutes - 2021-01-19 Thread-Index: Adbudo4BDg5oia0QRSaHyhkOWpD1wQ== Date: Tue, 19 Jan 2021 15:23:49 +0000 Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: ietf.org; dkim=none (message not signed) header.d=none;ietf.org; dmarc=none action=none header.from=nokia.com; x-originating-ip: [2607:fea8:e31f:6800:1981:b0bf:c427:aa21] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 46b2ba78-b38d-4b2b-901b-08d8bc8e38c6 x-ms-traffictypediagnostic: DS7PR08MB6942: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:6790; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255; 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boundary="_000_DM6PR08MB5084A6146FD766542349E8249BA39DM6PR08MB5084namp_" MIME-Version: 1.0 X-OriginatorOrg: nokia.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: DM6PR08MB5084.namprd08.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 46b2ba78-b38d-4b2b-901b-08d8bc8e38c6 X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Jan 2021 15:23:49.6220 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 5d471751-9675-428d-917b-70f44f9630b0 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: lM0K6cnZwoSMkE1qXdwYsbYEBYTqOZqdPtlSUc2VQl8pnPaJWkesLmEOgLD3jdFruSUy7B1ZTjrRyz1rgUaaOg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR08MB6942 Archived-At: Subject: [netmod] YANG Versioning Weekly Call Minutes - 2021-01-19 X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 19 Jan 2021 15:23:54 -0000 --_000_DM6PR08MB5084A6146FD766542349E8249BA39DM6PR08MB5084namp_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable YANG Versioning Weekly Call Minutes - 2021-01-19 We discussed the Feb Virtual Interim topics T3: (filenames) - introduce a new optional filename format module-name#.yan= g. e.g. acme-module#3.0.1.yang (in parallel with the current optional for= mat acme-module@2020-12-12.yang) - avoid mentioning symlinks. That is outside the scope of our specification= s. T2: (IANA considerations) - we will propose text for enum & identity handling for IANA-maintained mod= ules - Rob to raise a separate issue for versioning handling in RFC Editor guide= lines T1: (NBC rules for state) - still open debate on fundamental principles (mandatory, value space chang= es, removing leafs) Jason --_000_DM6PR08MB5084A6146FD766542349E8249BA39DM6PR08MB5084namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

YANG Versioning Weekly Call Minutes - 2021-01-19

 

We discussed the Feb Virtual Interim topics

 

T3: (filenames)

- introduce a new optional filename format module-na= me#<revision-label>.yang.  e.g. acme-module#3.0.1.yang  (in= parallel with the current optional format acme-module@2020-12-12.yang)

- avoid mentioning symlinks. That is outside the sco= pe of our specifications.

 

T2: (IANA considerations)

- we will propose text for enum & identity handl= ing for IANA-maintained modules

- Rob to raise a separate issue for versioning handl= ing in RFC Editor guidelines

 

T1: (NBC rules for state)

- still open debate on fundamental principles (manda= tory, value space changes, removing leafs)

 

Jason

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charset="gb2312" Content-Transfer-Encoding: base64 MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [netmod] RFC 8808 (reset to factory defaults) versus RFC 8342 (NMDA) X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 Jan 2021 01:35:31 -0000 SSB0aGluayBKdWVyZ2VuIGlzIGNvcnJlY3QuIEEgZmV3IHRob3VnaHRzIG9uIHRoaXM6DQoxLiBG YWN0b3J5IGRlZmF1bHQgZGF0YXN0b3JlIGhhcyBub3RoaW5nIHRvIGRvIHdpdGggZGVmYXVsdCBk YXRhIGhhbmRsaW5nIG9yIHN5c3RlbSBkYXRhIGhhbmRsaW5nLCBmb3IgZGVmYXVsdCBkYXRhIGhh bmRsaW5nLCBwbGVhc2UgcmVmZXIgdG8gUkZDNjI0MywgZm9yIHN5c3RlbSBkYXRhIGhhbmRsaW5n LCB0aGVyZSBpcyBvbmUgb24gZ29pbmcgaW5kaXZpZHVhbCB3b3JrIGluIG5ldGNvbmYgV0cNCmh0 dHBzOi8vdG9vbHMuaWV0Zi5vcmcvaHRtbC9kcmFmdC1tYS1uZXRjb25mLXdpdGgtc3lzdGVtLTAx IHdoaWNoIHByb3Bvc2UgdG8gZGVmaW5lIGEgc3lzdGVtIGRhdGEgZGF0YXN0b3JlIHRvIHByb3Zp ZGUgY29uc2lzdGVudCBkYXRhIGhhbmRsaW5nIGluIHRoZSBzYW1lIHdheSBhcyBSRkM2MjQzIGRp ZC4NCjIuIERlZmF1bHQgZGF0YSB3aWxsIGJlIHBhcnQgb2YgZGVmaW5pdGlvbiBvZiB5YW5nIG1v ZHVsZXMgYXMgbWV0YWRhdGEsIHNlZSBmaWd1cmUgaW4gdGhlIHNlY3Rpb24gMy4xIG9mIFJGQzYy NDQNCjMuIERlZmF1bHQgc3RhdGVtZW50IGlzIGRlZmluZWQgaW4gUkZDNzk1MCwgaXQgY2FuIGJl IHVzZWQgd2l0aCBtYW55IFlBTkcgZGF0YSBub2RlcywgZS5nLiwgbGVhZiwgbGVhZi1saXN0LCBj aG9pY2UuDQotLS0tLdPKvP7Urbz+LS0tLS0NCreivP7IyzogbmV0bW9kIFttYWlsdG86bmV0bW9k LWJvdW5jZXNAaWV0Zi5vcmddILT6se0gSnVlcmdlbiBTY2hvZW53YWVsZGVyDQq3osvNyrG85Dog MjAyMMTqMTHUwjfI1SAxOjM0DQrK1bz+yMs6IEJvZ2FlcnQsIEJhcnQgKE5va2lhIC0gQkUvQW50 d2VycCkgPGJhcnQuYm9nYWVydEBub2tpYS5jb20+DQqzrcvNOiBDYXJleSwgVGltb3RoeSAoTm9r aWEgLSBVUykgPHRpbW90aHkuY2FyZXlAbm9raWEuY29tPjsgUGF1d2VscywgTHVkd2lnIChOb2tp YSAtIEJFL0FudHdlcnApIDxsdWR3aWcucGF1d2Vsc0Bub2tpYS5jb20+OyBuZXRtb2RAaWV0Zi5v cmcNCtb3zOI6IFJlOiBbbmV0bW9kXSBSRkMgODgwMiAocmVzZXQgdG8gZmFjdG9yeSBkZWZhdWx0 cykgdmVyc3VzIFJGQyA4MzQyIChOTURBKQ0KDQpPbiBGcmksIE5vdiAwNiwgMjAyMCBhdCAwMzoz MTozNlBNICswMDAwLCBCb2dhZXJ0LCBCYXJ0IChOb2tpYSAtIEJFL0FudHdlcnApIHdyb3RlOg0K PiBIaSwNCj4gDQo+IFdlIGFyZSBhIGxpdHRsZSBjb25mdXNlZCB3aGVuIHJlYWRpbmcgUkZDODgw OCAocmVzZXQgdG8gZmFjdG9yeS1kZWZhdWx0IGRhdGFzdG9yZSkgaW4gcmVsYXRpb24gdG8gdGhl ICJzeXN0ZW0gY29uZmlndXJhdGlvbiIgc291cmNlIGluIGZpZ3VyZSAyIG9mIFJGQzgzNDIuICBX aGVuIGNvcnJlY3RseSB1bmRlcnN0YW5kaW5nIFJGQyA4MzQyLCB0aGUgcnVubmluZyBkYXRhc3Rv cmUgaXMgZW1wdHkgd2hlbiB0aGUgc3lzdGVtIHN0YXJ0cyB1cCBhZnRlciBjb21pbmcgZnJvbSB0 aGUgZmFjdG9yeSwgYW5kICdmYWN0b3J5IGRlZmF1bHQnIGRhdGEgaXMgZW50ZXJlZCBpbiB0aGUg b3BlcmF0aW9uYWwgZGF0YXN0b3JlIGFzICdzeXN0ZW0vZGVmYXVsdCBjb25maWd1cmF0aW9uJyBk YXRhLg0KPiANCj4gUkZDIDg4MDggc2VlbXMgdG8gc3VnZ2VzdCB0aGF0IHRoZSBydW5uaW5nIGRh dGFzdG9yZSBjb250YWlucyAoZmFjdG9yeS1kZWZhdWx0LCBzeXN0ZW0pIGRhdGEgd2hlbiB0aGUg c3lzdGVtIHN0YXJ0cyB1cCBhZnRlciBjb21pbmcgZnJvbSB0aGUgZmFjdG9yeS4gSS5lLiB0aGUg dW5kZXJzdGFuZGluZyBpcyB0aGF0IGEgcmVzZXQgdG8gZmFjdG9yeSBkZWZhdWx0IGJyaW5ncyB0 aGUgc3lzdGVtIGJhY2sgdG8gdGhlIHN0YXR1cyBhcyBpZiBpdCBjb21lcyBmcm9tIHRoZSBmYWN0 b3J5LCBhbmQgaXQgaXMgc2FpZCB0aGUgZmFjdG9yeSBkZWZhdWx0IGdvZXMgaW50byB0aGUgcnVu bmluZywgLi4uDQo+IA0KPiBXaGF0IGV4YWN0bHkgaXMgdGhlIGNvbnRlbnQgb2YgdGhlIHJ1bm5p bmcgZGF0YXN0b3JlIHdoZW4gaXQgY29tZXMgZnJvbSB0aGUgZmFjdG9yeT8NCj4gQ291bGQgdGhp cyBiZSBjbGFyaWZpZWQ/DQo+DQoNCkkgY29uc2lkZXIgUkZDIDg4MDggYW4gZXh0ZW5zaW9uIHRo YXQgcGVvcGxlIG1heSBpbXBsZW1lbnQgaWYgdGhlaXIgc3lzdGVtcyBkbyB3aGF0IFJGQyA4ODA4 IGRlc2NyaWJlcywgbmFtZWx5IHRoYXQgdGhlIHJ1bm5pbmcgZGF0YXN0b3JlIGlzIGJvb3RzdHJh cHBlZCBmcm9tIGEgZmFjdG9yeSBkZWZhdWx0IGRhdGFzdG9yZS4gKE9mIGNvdXJzZSwgYSBzeXN0 ZW0gd2l0aCBhbiBlbXB0eSBydW5uaW5nIGRhdGFzdG9yZSBhZnRlciBhIGZhY3RvcnkgcmVzZXQg bWF5IGNsYWltIHRvIGJlIGJvb3RzdHJhcHBlZCBmcm9tIGFuIGVtcHR5IGZhY3RvcnkgZGVmYXVs dCBkYXRhc3RvcmUuKQ0KDQpJbiBvdGhlciB3b3JkcywgSSB0aGluayB0aGUgYW5zd2VyIHRvICJX aGF0IGV4YWN0bHkgaXMgdGhlIGNvbnRlbnQgb2YgdGhlIHJ1bm5pbmcgZGF0YXN0b3JlIHdoZW4g aXQgY29tZXMgZnJvbSB0aGUgZmFjdG9yeT8iIGlzIHRoYXQgaXQgaXMgZW1wdHkuIE9uIGZpcnN0 IGJvb3QsIG9uIGEgc3lzdGVtIGltcGxlbWVudGluZyBSRkMgODgwOCwgaXQgd291bGQgYmUgbG9h ZGVkIHdpdGggdGhlIGNvbnRlbnQgb2YgdGhlIGZhY3RvcnkgZGVmYXVsdCBkYXRhc3RvcmUgYW5k IG9uIHN5c3RlbXMgbm90IGltcGxlbWVudGluZyBSRkMgODgwOCBpdCB3b3VsZCBtb3N0IGxpa2Vs eSByZW1haW4gZW1wdHkuDQoNCi9qcw0KDQotLSANCkp1ZXJnZW4gU2Nob2Vud2FlbGRlciAgICAg ICAgICAgSmFjb2JzIFVuaXZlcnNpdHkgQnJlbWVuIGdHbWJIDQpQaG9uZTogKzQ5IDQyMSAyMDAg MzU4NyAgICAgICAgIENhbXB1cyBSaW5nIDEgfCAyODc1OSBCcmVtZW4gfCBHZXJtYW55DQpGYXg6 ICAgKzQ5IDQyMSAyMDAgMzEwMyAgICAgICAgIDxodHRwczovL3d3dy5qYWNvYnMtdW5pdmVyc2l0 eS5kZS8+DQoNCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f DQpuZXRtb2QgbWFpbGluZyBsaXN0DQpuZXRtb2RAaWV0Zi5vcmcNCmh0dHBzOi8vd3d3LmlldGYu b3JnL21haWxtYW4vbGlzdGluZm8vbmV0bW9kDQo= From nobody Wed Jan 20 00:57:55 2021 Return-Path: X-Original-To: netmod@ietfa.amsl.com Delivered-To: netmod@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0DE423A0CD9 for ; Wed, 20 Jan 2021 00:57:53 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, HTML_MESSAGE=0.001, RCVD_IN_DNSWL_BLOCKED=0.001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id M96P8dq2iB2s for ; Wed, 20 Jan 2021 00:57:51 -0800 (PST) Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id A9ACC3A0CD6 for ; Wed, 20 Jan 2021 00:57:50 -0800 (PST) Received: from fraeml709-chm.china.huawei.com (unknown [172.18.147.201]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4DLK8b4Y2Tz67f57 for ; Wed, 20 Jan 2021 16:54:39 +0800 (CST) Received: from fraeml715-chm.china.huawei.com (10.206.15.34) by fraeml709-chm.china.huawei.com (10.206.15.37) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2106.2; Wed, 20 Jan 2021 09:57:48 +0100 Received: from fraeml715-chm.china.huawei.com ([10.206.15.34]) by fraeml715-chm.china.huawei.com ([10.206.15.34]) with mapi id 15.01.2106.006; Wed, 20 Jan 2021 09:57:48 +0100 From: Italo Busi To: "'netmod@ietf.org'" Thread-Topic: Questions about how to assign default values with YANG Thread-Index: AdbvCmZgzen+a6G4QWicT/glaRAynA== Date: Wed, 20 Jan 2021 08:57:48 +0000 Message-ID: Accept-Language: it-IT, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.47.81.4] Content-Type: multipart/alternative; boundary="_000_a0c43ab5c3c1463a97a1aa594a80ceeehuaweicom_" MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: [netmod] Questions about how to assign default values with YANG X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 Jan 2021 08:57:53 -0000 --_000_a0c43ab5c3c1463a97a1aa594a80ceeehuaweicom_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi all, I have read RFC7950 and RFC8342 but I have still some questions for clarifi= cation about how to deal with default values in YANG. Let's consider a config true leaf for which a YANG default statement has be= en defined in the YANG module. If the client does not configure that leaf in the running datastore, the le= af is not present (cannot be read) in the running datastore. The default value for that leaf is assigned by server in the operational da= tastore as part of the applied configuration (assuming that other configura= tions do not override it). If that leaf exists in the operational datastore, the server shall return t= he default value if that leaf is read. Is our understanding correct? Is it possible for a server not to use that leaf and not to return any valu= e if that leaf is read? According to this text from RFC8342, it seems that this is possible: Requests to retrieve nodes from always return the value in use if the node exists, regardless of any default value specified in the YANG module. If no value is returned for a given node, then this implies that the node is not used by the device. However, according to this text from RFC7950, it seems that this is not pos= sible: When the default value is in use, the server MUST operationally behave as if the leaf was present in the data tree with the default value as its value. There are case where the default value to assign to a leaf depends on the c= onfiguration of other leaves. In this case, the default value cannot be def= ined using a YANG default statement. In this case, is it possible in this case to define the default value in th= e description (maybe referencing some other standard specification)? Would the behavior of the system be exactly the same as in the cases where = the default value is assigned using a YANG default statement? Would it be possible in this case to define a default value for a leaf defi= ned in a base model which depends on an attribute defined in another model = which augments the base model? In this case, the description of the leaf in the base model cannot be chang= ed in the augmented model. Should the default value for the leaf defined in= the base model be described in the description for the leaf defined in the= augmenting module? For example, would this YANG be valid/correct to define a default value 10 = for the leaf foo when the leaf bar exist? module example-base { container example { leaf foo { type uint8; } } } module example-augment { import example { prefix ex; } augment "ex:example" { leaf bar { type empty; description "When present, the default value for foo is 10."; } } } Thanks for your help Italo --_000_a0c43ab5c3c1463a97a1aa594a80ceeehuaweicom_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Hi all,

 

I have read RFC7950 and RFC8342 but I have still som= e questions for clarification about how to deal with default values in YANG= .

 

Let's consider a config true leaf for which a YANG d= efault statement has been defined in the YANG module.

 

If the client does not configure that leaf in the ru= nning datastore, the leaf is not present (cannot be read) in the running da= tastore.

 

The default value for that leaf is assigned by serve= r in the operational datastore as part of the applied configuration (assumi= ng that other configurations do not override it).

 

If that leaf exists in the operational datastore, th= e server shall return the default value if that leaf is read.

 

Is our understanding correct?

 

Is it possible for a server not to use that leaf and= not to return any value if that leaf is read?

 

According to this text from RFC8342, it seems that t= his is possible:

 

   Requests to retrieve nodes from <ope= rational> always return the value

   in use if the node exists, regardless o= f any default value specified

   in the YANG module.  If no value i= s returned for a given node, then

   this implies that the node is not used = by the device.

 

However, according to this text from RFC7950, it see= ms that this is not possible:

 

   When the default value is in use, the s= erver MUST operationally

   behave as if the leaf was present in th= e data tree with the default

   value as its value.

There are case where the default value to assign to = a leaf depends on the configuration of other leaves. In this case, the defa= ult value cannot be defined using a YANG default statement.

 

In this case, is it possible in this case to define = the default value in the description (maybe referencing some other standard= specification)?

Would the behavior of the system be exactly the same= as in the cases where the default value is assigned using a YANG default s= tatement?

Would it be possible in this case to define a defaul= t value for a leaf defined in a base model which depends on an attribute de= fined in another model which augments the base model?

In this case, the description of the leaf in the bas= e model cannot be changed in the augmented model. Should the default value = for the leaf defined in the base model be described in the description for = the leaf defined in the augmenting module?

 

For example, would this YANG be valid/correct to def= ine a default value 10 for the leaf foo when the leaf bar exist?=

 

module&nbs= p;example-base {

 &nbs= p;container example {

 &nbs= p;  leaf foo {

 &nbs= p;    type uint8;

 &nbs= p;  }

 &nbs= p;}

}

 = ;

module&nbs= p;example-augment {

 &nbs= p;import example {

 &nbs= p;  prefix ex;

 &nbs= p;}

 = ;

 &nbs= p;augment "ex:example" {

 &nbs= p;  leaf bar {

 &nbs= p;    type empty;

 &nbs= p;    description

 &nbs= p;      "When present, the&nbs= p;default value for foo is 10.";

 &nbs= p;  }

 &nbs= p;}

}

 = ;

 

Thanks for your help

 

Italo

 

--_000_a0c43ab5c3c1463a97a1aa594a80ceeehuaweicom_-- From nobody Wed Jan 20 01:47:44 2021 Return-Path: X-Original-To: netmod@ietfa.amsl.com Delivered-To: netmod@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0BAE23A0E1C for ; Wed, 20 Jan 2021 01:47:44 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 0j3567lPXgRi for ; Wed, 20 Jan 2021 01:47:41 -0800 (PST) Received: from atlas5.jacobs-university.de (atlas5.jacobs-university.de [212.201.44.20]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 7C9093A0E1D for ; Wed, 20 Jan 2021 01:47:40 -0800 (PST) Received: from localhost (demetrius5.irc-it.jacobs-university.de [10.70.0.222]) by atlas5.jacobs-university.de (Postfix) with ESMTP id E7E7FD70; Wed, 20 Jan 2021 10:47:38 +0100 (CET) X-Virus-Scanned: amavisd-new at jacobs-university.de Received: from atlas5.jacobs-university.de ([10.70.0.198]) by localhost (demetrius5.jacobs-university.de [10.70.0.222]) (amavisd-new, port 10032) with ESMTP id hNSapHXb9xvY; Wed, 20 Jan 2021 10:47:38 +0100 (CET) Received: from hermes.jacobs-university.de (hermes.jacobs-university.de [212.201.44.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "hermes.jacobs-university.de", Issuer "DFN-Verein Global Issuing CA" (verified OK)) by atlas5.jacobs-university.de (Postfix) with ESMTPS; Wed, 20 Jan 2021 10:47:38 +0100 (CET) Received: from localhost (demetrius5.irc-it.jacobs-university.de [10.70.0.222]) by hermes.jacobs-university.de (Postfix) with ESMTP id 8E7B220156; Wed, 20 Jan 2021 10:47:38 +0100 (CET) X-Virus-Scanned: amavisd-new at jacobs-university.de Received: from hermes.jacobs-university.de ([212.201.44.23]) by localhost (demetrius5.jacobs-university.de [10.70.0.222]) (amavisd-new, port 10028) with ESMTP id tu3mPc_ZpJBn; Wed, 20 Jan 2021 10:47:38 +0100 (CET) Received: from localhost (anna.jacobs.jacobs-university.de [10.50.218.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by hermes.jacobs-university.de (Postfix) with ESMTPS id EECE120154; Wed, 20 Jan 2021 10:47:37 +0100 (CET) Date: Wed, 20 Jan 2021 10:47:37 +0100 From: Juergen Schoenwaelder To: Italo Busi Cc: "'netmod@ietf.org'" Message-ID: <20210120094737.g5l5pvfzligahrj6@anna.jacobs.jacobs-university.de> Reply-To: Juergen Schoenwaelder Mail-Followup-To: Italo Busi , "'netmod@ietf.org'" References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Archived-At: Subject: Re: [netmod] Questions about how to assign default values with YANG X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 Jan 2021 09:47:44 -0000 On Wed, Jan 20, 2021 at 08:57:48AM +0000, Italo Busi wrote: > Hi all, > > I have read RFC7950 and RFC8342 but I have still some questions for clarification about how to deal with default values in YANG. > > Let's consider a config true leaf for which a YANG default statement has been defined in the YANG module. > > If the client does not configure that leaf in the running datastore, the leaf is not present (cannot be read) in the running datastore. > > The default value for that leaf is assigned by server in the operational datastore as part of the applied configuration (assuming that other configurations do not override it). > > If that leaf exists in the operational datastore, the server shall return the default value if that leaf is read. > > Is our understanding correct? Yes. And you would tag the value with or:origin="or:default", appendix C.1 in RFC 8342 is a good example. > Is it possible for a server not to use that leaf and not to return any value if that leaf is read? > > According to this text from RFC8342, it seems that this is possible: > > Requests to retrieve nodes from always return the value > in use if the node exists, regardless of any default value specified > in the YANG module. If no value is returned for a given node, then > this implies that the node is not used by the device. > > However, according to this text from RFC7950, it seems that this is not possible: > > When the default value is in use, the server MUST operationally > behave as if the leaf was present in the data tree with the default > value as its value. I do not see the conflict. Note that RFC 7950 predates the notion of an operational datastore. > There are case where the default value to assign to a leaf depends on the configuration of other leaves. In this case, the default value cannot be defined using a YANG default statement. > > In this case, is it possible in this case to define the default value in the description (maybe referencing some other standard specification)? > > Would the behavior of the system be exactly the same as in the cases where the default value is assigned using a YANG default statement? RFC 8342 says: o default: represents configuration using a default value specified in the data model, using either values in the "default" statement or any values described in the "description" statement. The default origin is only used when the configuration has not been provided by any other source. and identity default { base origin; description "Denotes configuration that does not have a configured or learned value but has a default value in use. Covers both values defined in a 'default' statement and values defined via an explanation in a 'description' statement."; } So it is possible to define the default in a description clause. > Would it be possible in this case to define a default value for a leaf defined in a base model which depends on an attribute defined in another model which augments the base model? > In this case, the description of the leaf in the base model cannot be changed in the augmented model. Should the default value for the leaf defined in the base model be described in the description for the leaf defined in the augmenting module? > For example, would this YANG be valid/correct to define a default value 10 for the leaf foo when the leaf bar exist? > > module example-base { > container example { > leaf foo { > type uint8; > } > } > } > > module example-augment { > import example { > prefix ex; > } > > augment "ex:example" { > leaf bar { > type empty; > description > "When present, the default value for foo is 10."; > } > } > } > Well, this may be meaningful in some cases but it is also risky, if multiple augementations start to disagree on what should be the default of some other leaf. Alternatively, you could report the value foo=10 with the origin "system". For most clients, it likely does not matter much whether foo=10 is reported with origin=default or origin=system if the default derivation logic becomes more complex. For me personally, if there is more complex logic involved in deriving a value for a leaf (i.e., the existence of other leafs or values of other leafs matter), then I would rather call it a system provided value and not a default value. /js -- Juergen Schoenwaelder Jacobs University Bremen gGmbH Phone: +49 421 200 3587 Campus Ring 1 | 28759 Bremen | Germany Fax: +49 421 200 3103 From nobody Wed Jan 20 02:51:19 2021 Return-Path: X-Original-To: netmod@ietfa.amsl.com Delivered-To: netmod@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6B4E73A10B0 for ; Wed, 20 Jan 2021 02:51:17 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_DNSWL_BLOCKED=0.001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id c8C6-6zhuIaH for ; Wed, 20 Jan 2021 02:51:15 -0800 (PST) Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 68E6C3A10AB for ; Wed, 20 Jan 2021 02:51:15 -0800 (PST) Received: from fraeml710-chm.china.huawei.com (unknown [172.18.147.200]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4DLMch2qlYz67dBW; Wed, 20 Jan 2021 18:45:40 +0800 (CST) Received: from fraeml715-chm.china.huawei.com (10.206.15.34) by fraeml710-chm.china.huawei.com (10.206.15.59) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2106.2; Wed, 20 Jan 2021 11:51:10 +0100 Received: from fraeml715-chm.china.huawei.com ([10.206.15.34]) by fraeml715-chm.china.huawei.com ([10.206.15.34]) with mapi id 15.01.2106.006; Wed, 20 Jan 2021 11:51:10 +0100 From: Italo Busi To: 'Juergen Schoenwaelder' CC: "'netmod@ietf.org'" Thread-Topic: [netmod] Questions about how to assign default values with YANG Thread-Index: AdbvCmZgzen+a6G4QWicT/glaRAynP///QGA///e3yA= Date: Wed, 20 Jan 2021 10:51:09 +0000 Message-ID: <2384a8f549c94ea0ac46d6c772fbca43@huawei.com> References: <20210120094737.g5l5pvfzligahrj6@anna.jacobs.jacobs-university.de> In-Reply-To: <20210120094737.g5l5pvfzligahrj6@anna.jacobs.jacobs-university.de> Accept-Language: it-IT, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.47.81.4] Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [netmod] Questions about how to assign default values with YANG X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 Jan 2021 10:51:17 -0000 Juergen, Thanks for your quick and clear reply. Thanks also for the suggestion of using system provided values instead of d= efault values. I have only one doubt and one follow-up question: > > Is it possible for a server not to use that leaf and not to return any = value if > that leaf is read? > > > > According to this text from RFC8342, it seems that this is possible: > > > > Requests to retrieve nodes from always return the valu= e > > in use if the node exists, regardless of any default value specified > > in the YANG module. If no value is returned for a given node, then > > this implies that the node is not used by the device. > > > > However, according to this text from RFC7950, it seems that this is not > possible: > > > > When the default value is in use, the server MUST operationally > > behave as if the leaf was present in the data tree with the default > > value as its value. >=20 > I do not see the conflict. Note that RFC 7950 predates the notion of an > operational datastore. > Does it mean that a server may not use/implement in the operational datasto= re a leaf for which a YANG default statement has been defined? What would be the value of defining a YANG default statement for config fa= lse leaf? Italo > -----Original Message----- > From: Juergen Schoenwaelder [mailto:j.schoenwaelder@jacobs-university.de] > Sent: mercoled=EC 20 gennaio 2021 10:48 > To: Italo Busi > Cc: 'netmod@ietf.org' > Subject: Re: [netmod] Questions about how to assign default values with > YANG >=20 > On Wed, Jan 20, 2021 at 08:57:48AM +0000, Italo Busi wrote: > > Hi all, > > > > I have read RFC7950 and RFC8342 but I have still some questions for > clarification about how to deal with default values in YANG. > > > > Let's consider a config true leaf for which a YANG default statement ha= s > been defined in the YANG module. > > > > If the client does not configure that leaf in the running datastore, th= e leaf is > not present (cannot be read) in the running datastore. > > > > The default value for that leaf is assigned by server in the operationa= l > datastore as part of the applied configuration (assuming that other > configurations do not override it). > > > > If that leaf exists in the operational datastore, the server shall retu= rn the > default value if that leaf is read. > > > > Is our understanding correct? >=20 > Yes. And you would tag the value with or:origin=3D"or:default", appendix = C.1 in > RFC 8342 is a good example. >=20 > > Is it possible for a server not to use that leaf and not to return any = value if > that leaf is read? > > > > According to this text from RFC8342, it seems that this is possible: > > > > Requests to retrieve nodes from always return the valu= e > > in use if the node exists, regardless of any default value specified > > in the YANG module. If no value is returned for a given node, then > > this implies that the node is not used by the device. > > > > However, according to this text from RFC7950, it seems that this is not > possible: > > > > When the default value is in use, the server MUST operationally > > behave as if the leaf was present in the data tree with the default > > value as its value. >=20 > I do not see the conflict. Note that RFC 7950 predates the notion of an > operational datastore. >=20 > > There are case where the default value to assign to a leaf depends on t= he > configuration of other leaves. In this case, the default value cannot be = defined > using a YANG default statement. > > > > In this case, is it possible in this case to define the default value i= n the > description (maybe referencing some other standard specification)? > > > > Would the behavior of the system be exactly the same as in the cases wh= ere > the default value is assigned using a YANG default statement? >=20 > RFC 8342 says: >=20 > o default: represents configuration using a default value specified > in the data model, using either values in the "default" statement > or any values described in the "description" statement. The > default origin is only used when the configuration has not been > provided by any other source. >=20 > and >=20 > identity default { > base origin; > description > "Denotes configuration that does not have a configured or > learned value but has a default value in use. Covers both > values defined in a 'default' statement and values defined > via an explanation in a 'description' statement."; > } >=20 > So it is possible to define the default in a description clause. >=20 > > Would it be possible in this case to define a default value for a leaf = defined in > a base model which depends on an attribute defined in another model which > augments the base model? > > In this case, the description of the leaf in the base model cannot be c= hanged > in the augmented model. Should the default value for the leaf defined in = the > base model be described in the description for the leaf defined in the > augmenting module? > > For example, would this YANG be valid/correct to define a default value= 10 > for the leaf foo when the leaf bar exist? > > > > module example-base { > > container example { > > leaf foo { > > type uint8; > > } > > } > > } > > > > module example-augment { > > import example { > > prefix ex; > > } > > > > augment "ex:example" { > > leaf bar { > > type empty; > > description > > "When present, the default value for foo is 10."; > > } > > } > > } > > >=20 > Well, this may be meaningful in some cases but it is also risky, if multi= ple > augementations start to disagree on what should be the default of some ot= her > leaf. Alternatively, you could report the value > foo=3D10 with the origin "system". For most clients, it likely does not m= atter > much whether foo=3D10 is reported with origin=3Ddefault or origin=3Dsyste= m if the > default derivation logic becomes more complex. >=20 > For me personally, if there is more complex logic involved in deriving a = value > for a leaf (i.e., the existence of other leafs or values of other leafs m= atter), then > I would rather call it a system provided value and not a default value. >=20 > /js >=20 > -- > Juergen Schoenwaelder Jacobs University Bremen gGmbH > Phone: +49 421 200 3587 Campus Ring 1 | 28759 Bremen | Germany > Fax: +49 421 200 3103 From nobody Wed Jan 20 03:44:53 2021 Return-Path: X-Original-To: netmod@ietfa.amsl.com Delivered-To: netmod@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 5219E3A114A for ; Wed, 20 Jan 2021 03:44:52 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 20Ra06dKhbiY for ; Wed, 20 Jan 2021 03:44:50 -0800 (PST) Received: from atlas5.jacobs-university.de (atlas5.jacobs-university.de [212.201.44.20]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 6009F3A1149 for ; Wed, 20 Jan 2021 03:44:50 -0800 (PST) Received: from localhost (demetrius5.irc-it.jacobs-university.de [10.70.0.222]) by atlas5.jacobs-university.de (Postfix) with ESMTP id 3636182F; Wed, 20 Jan 2021 12:44:48 +0100 (CET) X-Virus-Scanned: amavisd-new at jacobs-university.de Received: from atlas5.jacobs-university.de ([10.70.0.198]) by localhost (demetrius5.jacobs-university.de [10.70.0.222]) (amavisd-new, port 10032) with ESMTP id 9qiBwKmTf1PE; Wed, 20 Jan 2021 12:44:47 +0100 (CET) Received: from hermes.jacobs-university.de (hermes.jacobs-university.de [212.201.44.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "hermes.jacobs-university.de", Issuer "DFN-Verein Global Issuing CA" (verified OK)) by atlas5.jacobs-university.de (Postfix) with ESMTPS; Wed, 20 Jan 2021 12:44:47 +0100 (CET) Received: from localhost (demetrius5.irc-it.jacobs-university.de [10.70.0.222]) by hermes.jacobs-university.de (Postfix) with ESMTP id CBD7820156; Wed, 20 Jan 2021 12:44:47 +0100 (CET) X-Virus-Scanned: amavisd-new at jacobs-university.de Received: from hermes.jacobs-university.de ([212.201.44.23]) by localhost (demetrius5.jacobs-university.de [10.70.0.222]) (amavisd-new, port 10028) with ESMTP id o4o-dz-FSp_h; Wed, 20 Jan 2021 12:44:47 +0100 (CET) Received: from localhost (anna.jacobs.jacobs-university.de [10.50.218.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by hermes.jacobs-university.de (Postfix) with ESMTPS id 31C5320154; Wed, 20 Jan 2021 12:44:46 +0100 (CET) Date: Wed, 20 Jan 2021 12:44:46 +0100 From: Juergen Schoenwaelder To: Italo Busi Cc: "'netmod@ietf.org'" Message-ID: <20210120114446.ovih63db7vmv7c7s@anna.jacobs.jacobs-university.de> Reply-To: Juergen Schoenwaelder Mail-Followup-To: Italo Busi , "'netmod@ietf.org'" References: <20210120094737.g5l5pvfzligahrj6@anna.jacobs.jacobs-university.de> <2384a8f549c94ea0ac46d6c772fbca43@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <2384a8f549c94ea0ac46d6c772fbca43@huawei.com> Archived-At: Subject: Re: [netmod] Questions about how to assign default values with YANG X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 Jan 2021 11:44:52 -0000 On Wed, Jan 20, 2021 at 10:51:09AM +0000, Italo Busi wrote: > > Does it mean that a server may not use/implement in the operational datastore a leaf for which a YANG default statement has been defined? > RFC 7950 section 7.6.1 mentions describes situations where a leaf is conditional, i.e., there is when condition or an if-feature expression or the leaf is a case node. > What would be the value of defining a YANG default statement for config false leaf? > Technically, this can happen because a type has a defined default value and this type may be used by config false leafs. An example is the zero-based-counter32 typedef in RFC 6991. However, this style may be debated since it (mis)uses a default statement to define an initial value. I am not sure whether the pattern of using default statements for specifying intial values is a good one. /js -- Juergen Schoenwaelder Jacobs University Bremen gGmbH Phone: +49 421 200 3587 Campus Ring 1 | 28759 Bremen | Germany Fax: +49 421 200 3103 From nobody Wed Jan 20 06:41:45 2021 Return-Path: X-Original-To: netmod@ietfa.amsl.com Delivered-To: netmod@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id B87213A1443 for ; Wed, 20 Jan 2021 06:41:43 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.9 X-Spam-Level: X-Spam-Status: No, score=-1.9 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Fc-dlQGSz230 for ; Wed, 20 Jan 2021 06:41:41 -0800 (PST) Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id C57823A143D for ; Wed, 20 Jan 2021 06:41:41 -0800 (PST) Received: from fraeml711-chm.china.huawei.com (unknown [172.18.147.200]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4DLSnL3PKfz67dKf; Wed, 20 Jan 2021 22:38:30 +0800 (CST) Received: from fraeml715-chm.china.huawei.com (10.206.15.34) by fraeml711-chm.china.huawei.com (10.206.15.60) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2106.2; Wed, 20 Jan 2021 15:41:39 +0100 Received: from fraeml715-chm.china.huawei.com ([10.206.15.34]) by fraeml715-chm.china.huawei.com ([10.206.15.34]) with mapi id 15.01.2106.006; Wed, 20 Jan 2021 15:41:39 +0100 From: Italo Busi To: 'Juergen Schoenwaelder' CC: "'netmod@ietf.org'" Thread-Topic: [netmod] Questions about how to assign default values with YANG Thread-Index: AdbvCmZgzen+a6G4QWicT/glaRAynP///QGA///e3yCAAEHcAP//waGg Date: Wed, 20 Jan 2021 14:41:39 +0000 Message-ID: <0ed5638881af42148720dd7f4843c3e6@huawei.com> References: <20210120094737.g5l5pvfzligahrj6@anna.jacobs.jacobs-university.de> <2384a8f549c94ea0ac46d6c772fbca43@huawei.com> <20210120114446.ovih63db7vmv7c7s@anna.jacobs.jacobs-university.de> In-Reply-To: <20210120114446.ovih63db7vmv7c7s@anna.jacobs.jacobs-university.de> Accept-Language: it-IT, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.47.27.133] Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-CFilter-Loop: Reflected Archived-At: Subject: Re: [netmod] Questions about how to assign default values with YANG X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 Jan 2021 14:41:44 -0000 Thanks again Juergen, This was really helpful I still have one doubt: > > Does it mean that a server may not use/implement in the operational > datastore a leaf for which a YANG default statement has been defined? > > >=20 > RFC 7950 section 7.6.1 mentions describes situations where a leaf is > conditional, i.e., there is when condition or an if-feature expression or= the leaf > is a case node. > What about the case the leaf is not conditional (but still mandatory false = since a YANG default statement is defined)? May the server still decide not to use/implement this leaf in the operation= al datastore? For example, in appendix C.1 of RFC8342, auto-negotiation is enabled by def= ault. What should be the behavior of a system which does not implement auto-negot= iation? Return the value false or no value (in the operational datastore)? Italo > -----Original Message----- > From: Juergen Schoenwaelder [mailto:j.schoenwaelder@jacobs-university.de] > Sent: mercoled=EC 20 gennaio 2021 12:45 > To: Italo Busi > Cc: 'netmod@ietf.org' > Subject: Re: [netmod] Questions about how to assign default values with > YANG >=20 > On Wed, Jan 20, 2021 at 10:51:09AM +0000, Italo Busi wrote: > > > > Does it mean that a server may not use/implement in the operational > datastore a leaf for which a YANG default statement has been defined? > > >=20 > RFC 7950 section 7.6.1 mentions describes situations where a leaf is > conditional, i.e., there is when condition or an if-feature expression or= the leaf > is a case node. >=20 > > What would be the value of defining a YANG default statement for confi= g > false leaf? > > >=20 > Technically, this can happen because a type has a defined default value a= nd > this type may be used by config false leafs. >=20 > An example is the zero-based-counter32 typedef in RFC 6991. However, this > style may be debated since it (mis)uses a default statement to define an = initial > value. I am not sure whether the pattern of using default statements for > specifying intial values is a good one. >=20 > /js >=20 > -- > Juergen Schoenwaelder Jacobs University Bremen gGmbH > Phone: +49 421 200 3587 Campus Ring 1 | 28759 Bremen | Germany > Fax: +49 421 200 3103 From nobody Wed Jan 20 08:05:25 2021 Return-Path: X-Original-To: netmod@ietfa.amsl.com Delivered-To: netmod@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id D64243A14B2 for ; Wed, 20 Jan 2021 08:05:23 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.899 X-Spam-Level: X-Spam-Status: No, score=-1.899 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id rhHN6g_1uBMB for ; Wed, 20 Jan 2021 08:05:21 -0800 (PST) Received: from atlas5.jacobs-university.de (atlas5.jacobs-university.de [212.201.44.20]) (using TLSv1.2 with cipher ADH-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 067C93A14AC for ; Wed, 20 Jan 2021 08:05:20 -0800 (PST) Received: from localhost (demetrius5.irc-it.jacobs-university.de [10.70.0.222]) by atlas5.jacobs-university.de (Postfix) with ESMTP id C2E76D70; Wed, 20 Jan 2021 17:05:18 +0100 (CET) X-Virus-Scanned: amavisd-new at jacobs-university.de Received: from atlas5.jacobs-university.de ([10.70.0.198]) by localhost (demetrius5.jacobs-university.de [10.70.0.222]) (amavisd-new, port 10032) with ESMTP id 6VXIsmAPeJT0; Wed, 20 Jan 2021 17:05:18 +0100 (CET) Received: from hermes.jacobs-university.de (hermes.jacobs-university.de [212.201.44.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "hermes.jacobs-university.de", Issuer "DFN-Verein Global Issuing CA" (verified OK)) by atlas5.jacobs-university.de (Postfix) with ESMTPS; Wed, 20 Jan 2021 17:05:18 +0100 (CET) Received: from localhost (demetrius5.irc-it.jacobs-university.de [10.70.0.222]) by hermes.jacobs-university.de (Postfix) with ESMTP id 6A9BD20156; Wed, 20 Jan 2021 17:05:18 +0100 (CET) X-Virus-Scanned: amavisd-new at jacobs-university.de Received: from hermes.jacobs-university.de ([212.201.44.23]) by localhost (demetrius5.jacobs-university.de [10.70.0.222]) (amavisd-new, port 10028) with ESMTP id j2eSeO1tnm5k; Wed, 20 Jan 2021 17:05:18 +0100 (CET) Received: from localhost (anna.jacobs.jacobs-university.de [10.50.218.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by hermes.jacobs-university.de (Postfix) with ESMTPS id B896020154; Wed, 20 Jan 2021 17:05:17 +0100 (CET) Date: Wed, 20 Jan 2021 17:05:17 +0100 From: Juergen Schoenwaelder To: Italo Busi Cc: "'netmod@ietf.org'" Message-ID: <20210120160517.hsg5dnpidvrprtso@anna.jacobs.jacobs-university.de> Reply-To: Juergen Schoenwaelder Mail-Followup-To: Italo Busi , "'netmod@ietf.org'" References: <20210120094737.g5l5pvfzligahrj6@anna.jacobs.jacobs-university.de> <2384a8f549c94ea0ac46d6c772fbca43@huawei.com> <20210120114446.ovih63db7vmv7c7s@anna.jacobs.jacobs-university.de> <0ed5638881af42148720dd7f4843c3e6@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0ed5638881af42148720dd7f4843c3e6@huawei.com> Archived-At: Subject: Re: [netmod] Questions about how to assign default values with YANG X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 Jan 2021 16:05:24 -0000 On Wed, Jan 20, 2021 at 02:41:39PM +0000, Italo Busi wrote: > > What about the case the leaf is not conditional (but still mandatory false since a YANG default statement is defined)? > > May the server still decide not to use/implement this leaf in the operational datastore? > > For example, in appendix C.1 of RFC8342, auto-negotiation is enabled by default. > What should be the behavior of a system which does not implement auto-negotiation? > Return the value false or no value (in the operational datastore)? > Here are some of the rules I personally like: - is the ground truth about what a system has and does - do not implement leafs that do not apply Hence, interfaces supporting auto-negotiation have either auto-negotiation/enabled = true or auto-negotiation/enabled = false in . And interfaces not supporting auto-negotiation have nothing to report about auto-negotiation. Yes, I do not want to see auto-negotiation/enabled = false on a loopback interface. My historic Ethernet interface from the last century would also not report auto-negotiation/enabled in . You may hit applications that love to have auto-negotiation/enabled available on all Ethernet interfaces and then you end in a debate where the application developers tell you that no information in may have many reasons (instrumentation not implemented, access control rules, whatever and by reporting enabled=false you do them a favor) but the true answer in such a debate is often that modeling things as a boolean is simplistic since there are often more than exactly two states (in this case, enabled, disabled, failed, not-available, ...). So you settle on blaming the model writer. ;-) /js -- Juergen Schoenwaelder Jacobs University Bremen gGmbH Phone: +49 421 200 3587 Campus Ring 1 | 28759 Bremen | Germany Fax: +49 421 200 3103 From nobody Wed Jan 20 08:41:28 2021 Return-Path: X-Original-To: netmod@ietfa.amsl.com Delivered-To: netmod@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 490BA3A03FA for ; Wed, 20 Jan 2021 08:41:26 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.901 X-Spam-Level: X-Spam-Status: No, score=-1.901 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_MSPIKE_H2=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=btconnect.onmicrosoft.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id UjeNIzJ0KRWV for ; 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Wed, 20 Jan 2021 16:41:21 +0000 Received: from AM7PR07MB6248.eurprd07.prod.outlook.com ([fe80::6d46:4f3c:643:4849]) by AM7PR07MB6248.eurprd07.prod.outlook.com ([fe80::6d46:4f3c:643:4849%5]) with mapi id 15.20.3763.014; Wed, 20 Jan 2021 16:41:21 +0000 From: tom petch To: "netmod@ietf.org" Thread-Topic: Structuring a DHCP module Thread-Index: AQHW70sVzeGJg/CSikuUFwnormzctQ== Date: Wed, 20 Jan 2021 16:41:21 +0000 Message-ID: References: <161100770222.25746.4414271883591983954@ietfa.amsl.com> In-Reply-To: <161100770222.25746.4414271883591983954@ietfa.amsl.com> Accept-Language: en-GB, en-US Content-Language: en-GB X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: ietf.org; dkim=none (message not signed) header.d=none;ietf.org; dmarc=none action=none header.from=btconnect.com; x-originating-ip: [86.146.121.140] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 72550d9d-ee22-49bb-de43-08d8bd6237d6 x-ms-traffictypediagnostic: AM6PR07MB5108: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; 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charset="Windows-1252" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: btconnect.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: AM7PR07MB6248.eurprd07.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 72550d9d-ee22-49bb-de43-08d8bd6237d6 X-MS-Exchange-CrossTenant-originalarrivaltime: 20 Jan 2021 16:41:21.2555 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: cf8853ed-96e5-465b-9185-806bfe185e30 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: UMfjbtLHlmJSZIfTqLCJ1BXPjRfOYCPIZCAdfhbxRRwrp55HvPBvzJrKEKwnlL2OLuC5ETJjctkZaVSusQUIfA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM6PR07MB5108 Archived-At: Subject: [netmod] Structuring a DHCP module X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 Jan 2021 16:41:26 -0000 Juergen, Lada, Martin, Andy=0A= =0A= I wonder if one of you, or perhaps another on this list, would be willing t= o give advice on the =0A= structuring of the YANG module for DHCP. It has been revised and restruct= ured several times and, to me, is not progressing.=0A= =0A= It models three roles - client, server, relay - and a dozen optional functi= on which can appear in one or more roles. A node will likely have only one= role but may have many options.=0A= =0A= There are, at present, seven modules=0A= server which defines a server identity based on common identity inter alia= =0A= relay which defines relay identity ditto=0A= client which defines client identity ditto=0A= server options which has groupings for each option for a server=0A= client options which has groupings for each option for a relay=0A= relay options which has groupings for each option for a client=0A= common which defines the common identity inter alia=0A= Since options are common across roles, some groupings are replicated in the= three options modules. Three separate option modules were created to avoi= d problems with imports as Ian explains below. The I-D is draft-ietf-dhc-d= hcpv6-yang=0A= =0A= My take is that one module is best, using 'when' or if-feature to select, w= hich is what I see with OSPF, PCE, TCP, IGMP and almost everything else but= am struggling to convince others, especially the author Ian. [IF] in the= e-mail extract below=0A= =0A= I suggested asking a YANG Doctor, NOT to look at the module but rather to a= dvise on a structure given the requirements to which Ian said that he had n= ot had much joy with YANG Doctors. I append our most recent exchange in wh= ich he responds to my query as to why there are seven modules; formatting i= s a bit of a mess I am afraid. The posts are to the DHCWG mail list.=0A= =0A= Any advice appreciated even if it is that Ian is on just the right track!= =0A= =0A= Tom Petch=0A= =0A= On 19/01/2021 11:25, tom petch wrote:=0A= > ________________________________________=0A= > From: dhcwg on behalf of ianfarrer@gmx.com =0A= > Sent: 19 January 2021 07:37=0A= >=0A= > Thanks for your comments. Please see inline below.=0A= >=0A= > Ian=0A= >=0A= > On 14. Jan 2021, at 13:40, t petch > wrote:=0A= >=0A= > Ian=0A= >=0A= > I do not understand this I-D; I have tracked it for a number of years and= my understanding of it is diminishing.=0A= >=0A= > Currently, it is seven YANG modules: why?=0A= >=0A= > [if - The separation into client/server/relay, and DHCP options has been = in the draft since -05 and the changes were presented and discussed at IETF= 101 - I=92ve described the reasoning for this split in the next answer. Bey= ond that, the common module was added to avoid (well reduce as you point ou= t below) duplication.=0A= >=0A= > The separation of the option modules came at a later stage based on impor= t dependencies of a single options module. When the options module imports = the client/server/relay modules so it can augment the relevant module based= on identity, an implementation also needs to import these modules and will= declare them in it=92s capabilities as available even though it doesn=92t = implement them. Dividing the options modules avoids the need for deviations= .=0A= >=0A= > Even though there are 7 modules defined here, the likely hood is that an = element implementation would require 3 modules to be implemented (e.g. clie= nt, common and client options).]=0A= >=0A= > [tp] Other WG have models with multiple roles and many options and have a= single YANG module, using the features of YANG to tailor the module to dif= ferent configurations.=0A= >=0A= > [if - It=92s not really tailoring the module to different configurations,= they are for the most part separate functional elements in the network wit= h any device only implementing one of the client, relay or server functions= .=0A= >=0A= > However, even in the case that a device is both a server and a client (e.= g. a home gateway with a client on the WAN and a server on the LAN), the li= kelihood is that these will be done using different software implementation= s, so having separate modules for server and client offers implementation f= lexibility.=0A= >=0A= > In the case of a monolithic module with the relevant client/relay/server = functionality enabled by features, the module would do nothing unless one o= r more of the features was enabled, and Is unlikely that you=92d ever enabl= e more than one. Is this approach used by other WGs? Could you point me to = some some examples as I've only seen features been used as relatively small= optional extensions used when the bulk of the nodes are common?]=0A= =0A= [tp]=0A= Ian=0A= =0A= Almost all the YANG models I know of are single module. For example,=0A= draft-ietf-ospf-yang supports two versions modelled as identity and 28 =0A= options modelled as features.=0A= =0A= draft-ietf-tcpm-yang supports client and server as containers with =0A= if-feature and has other features as well=0A= =0A= draft-ietf-pim-igmp-mld-yang supports five versions of two protocol =0A= using identity=0A= =0A= draft-pce-pcep-yang offers the roles of pcc or pce or both using typedef.= =0A= =0A= And so on and so on. if-feature, when and suchlike provide the =0A= necessary customisation.=0A= =0A= I think that your problems with options are because the identity are =0A= defined in the wrong place. The base, the common module (or part of the = =0A= one and only module) should define what is common, what everyone needs; =0A= if there are three roles and a dozen options, than that is where they =0A= need to be defined.=0A= =0A= Then there can be an object which is configured with the roles of a =0A= particular box, client or server or relay, or if required, a combination = =0A= of the there - simpler if that is out of scope as you suggest.=0A= =0A= My starting point would be a dhc container with a leaf for a role and then = =0A= containers for client, relay, server, added by augment and controlled by = =0A= when pointing at the role.=0A= =0A= I will post something to the netmod WG list - there are lots of people =0A= there with greater exposure than mine who can give better guidance than I.= =0A= =0A= Tom Petch=0A= =0A= > Here you have modelled the options as YANG grouping. The intent of a grou= ping is to provide a block of statements that can be reused so avoiding dup= lication with the attendant problems. Here you have the same grouping in t= riplicate in three different YANG modules which seems to me to be the antit= hesis of a grouping.=0A= >=0A= > [If - We could move the option definitions for "status-code-option-group= =94 (client, server, relay) and =93rapid-commit-option-group, vendor-specif= ic-information-option-group; reconfigure-accept-option-group=94 (client, se= rver) into the common module to resolve the duplication. I didn=92t do this= previously as the intention was to keep options definitions in the options= modules for consistency, but it would be simple to change. ]=0A= >=0A= > [tp] Likewise I find the specification of server v client v relay unusual= .=0A= >=0A= > [If - A similar approach for separated client/server modules is also used= in RFC8676, where the client and server have discrete function, as with DH= CP.]=0A= >=0A= > [tp]I wonder if it is worth consulting a YANG doctor, NOT to show them th= e YANG and invite comments, rather outline in an abstract way what it is yo= u want to model and see what they suggest; that might well be a single YANG= module.=0A= >=0A= > [if - Yes, I=92d be happy to. Is there someone that you have in mind (I= =92ve not had much luck with getting YANG doctor input outside of the forma= l review process in the past)?. I=92m not opposed to changing the way that = the modules are structured on principal, I do however, think that the separ= ation by functional element is logical and simpler for implementers, and I = would like to know what the benefits of a single module (or other structure= ) might be.]=0A= >=0A= > [tp]I do have quite a number of detailed comments but do not think them w= orth making until the I-D seems to me more stable.=0A= >=0A= > [if - It=92d be great if you could supply them as well so I can start goi= ng though them and fixing what=92s currently fixable in parallel to the dis= cussion above.]=0A= >=0A= > Tom Petch=0A= >=0A= > On 07/01/2021 16:10, ianfarrer@gmx.com wrote:= =0A= > Hi Tom,=0A= >= From nobody Wed Jan 20 10:32:42 2021 Return-Path: X-Original-To: netmod@ietfa.amsl.com Delivered-To: netmod@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E66DE3A11D8 for ; Wed, 20 Jan 2021 10:32:40 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.887 X-Spam-Level: X-Spam-Status: No, score=-1.887 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, HTML_MESSAGE=0.001, SPF_HELO_NONE=0.001, T_SPF_PERMERROR=0.01, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (2048-bit key) header.d=yumaworks-com.20150623.gappssmtp.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id K3ILutcEuDhd for ; Wed, 20 Jan 2021 10:32:38 -0800 (PST) Received: from mail-lf1-x12a.google.com (mail-lf1-x12a.google.com [IPv6:2a00:1450:4864:20::12a]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 405613A11D7 for ; Wed, 20 Jan 2021 10:32:38 -0800 (PST) Received: by mail-lf1-x12a.google.com with SMTP id h7so6208614lfc.6 for ; Wed, 20 Jan 2021 10:32:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yumaworks-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=jPmL2ct493RK1S22fbHChYzmDcX1ni90O/AT9d4EYcU=; b=ir9XAMj1nkfuQPoKaqD7bj2dmUsUwlpapWLJZYu+Kgh0DRtDBRSaQ/riuZ9XCPebMF 2wjz3Wdiyu90sk6CT8BL9soxvJR0WRJvwPFPT+RAZrV2AxNF8pgGBUDiqfJXGaNkeZqJ oGIoSrNy3ban0n5YmgblT9Lb9svRA6mNUuc1vo5KrEzsPiFqlqGIkGv5J0urtgY2Lwta uz+Pu3GjW3nfj02BUlq6QfW3/XtXvmc0bTwnIVNNjh59v3SdleU0GOZhvW2BSK1lNp4k o/iQCX2MmuekG0V6/hatq3nfp8W82ya+swwjWCQId/Fm0WFNfo77taO1nkZhcoXREkxQ sRCQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=jPmL2ct493RK1S22fbHChYzmDcX1ni90O/AT9d4EYcU=; b=BtzEvMJm7l0VfNPXc+iemre1NgQ/6n01dW5h8AsaqJDGqGesEW0WWFUrlA3gKJ+bI/ 7xc6BeFDHsXnptAx44DrkHZTCi+bYbqGRbJFHo5AzQVpElAWPHAdkcTH9jR+T6qtrKLr DQ2EC81ffNfZ2/rA5nSEMe6RpQXDFrX6VIF8C5jf6nWhu59uF9faOzmonq7APCaVt0gQ IiaL03iNvf1IIDA6LBnzJVM2mkNtgUcUVZm+7h++5MSmITraZec66v/zv6Tnclw9Q7wK aDHV5vUb4rJTHD+l6m8Mc6+ndgtOYav+73MU9/pUb6yfpruMZ1zRkQ4mMMfV66aMeVbS QN7g== X-Gm-Message-State: AOAM530wVPcLR7hde9MTBukuQ50PoVRqTnYR2CTen5lNCvqt0f0MXvM0 ryNteCQzLc7FI9EjxBO7ZBkx8enqvuPPWUBf5a5VEA== X-Google-Smtp-Source: ABdhPJzavboqkVXwNZumTdVVJac3ABG3oL2MQlqPJi/CGSljS6tAV8Ize0dyR93P7NVllRubMP2BJE2WqSq5wdawXno= X-Received: by 2002:a19:4107:: with SMTP id o7mr4499233lfa.512.1611167555944; Wed, 20 Jan 2021 10:32:35 -0800 (PST) MIME-Version: 1.0 References: <161100770222.25746.4414271883591983954@ietfa.amsl.com> In-Reply-To: From: Andy Bierman Date: Wed, 20 Jan 2021 10:32:25 -0800 Message-ID: To: tom petch Cc: "netmod@ietf.org" , Juergen Schoenwaelder , =?UTF-8?Q?Martin_Bj=C3=B6rklund?= , Ladislav Lhotka , "ianfarrer@gmx.com" Content-Type: multipart/alternative; boundary="000000000000d89d7905b9592db7" Archived-At: Subject: Re: [netmod] Structuring a DHCP module X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 Jan 2021 18:32:41 -0000 --000000000000d89d7905b9592db7 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, Jan 20, 2021 at 8:41 AM tom petch wrote: > Juergen, Lada, Martin, Andy > > I wonder if one of you, or perhaps another on this list, would be willing > to give advice on the > structuring of the YANG module for DHCP. It has been revised and > restructured several times and, to me, is not progressing. > > It models three roles - client, server, relay - and a dozen optional > function which can appear in one or more roles. A node will likely have > only one role but may have many options. > > There are, at present, seven modules > server which defines a server identity based on common identity inter al= ia > relay which defines relay identity ditto > client which defines client identity ditto > server options which has groupings for each option for a server > client options which has groupings for each option for a relay > relay options which has groupings for each option for a client > common which defines the common identity inter alia > Since options are common across roles, some groupings are replicated in > the three options modules. Three separate option modules were created to > avoid problems with imports as Ian explains below. The I-D is > draft-ietf-dhc-dhcpv6-yang > > My take is that one module is best, using 'when' or if-feature to select, > which is what I see with OSPF, PCE, TCP, IGMP and almost everything else > but am struggling to convince others, especially the author Ian. [IF] i= n > the e-mail extract below > > I suggested asking a YANG Doctor, NOT to look at the module but rather to > advise on a structure given the requirements to which Ian said that he ha= d > not had much joy with YANG Doctors. I append our most recent exchange in > which he responds to my query as to why there are seven modules; formatti= ng > is a bit of a mess I am afraid. The posts are to the DHCWG mail list. > > Any advice appreciated even if it is that Ian is on just the right track! > Either approach is valid so multi-module vs. single module w/ features is more of an overall system maintenance issue. 7 modules seems like a lot for DHCP but I have no objective criteria to back that up. There is some confusion about the import-stmt, which leads to many YANG modules. In compiler terms, importing a module merely makes the symbols available for parsing in the current module. The import-stmt implies no conformance requirements whatsoever. Only statements that use the imported module can do that. (So a server module importing a module that has client groupings is not actually a problem.) YANG Conformance for a single module is better defined than for multiple related modules. The YANG Packages work could fix that someday. . > Tom Petch > Andy > > On 19/01/2021 11:25, tom petch wrote: > > ________________________________________ > > From: dhcwg on behalf of ianfarrer@gmx.com < > ianfarrer@gmx.com> > > Sent: 19 January 2021 07:37 > > > > Thanks for your comments. Please see inline below. > > > > Ian > > > > On 14. Jan 2021, at 13:40, t petch ietfa@btconnect.com>> wrote: > > > > Ian > > > > I do not understand this I-D; I have tracked it for a number of years > and my understanding of it is diminishing. > > > > Currently, it is seven YANG modules: why? > > > > [if - The separation into client/server/relay, and DHCP options has bee= n > in the draft since -05 and the changes were presented and discussed at > IETF101 - I=E2=80=99ve described the reasoning for this split in the next= answer. > Beyond that, the common module was added to avoid (well reduce as you poi= nt > out below) duplication. > > > > The separation of the option modules came at a later stage based on > import dependencies of a single options module. When the options module > imports the client/server/relay modules so it can augment the relevant > module based on identity, an implementation also needs to import these > modules and will declare them in it=E2=80=99s capabilities as available e= ven though > it doesn=E2=80=99t implement them. Dividing the options modules avoids th= e need for > deviations. > > > > Even though there are 7 modules defined here, the likely hood is that a= n > element implementation would require 3 modules to be implemented (e.g. > client, common and client options).] > > > > [tp] Other WG have models with multiple roles and many options and have > a single YANG module, using the features of YANG to tailor the module to > different configurations. > > > > [if - It=E2=80=99s not really tailoring the module to different configu= rations, > they are for the most part separate functional elements in the network wi= th > any device only implementing one of the client, relay or server functions= . > > > > However, even in the case that a device is both a server and a client > (e.g. a home gateway with a client on the WAN and a server on the LAN), t= he > likelihood is that these will be done using different software > implementations, so having separate modules for server and client offers > implementation flexibility. > > > > In the case of a monolithic module with the relevant client/relay/serve= r > functionality enabled by features, the module would do nothing unless one > or more of the features was enabled, and Is unlikely that you=E2=80=99d e= ver enable > more than one. Is this approach used by other WGs? Could you point me to > some some examples as I've only seen features been used as relatively sma= ll > optional extensions used when the bulk of the nodes are common?] > > [tp] > Ian > > Almost all the YANG models I know of are single module. For example, > draft-ietf-ospf-yang supports two versions modelled as identity and 28 > options modelled as features. > > draft-ietf-tcpm-yang supports client and server as containers with > if-feature and has other features as well > > draft-ietf-pim-igmp-mld-yang supports five versions of two protocol > using identity > > draft-pce-pcep-yang offers the roles of pcc or pce or both using typedef. > > And so on and so on. if-feature, when and suchlike provide the > necessary customisation. > > I think that your problems with options are because the identity are > defined in the wrong place. The base, the common module (or part of the > one and only module) should define what is common, what everyone needs; > if there are three roles and a dozen options, than that is where they > need to be defined. > > Then there can be an object which is configured with the roles of a > particular box, client or server or relay, or if required, a combination > of the there - simpler if that is out of scope as you suggest. > > My starting point would be a dhc container with a leaf for a role and the= n > containers for client, relay, server, added by augment and controlled by > when pointing at the role. > > I will post something to the netmod WG list - there are lots of people > there with greater exposure than mine who can give better guidance than I= . > > Tom Petch > > > Here you have modelled the options as YANG grouping. The intent of a > grouping is to provide a block of statements that can be reused so avoidi= ng > duplication with the attendant problems. Here you have the same grouping > in triplicate in three different YANG modules which seems to me to be the > antithesis of a grouping. > > > > [If - We could move the option definitions for > "status-code-option-group=E2=80=9D (client, server, relay) and > =E2=80=9Crapid-commit-option-group, vendor-specific-information-option-gr= oup; > reconfigure-accept-option-group=E2=80=9D (client, server) into the common= module to > resolve the duplication. I didn=E2=80=99t do this previously as the inten= tion was > to keep options definitions in the options modules for consistency, but i= t > would be simple to change. ] > > > > [tp] Likewise I find the specification of server v client v relay > unusual. > > > > [If - A similar approach for separated client/server modules is also > used in RFC8676, where the client and server have discrete function, as > with DHCP.] > > > > [tp]I wonder if it is worth consulting a YANG doctor, NOT to show them > the YANG and invite comments, rather outline in an abstract way what it i= s > you want to model and see what they suggest; that might well be a single > YANG module. > > > > [if - Yes, I=E2=80=99d be happy to. Is there someone that you have in m= ind (I=E2=80=99ve > not had much luck with getting YANG doctor input outside of the formal > review process in the past)?. I=E2=80=99m not opposed to changing the way= that the > modules are structured on principal, I do however, think that the > separation by functional element is logical and simpler for implementers, > and I would like to know what the benefits of a single module (or other > structure) might be.] > > > > [tp]I do have quite a number of detailed comments but do not think them > worth making until the I-D seems to me more stable. > > > > [if - It=E2=80=99d be great if you could supply them as well so I can s= tart > going though them and fixing what=E2=80=99s currently fixable in parallel= to the > discussion above.] > > > > Tom Petch > > > > On 07/01/2021 16:10, ianfarrer@gmx.com wrote: > > Hi Tom, > > --000000000000d89d7905b9592db7 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


=
On Wed, Jan 20, 2021 at 8:41 AM tom p= etch <ietfc@btconnect.com>= wrote:
Juergen,= Lada, Martin, Andy

I wonder if one of you, or perhaps another on this list, would be willing t= o give advice on the
structuring of=C2=A0 the YANG module for DHCP.=C2=A0 It has been revised an= d restructured several times and, to me, is not progressing.

It models three roles - client, server, relay - and a dozen optional functi= on which can appear in one or more roles.=C2=A0 A node will likely have onl= y one role but may have many options.

There are, at present, seven modules
server which defines a server identity=C2=A0 based on common identity inter= alia
relay which defines relay identity ditto
client which defines client identity ditto
server options which has groupings for each option for a server
client options which has groupings for each option for a relay
relay options which has groupings for each option for a client
common which defines the common identity inter alia
Since options are common across roles, some groupings are replicated in the= three options modules.=C2=A0 Three separate option modules were created to= avoid problems with imports as Ian explains below.=C2=A0 The I-D is draft-= ietf-dhc-dhcpv6-yang

My take is that one module is best, using 'when' or if-feature to s= elect, which is what I see with OSPF, PCE, TCP, IGMP and almost everything = else but am struggling to convince others, especially=C2=A0 the author Ian.= =C2=A0 [IF] in the e-mail extract below

I suggested asking a YANG Doctor, NOT to look at the module but rather to a= dvise on a structure given the requirements to which Ian said that he had n= ot had much joy with YANG Doctors.=C2=A0 I append our most recent exchange = in which he responds to my query as to why there are seven modules; formatt= ing is a bit of a mess I am afraid.=C2=A0 The posts are to the DHCWG mail l= ist.

Any advice appreciated even if it is that Ian is on just the right track!


Either approach is valid = so multi-module vs. single module w/ features is more
of an overa= ll system maintenance issue.=C2=A0 7 modules seems like a lot for DHCP but<= /div>
I have no objective criteria to back that up.=C2=A0
There is some confusion about the import-stmt, which leads to m= any YANG modules.
In compiler terms, importing a module merely ma= kes the symbols available for parsing in the current module.
The = import-stmt implies no conformance requirements whatsoever.
Only = statements that use the imported module can do that.
(So a server= module importing a module that has client groupings is not actually a prob= lem.)

YANG Conformance for a single module is bett= er defined than for multiple related modules.
The YANG Packages w= ork could fix that someday.
.


=

Tom Petch


Andy
=C2=A0

On 19/01/2021 11:25, tom petch wrote:
> ________________________________________
> From: dhcwg <dhcwg-bounces@ietf.org> on behalf of ianfarrer@gmx.com <ianfarrer@gmx.com>
> Sent: 19 January 2021 07:37
>
> Thanks for your comments. Please see inline below.
>
> Ian
>
> On 14. Jan 2021, at 13:40, t petch <ietfa@btconnect.com<mailto:ietfa@btconnect.com>> w= rote:
>
> Ian
>
> I do not understand this I-D; I have tracked it for a number of years = and my understanding of it is diminishing.
>
> Currently, it is seven YANG modules: why?
>
> [if - The separation into client/server/relay, and DHCP options has be= en in the draft since -05 and the changes were presented and discussed at I= ETF101 - I=E2=80=99ve described the reasoning for this split in the next an= swer. Beyond that, the common module was added to avoid (well reduce as you= point out below) duplication.
>
> The separation of the option modules came at a later stage based on im= port dependencies of a single options module. When the options module impor= ts the client/server/relay modules so it can augment the relevant module ba= sed on identity, an implementation also needs to import these modules and w= ill declare them in it=E2=80=99s capabilities as available even though it d= oesn=E2=80=99t implement them. Dividing the options modules avoids the need= for deviations.
>
> Even though there are 7 modules defined here, the likely hood is that = an element implementation would require 3 modules to be implemented (e.g. c= lient, common and client options).]
>
> [tp] Other WG have models with multiple roles and many options and hav= e a single YANG module, using the features of YANG to tailor the module to = different configurations.
>
> [if - It=E2=80=99s not really tailoring the module to different config= urations, they are for the most part separate functional elements in the ne= twork with any device only implementing one of the client, relay or server = functions.
>
> However, even in the case that a device is both a server and a client = (e.g. a home gateway with a client on the WAN and a server on the LAN), the= likelihood is that these will be done using different software implementat= ions, so having separate modules for server and client offers implementatio= n flexibility.
>
> In the case of a monolithic module with the relevant client/relay/serv= er functionality enabled by features, the module would do nothing unless on= e or more of the features was enabled, and Is unlikely that you=E2=80=99d e= ver enable more than one. Is this approach used by other WGs? Could you poi= nt me to some some examples as I've only seen features been used as rel= atively small optional extensions used when the bulk of the nodes are commo= n?]

[tp]
Ian

Almost all the YANG models I know of are single module.=C2=A0 For example,<= br> draft-ietf-ospf-yang supports two versions modelled as identity and 28
options modelled as features.

draft-ietf-tcpm-yang supports client and server as containers with
if-feature and has other features as well

draft-ietf-pim-igmp-mld-yang supports five versions of two protocol
using identity

draft-pce-pcep-yang offers the roles of pcc or pce or both using typedef.
And so on and so on.=C2=A0 if-feature, when and suchlike provide the
necessary customisation.

I think that your problems with options are because the identity are
defined in the wrong place.=C2=A0 The base, the common module (or part of t= he
one and only module) should define what is common, what everyone needs; if there are three roles and a dozen options, than that is where they
need to be defined.

Then there can be an object which is configured with the roles of a
particular box, client or server or relay, or if required, a combination of the there - simpler if that is out of scope as you suggest.

My starting point would be a dhc container with a leaf for a role and then =
containers for client, relay, server, added by augment and controlled by when pointing at the role.

I will post something to the netmod WG list - there are lots of people
there with greater exposure than mine who can give better guidance than I.<= br>
Tom Petch

> Here you have modelled the options as YANG grouping. The intent of a g= rouping is to provide a block of statements that can be reused so avoiding = duplication with the attendant problems.=C2=A0 Here you have the same group= ing in triplicate in three different YANG modules which seems to me to be t= he antithesis of a grouping.
>
> [If - We could move the option definitions for "status-code-optio= n-group=E2=80=9D (client, server, relay) and =E2=80=9Crapid-commit-option-g= roup, vendor-specific-information-option-group; reconfigure-accept-option-g= roup=E2=80=9D (client, server) into the common module to resolve the duplic= ation. I didn=E2=80=99t do this previously as the intention was to keep opt= ions definitions in the options modules for consistency, but it=C2=A0 would= be simple to change. ]
>
> [tp] Likewise I find the specification of server v client v relay unus= ual.
>
> [If - A similar approach for separated client/server modules is also u= sed in RFC8676, where the client and server have discrete function, as with= DHCP.]
>
> [tp]I wonder if it is worth consulting a YANG doctor, NOT to show them= the YANG and invite comments, rather outline in an abstract way what it is= you want to model and see what they suggest; that might well be a single Y= ANG module.
>
> [if - Yes, I=E2=80=99d be happy to. Is there someone that you have in = mind (I=E2=80=99ve not had much luck with getting YANG doctor input outside= of the formal review process in the past)?. I=E2=80=99m not opposed to cha= nging the way that the modules are structured on principal, I do however, t= hink that the separation by functional element is logical and simpler for i= mplementers, and I would like to know what the benefits of a single module = (or other structure) might be.]
>
> [tp]I do have quite a number of detailed comments but do not think the= m worth making until the I-D seems to me more stable.
>
> [if - It=E2=80=99d be great if you could supply them as well so I can = start going though them and fixing what=E2=80=99s currently fixable in para= llel to the discussion above.]
>
> Tom Petch
>
> On 07/01/2021 16:10, ianfarrer@gmx.com<mailto:ianfarrer@gmx.com> wrote:
> Hi Tom,
>
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charset="Windows-1252" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: btconnect.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: AM7PR07MB6248.eurprd07.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: a3374518-3da3-43d2-ee92-08d8be04f52d X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Jan 2021 12:06:17.4793 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: cf8853ed-96e5-465b-9185-806bfe185e30 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: bhHc/lrnEZcsDr7YmpEzSDGcIhj3eQaaTcB5/p4/Bdy8b0mpC6dy5gaPCVLBYaFKUbT7ZUpwhBosXQ05VgqXDQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM7PR07MB6247 Archived-At: Subject: Re: [netmod] Structuring a DHCP module X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Jan 2021 12:06:32 -0000 =0A= Inline =0A= =0A= From: Andy Bierman =0A= Sent: 20 January 2021 18:32=0A= =0A= On Wed, Jan 20, 2021 at 8:41 AM tom petch > wrote:=0A= Juergen, Lada, Martin, Andy=0A= =0A= I wonder if one of you, or perhaps another on this list, would be willing t= o give advice on the=0A= structuring of the YANG module for DHCP. It has been revised and restruct= ured several times and, to me, is not progressing.=0A= =0A= It models three roles - client, server, relay - and a dozen optional functi= on which can appear in one or more roles. A node will likely have only one= role but may have many options.=0A= =0A= There are, at present, seven modules=0A= server which defines a server identity based on common identity inter alia= =0A= relay which defines relay identity ditto=0A= client which defines client identity ditto=0A= server options which has groupings for each option for a server=0A= client options which has groupings for each option for a relay=0A= relay options which has groupings for each option for a client=0A= common which defines the common identity inter alia=0A= Since options are common across roles, some groupings are replicated in the= three options modules. Three separate option modules were created to avoi= d problems with imports as Ian explains below. The I-D is draft-ietf-dhc-d= hcpv6-yang=0A= =0A= My take is that one module is best, using 'when' or if-feature to select, w= hich is what I see with OSPF, PCE, TCP, IGMP and almost everything else but= am struggling to convince others, especially the author Ian. [IF] in the= e-mail extract below=0A= =0A= I suggested asking a YANG Doctor, NOT to look at the module but rather to a= dvise on a structure given the requirements to which Ian said that he had n= ot had much joy with YANG Doctors. I append our most recent exchange in wh= ich he responds to my query as to why there are seven modules; formatting i= s a bit of a mess I am afraid. The posts are to the DHCWG mail list.=0A= =0A= Any advice appreciated even if it is that Ian is on just the right track!= =0A= =0A= =0A= Either approach is valid so multi-module vs. single module w/ features is m= ore=0A= of an overall system maintenance issue. 7 modules seems like a lot for DHC= P but=0A= I have no objective criteria to back that up.=0A= =0A= There is some confusion about the import-stmt, which leads to many YANG mod= ules.=0A= In compiler terms, importing a module merely makes the symbols available fo= r parsing in the current module.=0A= The import-stmt implies no conformance requirements whatsoever.=0A= Only statements that use the imported module can do that.=0A= (So a server module importing a module that has client groupings is not act= ually a problem.)=0A= =0A= =0A= =0A= Andy, Juergen,=0A= =0A= Thank you for the replies. What Ian said about the import is=0A= =0A= > [IF] The separation of the option modules came at a later stage based on = import dependencies of a single options module. When the options module imp= orts the client/server/relay modules so it can augment the relevant module = based on identity, an implementation also needs to import these modules and= will declare them in it=92s capabilities as available even though it doesn= =92t implement them. Dividing the options modules avoids the need for devia= tions.=0A= =0A= that is, the prefix for dhcpv6-server is defined in the server module,= =0A= module ietf-dhcpv6-server {=0A= ...=0A= prefix "dhcpv6-server";=0A= ...=0A= identity server {=0A= base "dhcpv6-common:dhcpv6-node";=0A= description "DHCPv6 server identity."; }=0A= leaf dhcpv6-node-type {=0A= type identityref {=0A= base "dhcpv6-common:dhcpv6-node"; }=0A= description "Type for a DHCPv6 server."; }=0A= =0A= and the prefix for dhcpv6-relay in the relay module etc so having a single = module for options which needs to augment options to the server module need= s to import the server module so that the dhcpv6-server prefix is defined, = ditto relay and client so the single module for options then imports server= and relay and client modules.=0A= =0A= With three options modules, each only imports one of server, relay, client = but the groupings are then replicated across the three options modules.=0A= =0A= Logical if you agree with the initial premise (which I do not!). =0A= =0A= The seven YANG modules are all in the one I-D of 56pp with the tree diagram= s 12pp.=0A= =0A= Tom Petch=0A= (on European time:-(=0A= =0A= YANG Conformance for a single module is better defined than for multiple re= lated modules.=0A= The YANG Packages work could fix that someday.=0A= =0A= Tom Petch=0A= =0A= =0A= Andy=0A= =0A= =0A= On 19/01/2021 11:25, tom petch wrote:=0A= > ________________________________________=0A= > From: dhcwg > on be= half of ianfarrer@gmx.com >=0A= > Sent: 19 January 2021 07:37=0A= >=0A= > Thanks for your comments. Please see inline below.=0A= >=0A= > Ian=0A= >=0A= > On 14. Jan 2021, at 13:40, t petch >> wrote:= =0A= >=0A= > Ian=0A= >=0A= > I do not understand this I-D; I have tracked it for a number of years and= my understanding of it is diminishing.=0A= >=0A= > Currently, it is seven YANG modules: why?=0A= >=0A= > [if - The separation into client/server/relay, and DHCP options has been = in the draft since -05 and the changes were presented and discussed at IETF= 101 - I=92ve described the reasoning for this split in the next answer. Bey= ond that, the common module was added to avoid (well reduce as you point ou= t below) duplication.=0A= >=0A= > The separation of the option modules came at a later stage based on impor= t dependencies of a single options module. When the options module imports = the client/server/relay modules so it can augment the relevant module based= on identity, an implementation also needs to import these modules and will= declare them in it=92s capabilities as available even though it doesn=92t = implement them. Dividing the options modules avoids the need for deviations= .=0A= >=0A= > Even though there are 7 modules defined here, the likely hood is that an = element implementation would require 3 modules to be implemented (e.g. clie= nt, common and client options).]=0A= >=0A= > [tp] Other WG have models with multiple roles and many options and have a= single YANG module, using the features of YANG to tailor the module to dif= ferent configurations.=0A= >=0A= > [if - It=92s not really tailoring the module to different configurations,= they are for the most part separate functional elements in the network wit= h any device only implementing one of the client, relay or server functions= .=0A= >=0A= > However, even in the case that a device is both a server and a client (e.= g. a home gateway with a client on the WAN and a server on the LAN), the li= kelihood is that these will be done using different software implementation= s, so having separate modules for server and client offers implementation f= lexibility.=0A= >=0A= > In the case of a monolithic module with the relevant client/relay/server = functionality enabled by features, the module would do nothing unless one o= r more of the features was enabled, and Is unlikely that you=92d ever enabl= e more than one. Is this approach used by other WGs? Could you point me to = some some examples as I've only seen features been used as relatively small= optional extensions used when the bulk of the nodes are common?]=0A= =0A= [tp]=0A= Ian=0A= =0A= Almost all the YANG models I know of are single module. For example,=0A= draft-ietf-ospf-yang supports two versions modelled as identity and 28=0A= options modelled as features.=0A= =0A= draft-ietf-tcpm-yang supports client and server as containers with=0A= if-feature and has other features as well=0A= =0A= draft-ietf-pim-igmp-mld-yang supports five versions of two protocol=0A= using identity=0A= =0A= draft-pce-pcep-yang offers the roles of pcc or pce or both using typedef.= =0A= =0A= And so on and so on. if-feature, when and suchlike provide the=0A= necessary customisation.=0A= =0A= I think that your problems with options are because the identity are=0A= defined in the wrong place. The base, the common module (or part of the=0A= one and only module) should define what is common, what everyone needs;=0A= if there are three roles and a dozen options, than that is where they=0A= need to be defined.=0A= =0A= Then there can be an object which is configured with the roles of a=0A= particular box, client or server or relay, or if required, a combination=0A= of the there - simpler if that is out of scope as you suggest.=0A= =0A= My starting point would be a dhc container with a leaf for a role and then= =0A= containers for client, relay, server, added by augment and controlled by=0A= when pointing at the role.=0A= =0A= I will post something to the netmod WG list - there are lots of people=0A= there with greater exposure than mine who can give better guidance than I.= =0A= =0A= Tom Petch=0A= =0A= > Here you have modelled the options as YANG grouping. The intent of a grou= ping is to provide a block of statements that can be reused so avoiding dup= lication with the attendant problems. Here you have the same grouping in t= riplicate in three different YANG modules which seems to me to be the antit= hesis of a grouping.=0A= >=0A= > [If - We could move the option definitions for "status-code-option-group= =94 (client, server, relay) and =93rapid-commit-option-group, vendor-specif= ic-information-option-group; reconfigure-accept-option-group=94 (client, se= rver) into the common module to resolve the duplication. I didn=92t do this= previously as the intention was to keep options definitions in the options= modules for consistency, but it would be simple to change. ]=0A= >=0A= > [tp] Likewise I find the specification of server v client v relay unusual= .=0A= >=0A= > [If - A similar approach for separated client/server modules is also used= in RFC8676, where the client and server have discrete function, as with DH= CP.]=0A= >=0A= > [tp]I wonder if it is worth consulting a YANG doctor, NOT to show them th= e YANG and invite comments, rather outline in an abstract way what it is yo= u want to model and see what they suggest; that might well be a single YANG= module.=0A= >=0A= > [if - Yes, I=92d be happy to. Is there someone that you have in mind (I= =92ve not had much luck with getting YANG doctor input outside of the forma= l review process in the past)?. I=92m not opposed to changing the way that = the modules are structured on principal, I do however, think that the separ= ation by functional element is logical and simpler for implementers, and I = would like to know what the benefits of a single module (or other structure= ) might be.]=0A= >=0A= > [tp]I do have quite a number of detailed comments but do not think them w= orth making until the I-D seems to me more stable.=0A= >=0A= > [if - It=92d be great if you could supply them as well so I can start goi= ng though them and fixing what=92s currently fixable in parallel to the dis= cussion above.]=0A= >=0A= > Tom Petch=0A= >=0A= > On 07/01/2021 16:10, ianfarrer@gmx.com> wrote:=0A= > Hi Tom,=0A= >=0A= From nobody Thu Jan 21 04:42:18 2021 Return-Path: X-Original-To: netmod@ietfa.amsl.com Delivered-To: netmod@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6337F3A09E0 for ; Thu, 21 Jan 2021 04:42:17 -0800 (PST) X-Virus-Scanned: 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key) header.d=nic.cz Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mhLLWrwGI0T2 for ; Thu, 21 Jan 2021 04:58:51 -0800 (PST) Received: from mail.nic.cz (mail.nic.cz [217.31.204.67]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 40B053A0A21 for ; Thu, 21 Jan 2021 04:58:50 -0800 (PST) Received: from [IPv6:2001:1488:fffe:6:a88f:7eff:fed2:45f8] (unknown [IPv6:2001:1488:fffe:6:a88f:7eff:fed2:45f8]) by mail.nic.cz (Postfix) with ESMTPSA id E388F1420EF; Thu, 21 Jan 2021 13:58:46 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=nic.cz; s=default; t=1611233927; bh=y5HQKvADzjw9mlbodhrmCLys0109Tp9M5PUEIwJYrfE=; h=To:From:Date; b=XoqZoaL7pNoCJIkqbc+FU+Zh84Jp5CosAMVHovZwEzrrYVzZsiQ7U2UVmkeuHJvGA mj+XG2s6ebYtPfZastXrDeSATZPodbNP774rItcrC7zknG8i+ewyZPB3sTaXG1gbA/ iKupLIrK6TCceY/n0rMUPz5m86iXU4p1sZyasq0w= To: =?UTF-8?Q?Martin_Bj=c3=b6rklund?= , ietfc@btconnect.com Cc: andy@yumaworks.com, netmod@ietf.org, j.schoenwaelder@jacobs-university.de, ianfarrer@gmx.com References: <20210121.134211.1244086498697136841.id@4668.se> From: Ladislav Lhotka Organization: CZ.NIC Message-ID: <77892263-e7f9-bef3-b9ab-cff36f382891@nic.cz> Date: Thu, 21 Jan 2021 13:58:46 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.1 MIME-Version: 1.0 In-Reply-To: <20210121.134211.1244086498697136841.id@4668.se> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit X-Virus-Scanned: clamav-milter 0.102.2 at mail X-Virus-Status: Clean Archived-At: Subject: Re: [netmod] Structuring a DHCP module X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Jan 2021 12:58:54 -0000 Hi, in my YD review 4.5 years ago I actually recommended to use separate modules: https://mailarchive.ietf.org/arch/msg/yang-doctors/GXHkGqZeIidMzpziZmK_ICrKPs4/ I think it is a matter of how much the different part overlap. For an implementer, it seems to be easier to pick just the relevant parts, provided they are easy to locate and identify. Lada On 21. 01. 21 13:42, Martin Björklund wrote: > Hi, > > I think it is a matter of taste and perhaps future extensibility if > this model is done as one or more YANG modules. It can certainly be > done in one module, with features for client, server and relay, but it > is also ok to have 3 modules for the different functions. And once > you have these 3 modules, it is natural to have a "common" module, > leading to 4 modules. In order to keep the number of modules down, > perhaps the various -options modules could be merged into the other > 3, probably with a feature each. > > One comment is that it might be wise to avoid having a rfc number in > the identifier. What happens if/when that RFC is revised for any > reason? > > > /martin > > > tom petch wrote: >> >> Inline >> >> From: Andy Bierman >> Sent: 20 January 2021 18:32 >> >> On Wed, Jan 20, 2021 at 8:41 AM tom petch > wrote: >> Juergen, Lada, Martin, Andy >> >> I wonder if one of you, or perhaps another on this list, would be willing to give advice on the >> structuring of the YANG module for DHCP. It has been revised and restructured several times and, to me, is not progressing. >> >> It models three roles - client, server, relay - and a dozen optional function which can appear in one or more roles. A node will likely have only one role but may have many options. >> >> There are, at present, seven modules >> server which defines a server identity based on common identity inter alia >> relay which defines relay identity ditto >> client which defines client identity ditto >> server options which has groupings for each option for a server >> client options which has groupings for each option for a relay >> relay options which has groupings for each option for a client >> common which defines the common identity inter alia >> Since options are common across roles, some groupings are replicated in the three options modules. Three separate option modules were created to avoid problems with imports as Ian explains below. The I-D is draft-ietf-dhc-dhcpv6-yang >> >> My take is that one module is best, using 'when' or if-feature to select, which is what I see with OSPF, PCE, TCP, IGMP and almost everything else but am struggling to convince others, especially the author Ian. [IF] in the e-mail extract below >> >> I suggested asking a YANG Doctor, NOT to look at the module but rather to advise on a structure given the requirements to which Ian said that he had not had much joy with YANG Doctors. I append our most recent exchange in which he responds to my query as to why there are seven modules; formatting is a bit of a mess I am afraid. The posts are to the DHCWG mail list. >> >> Any advice appreciated even if it is that Ian is on just the right track! >> >> >> Either approach is valid so multi-module vs. single module w/ features is more >> of an overall system maintenance issue. 7 modules seems like a lot for DHCP but >> I have no objective criteria to back that up. >> >> There is some confusion about the import-stmt, which leads to many YANG modules. >> In compiler terms, importing a module merely makes the symbols available for parsing in the current module. >> The import-stmt implies no conformance requirements whatsoever. >> Only statements that use the imported module can do that. >> (So a server module importing a module that has client groupings is not actually a problem.) >> >> >> >> Andy, Juergen, >> >> Thank you for the replies. What Ian said about the import is >> >>> [IF] The separation of the option modules came at a later stage based on import dependencies of a single options module. When the options module imports the client/server/relay modules so it can augment the relevant module based on identity, an implementation also needs to import these modules and will declare them in it’s capabilities as available even though it doesn’t implement them. Dividing the options modules avoids the need for deviations. >> >> that is, the prefix for dhcpv6-server is defined in the server module, >> module ietf-dhcpv6-server { >> ... >> prefix "dhcpv6-server"; >> ... >> identity server { >> base "dhcpv6-common:dhcpv6-node"; >> description "DHCPv6 server identity."; } >> leaf dhcpv6-node-type { >> type identityref { >> base "dhcpv6-common:dhcpv6-node"; } >> description "Type for a DHCPv6 server."; } >> >> and the prefix for dhcpv6-relay in the relay module etc so having a single module for options which needs to augment options to the server module needs to import the server module so that the dhcpv6-server prefix is defined, ditto relay and client so the single module for options then imports server and relay and client modules. >> >> With three options modules, each only imports one of server, relay, client but the groupings are then replicated across the three options modules. >> >> Logical if you agree with the initial premise (which I do not!). >> >> The seven YANG modules are all in the one I-D of 56pp with the tree diagrams 12pp. >> >> Tom Petch >> (on European time:-( >> >> YANG Conformance for a single module is better defined than for multiple related modules. >> The YANG Packages work could fix that someday. >> >> Tom Petch >> >> >> Andy >> >> >> On 19/01/2021 11:25, tom petch wrote: >>> ________________________________________ >>> From: dhcwg > on behalf of ianfarrer@gmx.com > >>> Sent: 19 January 2021 07:37 >>> >>> Thanks for your comments. Please see inline below. >>> >>> Ian >>> >>> On 14. Jan 2021, at 13:40, t petch >> wrote: >>> >>> Ian >>> >>> I do not understand this I-D; I have tracked it for a number of years and my understanding of it is diminishing. >>> >>> Currently, it is seven YANG modules: why? >>> >>> [if - The separation into client/server/relay, and DHCP options has been in the draft since -05 and the changes were presented and discussed at IETF101 - I’ve described the reasoning for this split in the next answer. Beyond that, the common module was added to avoid (well reduce as you point out below) duplication. >>> >>> The separation of the option modules came at a later stage based on import dependencies of a single options module. When the options module imports the client/server/relay modules so it can augment the relevant module based on identity, an implementation also needs to import these modules and will declare them in it’s capabilities as available even though it doesn’t implement them. Dividing the options modules avoids the need for deviations. >>> >>> Even though there are 7 modules defined here, the likely hood is that an element implementation would require 3 modules to be implemented (e.g. client, common and client options).] >>> >>> [tp] Other WG have models with multiple roles and many options and have a single YANG module, using the features of YANG to tailor the module to different configurations. >>> >>> [if - It’s not really tailoring the module to different configurations, they are for the most part separate functional elements in the network with any device only implementing one of the client, relay or server functions. >>> >>> However, even in the case that a device is both a server and a client (e.g. a home gateway with a client on the WAN and a server on the LAN), the likelihood is that these will be done using different software implementations, so having separate modules for server and client offers implementation flexibility. >>> >>> In the case of a monolithic module with the relevant client/relay/server functionality enabled by features, the module would do nothing unless one or more of the features was enabled, and Is unlikely that you’d ever enable more than one. Is this approach used by other WGs? Could you point me to some some examples as I've only seen features been used as relatively small optional extensions used when the bulk of the nodes are common?] >> >> [tp] >> Ian >> >> Almost all the YANG models I know of are single module. For example, >> draft-ietf-ospf-yang supports two versions modelled as identity and 28 >> options modelled as features. >> >> draft-ietf-tcpm-yang supports client and server as containers with >> if-feature and has other features as well >> >> draft-ietf-pim-igmp-mld-yang supports five versions of two protocol >> using identity >> >> draft-pce-pcep-yang offers the roles of pcc or pce or both using typedef. >> >> And so on and so on. if-feature, when and suchlike provide the >> necessary customisation. >> >> I think that your problems with options are because the identity are >> defined in the wrong place. The base, the common module (or part of the >> one and only module) should define what is common, what everyone needs; >> if there are three roles and a dozen options, than that is where they >> need to be defined. >> >> Then there can be an object which is configured with the roles of a >> particular box, client or server or relay, or if required, a combination >> of the there - simpler if that is out of scope as you suggest. >> >> My starting point would be a dhc container with a leaf for a role and then >> containers for client, relay, server, added by augment and controlled by >> when pointing at the role. >> >> I will post something to the netmod WG list - there are lots of people >> there with greater exposure than mine who can give better guidance than I. >> >> Tom Petch >> >>> Here you have modelled the options as YANG grouping. The intent of a grouping is to provide a block of statements that can be reused so avoiding duplication with the attendant problems. Here you have the same grouping in triplicate in three different YANG modules which seems to me to be the antithesis of a grouping. >>> >>> [If - We could move the option definitions for "status-code-option-group” (client, server, relay) and “rapid-commit-option-group, vendor-specific-information-option-group; reconfigure-accept-option-group” (client, server) into the common module to resolve the duplication. I didn’t do this previously as the intention was to keep options definitions in the options modules for consistency, but it would be simple to change. ] >>> >>> [tp] Likewise I find the specification of server v client v relay unusual. >>> >>> [If - A similar approach for separated client/server modules is also used in RFC8676, where the client and server have discrete function, as with DHCP.] >>> >>> [tp]I wonder if it is worth consulting a YANG doctor, NOT to show them the YANG and invite comments, rather outline in an abstract way what it is you want to model and see what they suggest; that might well be a single YANG module. >>> >>> [if - Yes, I’d be happy to. Is there someone that you have in mind (I’ve not had much luck with getting YANG doctor input outside of the formal review process in the past)?. I’m not opposed to changing the way that the modules are structured on principal, I do however, think that the separation by functional element is logical and simpler for implementers, and I would like to know what the benefits of a single module (or other structure) might be.] >>> >>> [tp]I do have quite a number of detailed comments but do not think them worth making until the I-D seems to me more stable. >>> >>> [if - It’d be great if you could supply them as well so I can start going though them and fixing what’s currently fixable in parallel to the discussion above.] >>> >>> Tom Petch >>> >>> On 07/01/2021 16:10, ianfarrer@gmx.com> wrote: >>> Hi Tom, >>> -- Ladislav Lhotka Head, CZ.NIC Labs PGP Key ID: 0xB8F92B08A9F76C67 From nobody Thu Jan 21 08:29:45 2021 Return-Path: X-Original-To: netmod@ietfa.amsl.com Delivered-To: netmod@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A76813A12BC for ; Thu, 21 Jan 2021 08:29:37 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.918 X-Spam-Level: X-Spam-Status: No, score=-1.918 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=gmx.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4-GpYGauagbS for ; Thu, 21 Jan 2021 08:29:35 -0800 (PST) Received: from mout.gmx.net (mout.gmx.net [212.227.15.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id BA3103A12A3 for ; Thu, 21 Jan 2021 08:29:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1611246559; bh=jZ/h3n1GfKtEzIqrCCp2ldHf/sCT05d47zKP/tW8ohU=; h=X-UI-Sender-Class:Subject:From:In-Reply-To:Date:Cc:References:To; b=V2MwnEcOXFO4vEnlESAwk76GnlW3pDVg+KKJPPd/D67Z5Dq9x5kY8PbWkeaN7wzoo XApd+DqUrNFuO/lt/H5uYd/krxNq148k1nkZg7Wbu9Pm4uShc9NawIFwi+mdRWeh6+ g9/yWIClvUKQPSEP7i/abczG61aBoZrc1tL+Uk24= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from mbp-big-sur.fritz.box ([78.35.205.160]) by mail.gmx.net (mrgmx005 [212.227.17.184]) with ESMTPSA (Nemesis) id 1Mzyya-1lzQBF1hoM-00wz6F; Thu, 21 Jan 2021 17:29:19 +0100 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.40.0.2.32\)) From: ianfarrer@gmx.com In-Reply-To: <77892263-e7f9-bef3-b9ab-cff36f382891@nic.cz> Date: Thu, 21 Jan 2021 17:29:18 +0100 Cc: =?utf-8?Q?Martin_Bj=C3=B6rklund?= , ietfc@btconnect.com, andy@yumaworks.com, netmod@ietf.org, j.schoenwaelder@jacobs-university.de Content-Transfer-Encoding: quoted-printable Message-Id: <9B941200-508A-4E8B-B430-FC45652ACF1D@gmx.com> References: <20210121.134211.1244086498697136841.id@4668.se> <77892263-e7f9-bef3-b9ab-cff36f382891@nic.cz> To: Ladislav Lhotka X-Mailer: Apple Mail (2.3654.40.0.2.32) X-Provags-ID: V03:K1:6cr4y+SBfSKeY0f+aBpiQc8es/Zkj9g18D/1oRVZnavtsu7BpKm 4YAmivCSRB5YnwcwB57eR4tn+UuOFYeeV17aCDYhz5pdqmDBIY6Q+4ynPL98ZlAv0GowuPY qCds3LVAX95LJyiy8L7uzmCJ0hQ8Q6rAMGZ2g2gjfUQkwbNdD4W/QBXwJfVWGoluRMK16lo oXFNJYi0OxKHgjbNft/Hw== X-UI-Out-Filterresults: notjunk:1;V03:K0:QxO/WT1eNKI=:kYo6EULCUsT+OwL/F7dlyn IgNCLhJk8rj2f5fN/Mw4ZZRRVehKbGb51993UJv7itwxYFMAIXaPCJcSRKfF4r0HYvih/uwVp VTY8tu5wW6H2F7wcTeRQBexM3oh3/7zM2+Wm0Bc1Td6TyDMHkNKFIAbGLoCkaLMDEkcJGw2x5 OEY7DZQDvEOhLeOEtbsj5dlXGhWWNR1rHFyfE8g9prTUVgGPF9B/GCrdN2gYZk6SfU32Mx4Ai VDJtHLtlxT/8oWE4Ri0wbks5zF9sm8UK7hQv0YjYNEUEbrAMuoAW7oSKO11euzPF9l00CP6Up vK8eYPE8zq9JysVDSc+xLYWTv5GLtnOyQ0C1SFzgVAofLKKqOslNxGPoZw3MOsHMYznRP5IX8 dFy1QqhaTlK3kte/W/iE/uFNa6ur7pjV4kik5HeTnSs36h/Fu8cwFGUo+rPLVYRyHZ/I+Pcug yVv5Ie4lr1wvA/tF3BaL6FeVkiMeyP7Vx4uccCqzDYhK8mapL66qHvzyODtC5DaONjjS3EwTM CzWL9f7VR2WHpsESuvkiSUtU/LQdSNEe0CtmZGbgDwwTpzXaCJTruv8GUSzZeOx4IeHrj4rQ3 gNmFZoOE7RbMHYL5I/kjwpgKX13PWp1zSdPQIRWwtEAvQO9KNncG3gZk1jOwERv0En7KEOGAw k6J1Ayyy3SZ9Ese1ZD74JcVIlpEM/ZjdoOPUvMANrb0KyYRLgIO3RwPszd3f1BHn7I6sO+PrD GmcP5PvhViRn8mN5S76Q5I+8g/KLVf8jC+Kzxk/QiMNxSWtLe4RpNN6E2m545+jO00rsFsssV xWpD+lwzU+hPuKdBNsmmuS0kYQ1TABS/6Shlio0zZuB/VQz4EqxGHGuR1uWXSX9YxFZ0KN3Aw xX/Z6LotlGsQ4frJDICg== Archived-At: Subject: Re: [netmod] Structuring a DHCP module X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Jan 2021 16:29:43 -0000 Hi, Thanks for all your input on the question. Based on Martin=E2=80=99s = proposal, combining the element modules with their associated options = modules, and moving duplicate option definitions into the common module = (resulting in 4 modules), here=E2=80=99s some very rough calculations on = the resulting amount of overlap: Ietf-dhcpv6-server (total size including unique option definitions, 809 = lines) uses 120 lines from ietf-dhcpv6-common Ietf-dhcpv6-client (562 lines) uses 120 lines from common Ietf-dhcpv6-relay (576 lines) uses 15 lines from common Given this, I would propose following this approach. Does this look = reasonable? Point taken about the rfc numbers in naming the modules. I=E2=80=99ll = look for a better way of naming them. Thanks, Ian > On 21. Jan 2021, at 13:58, Ladislav Lhotka = wrote: >=20 > Hi, >=20 > in my YD review 4.5 years ago I actually recommended to use separate > modules: >=20 > = https://mailarchive.ietf.org/arch/msg/yang-doctors/GXHkGqZeIidMzpziZmK_ICr= KPs4/ >=20 > I think it is a matter of how much the different part overlap. For an > implementer, it seems to be easier to pick just the relevant parts, > provided they are easy to locate and identify. >=20 > Lada >=20 > On 21. 01. 21 13:42, Martin Bj=C3=B6rklund wrote: >> Hi, >>=20 >> I think it is a matter of taste and perhaps future extensibility if >> this model is done as one or more YANG modules. It can certainly be >> done in one module, with features for client, server and relay, but = it >> is also ok to have 3 modules for the different functions. And once >> you have these 3 modules, it is natural to have a "common" module, >> leading to 4 modules. In order to keep the number of modules down, >> perhaps the various -options modules could be merged into the other >> 3, probably with a feature each. >>=20 >> One comment is that it might be wise to avoid having a rfc number in >> the identifier. What happens if/when that RFC is revised for any >> reason? >>=20 >>=20 >> /martin >>=20 >>=20 >> tom petch wrote: >>>=20 >>> Inline >>>=20 >>> From: Andy Bierman >>> Sent: 20 January 2021 18:32 >>>=20 >>> On Wed, Jan 20, 2021 at 8:41 AM tom petch = > wrote: >>> Juergen, Lada, Martin, Andy >>>=20 >>> I wonder if one of you, or perhaps another on this list, would be = willing to give advice on the >>> structuring of the YANG module for DHCP. It has been revised and = restructured several times and, to me, is not progressing. >>>=20 >>> It models three roles - client, server, relay - and a dozen optional = function which can appear in one or more roles. A node will likely have = only one role but may have many options. >>>=20 >>> There are, at present, seven modules >>> server which defines a server identity based on common identity = inter alia >>> relay which defines relay identity ditto >>> client which defines client identity ditto >>> server options which has groupings for each option for a server >>> client options which has groupings for each option for a relay >>> relay options which has groupings for each option for a client >>> common which defines the common identity inter alia >>> Since options are common across roles, some groupings are replicated = in the three options modules. Three separate option modules were = created to avoid problems with imports as Ian explains below. The I-D = is draft-ietf-dhc-dhcpv6-yang >>>=20 >>> My take is that one module is best, using 'when' or if-feature to = select, which is what I see with OSPF, PCE, TCP, IGMP and almost = everything else but am struggling to convince others, especially the = author Ian. [IF] in the e-mail extract below >>>=20 >>> I suggested asking a YANG Doctor, NOT to look at the module but = rather to advise on a structure given the requirements to which Ian said = that he had not had much joy with YANG Doctors. I append our most = recent exchange in which he responds to my query as to why there are = seven modules; formatting is a bit of a mess I am afraid. The posts are = to the DHCWG mail list. >>>=20 >>> Any advice appreciated even if it is that Ian is on just the right = track! >>>=20 >>>=20 >>> Either approach is valid so multi-module vs. single module w/ = features is more >>> of an overall system maintenance issue. 7 modules seems like a lot = for DHCP but >>> I have no objective criteria to back that up. >>>=20 >>> There is some confusion about the import-stmt, which leads to many = YANG modules. >>> In compiler terms, importing a module merely makes the symbols = available for parsing in the current module. >>> The import-stmt implies no conformance requirements whatsoever. >>> Only statements that use the imported module can do that. >>> (So a server module importing a module that has client groupings is = not actually a problem.) >>>=20 >>> >>>=20 >>> Andy, Juergen, >>>=20 >>> Thank you for the replies. What Ian said about the import is >>>=20 >>>> [IF] The separation of the option modules came at a later stage = based on import dependencies of a single options module. When the = options module imports the client/server/relay modules so it can augment = the relevant module based on identity, an implementation also needs to = import these modules and will declare them in it=E2=80=99s capabilities = as available even though it doesn=E2=80=99t implement them. Dividing the = options modules avoids the need for deviations. >>>=20 >>> that is, the prefix for dhcpv6-server is defined in the server = module, >>> module ietf-dhcpv6-server { >>> ... >>> prefix "dhcpv6-server"; >>> ... >>> identity server { >>> base "dhcpv6-common:dhcpv6-node"; >>> description "DHCPv6 server identity."; } >>> leaf dhcpv6-node-type { >>> type identityref { >>> base "dhcpv6-common:dhcpv6-node"; } >>> description "Type for a DHCPv6 server."; } >>>=20 >>> and the prefix for dhcpv6-relay in the relay module etc so having a = single module for options which needs to augment options to the server = module needs to import the server module so that the dhcpv6-server = prefix is defined, ditto relay and client so the single module for = options then imports server and relay and client modules. >>>=20 >>> With three options modules, each only imports one of server, relay, = client but the groupings are then replicated across the three options = modules. >>>=20 >>> Logical if you agree with the initial premise (which I do not!).=20 >>>=20 >>> The seven YANG modules are all in the one I-D of 56pp with the tree = diagrams 12pp. >>>=20 >>> Tom Petch >>> (on European time:-( >>>=20 >>> YANG Conformance for a single module is better defined than for = multiple related modules. >>> The YANG Packages work could fix that someday. >>>=20 >>> Tom Petch >>>=20 >>>=20 >>> Andy >>>=20 >>>=20 >>> On 19/01/2021 11:25, tom petch wrote: >>>> ________________________________________ >>>> From: dhcwg > = on behalf of ianfarrer@gmx.com = > >>>> Sent: 19 January 2021 07:37 >>>>=20 >>>> Thanks for your comments. Please see inline below. >>>>=20 >>>> Ian >>>>=20 >>>> On 14. Jan 2021, at 13:40, t petch = >> wrote: >>>>=20 >>>> Ian >>>>=20 >>>> I do not understand this I-D; I have tracked it for a number of = years and my understanding of it is diminishing. >>>>=20 >>>> Currently, it is seven YANG modules: why? >>>>=20 >>>> [if - The separation into client/server/relay, and DHCP options has = been in the draft since -05 and the changes were presented and discussed = at IETF101 - I=E2=80=99ve described the reasoning for this split in the = next answer. Beyond that, the common module was added to avoid (well = reduce as you point out below) duplication. >>>>=20 >>>> The separation of the option modules came at a later stage based on = import dependencies of a single options module. When the options module = imports the client/server/relay modules so it can augment the relevant = module based on identity, an implementation also needs to import these = modules and will declare them in it=E2=80=99s capabilities as available = even though it doesn=E2=80=99t implement them. Dividing the options = modules avoids the need for deviations. >>>>=20 >>>> Even though there are 7 modules defined here, the likely hood is = that an element implementation would require 3 modules to be implemented = (e.g. client, common and client options).] >>>>=20 >>>> [tp] Other WG have models with multiple roles and many options and = have a single YANG module, using the features of YANG to tailor the = module to different configurations. >>>>=20 >>>> [if - It=E2=80=99s not really tailoring the module to different = configurations, they are for the most part separate functional elements = in the network with any device only implementing one of the client, = relay or server functions. >>>>=20 >>>> However, even in the case that a device is both a server and a = client (e.g. a home gateway with a client on the WAN and a server on the = LAN), the likelihood is that these will be done using different software = implementations, so having separate modules for server and client offers = implementation flexibility. >>>>=20 >>>> In the case of a monolithic module with the relevant = client/relay/server functionality enabled by features, the module would = do nothing unless one or more of the features was enabled, and Is = unlikely that you=E2=80=99d ever enable more than one. Is this approach = used by other WGs? Could you point me to some some examples as I've only = seen features been used as relatively small optional extensions used = when the bulk of the nodes are common?] >>>=20 >>> [tp] >>> Ian >>>=20 >>> Almost all the YANG models I know of are single module. For = example, >>> draft-ietf-ospf-yang supports two versions modelled as identity and = 28 >>> options modelled as features. >>>=20 >>> draft-ietf-tcpm-yang supports client and server as containers with >>> if-feature and has other features as well >>>=20 >>> draft-ietf-pim-igmp-mld-yang supports five versions of two protocol >>> using identity >>>=20 >>> draft-pce-pcep-yang offers the roles of pcc or pce or both using = typedef. >>>=20 >>> And so on and so on. if-feature, when and suchlike provide the >>> necessary customisation. >>>=20 >>> I think that your problems with options are because the identity are >>> defined in the wrong place. The base, the common module (or part of = the >>> one and only module) should define what is common, what everyone = needs; >>> if there are three roles and a dozen options, than that is where = they >>> need to be defined. >>>=20 >>> Then there can be an object which is configured with the roles of a >>> particular box, client or server or relay, or if required, a = combination >>> of the there - simpler if that is out of scope as you suggest. >>>=20 >>> My starting point would be a dhc container with a leaf for a role = and then >>> containers for client, relay, server, added by augment and = controlled by >>> when pointing at the role. >>>=20 >>> I will post something to the netmod WG list - there are lots of = people >>> there with greater exposure than mine who can give better guidance = than I. >>>=20 >>> Tom Petch >>>=20 >>>> Here you have modelled the options as YANG grouping. The intent of = a grouping is to provide a block of statements that can be reused so = avoiding duplication with the attendant problems. Here you have the = same grouping in triplicate in three different YANG modules which seems = to me to be the antithesis of a grouping. >>>>=20 >>>> [If - We could move the option definitions for = "status-code-option-group=E2=80=9D (client, server, relay) and = =E2=80=9Crapid-commit-option-group, = vendor-specific-information-option-group; = reconfigure-accept-option-group=E2=80=9D (client, server) into the = common module to resolve the duplication. I didn=E2=80=99t do this = previously as the intention was to keep options definitions in the = options modules for consistency, but it would be simple to change. ] >>>>=20 >>>> [tp] Likewise I find the specification of server v client v relay = unusual. >>>>=20 >>>> [If - A similar approach for separated client/server modules is = also used in RFC8676, where the client and server have discrete = function, as with DHCP.] >>>>=20 >>>> [tp]I wonder if it is worth consulting a YANG doctor, NOT to show = them the YANG and invite comments, rather outline in an abstract way = what it is you want to model and see what they suggest; that might well = be a single YANG module. >>>>=20 >>>> [if - Yes, I=E2=80=99d be happy to. Is there someone that you have = in mind (I=E2=80=99ve not had much luck with getting YANG doctor input = outside of the formal review process in the past)?. I=E2=80=99m not = opposed to changing the way that the modules are structured on = principal, I do however, think that the separation by functional element = is logical and simpler for implementers, and I would like to know what = the benefits of a single module (or other structure) might be.] >>>>=20 >>>> [tp]I do have quite a number of detailed comments but do not think = them worth making until the I-D seems to me more stable. >>>>=20 >>>> [if - It=E2=80=99d be great if you could supply them as well so I = can start going though them and fixing what=E2=80=99s currently fixable = in parallel to the discussion above.] >>>>=20 >>>> Tom Petch >>>>=20 >>>> On 07/01/2021 16:10, = ianfarrer@gmx.com> wrote: >>>> Hi Tom, >>>>=20 >=20 > --=20 > Ladislav Lhotka > Head, CZ.NIC Labs > PGP Key ID: 0xB8F92B08A9F76C67 From nobody Thu Jan 21 08:59:53 2021 Return-Path: X-Original-To: netmod@ietfa.amsl.com Delivered-To: netmod@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id E73663A12D6 for ; 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Thu, 21 Jan 2021 16:59:46 +0000 From: tom petch To: Ladislav Lhotka , =?Windows-1252?Q?Martin_Bj=F6rklund?= CC: "andy@yumaworks.com" , "netmod@ietf.org" , "j.schoenwaelder@jacobs-university.de" , "ianfarrer@gmx.com" Thread-Topic: Structuring a DHCP module Thread-Index: AQHW70sVzeGJg/CSikuUFwnormzctaow1pyAgAEdNOWAABNGgIAABKIAgAA9LPI= Date: Thu, 21 Jan 2021 16:59:46 +0000 Message-ID: References: <20210121.134211.1244086498697136841.id@4668.se>, <77892263-e7f9-bef3-b9ab-cff36f382891@nic.cz> In-Reply-To: <77892263-e7f9-bef3-b9ab-cff36f382891@nic.cz> Accept-Language: en-GB, en-US Content-Language: en-GB X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: nic.cz; dkim=none (message not signed) header.d=none;nic.cz; dmarc=none action=none header.from=btconnect.com; x-originating-ip: [86.146.121.140] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: ada42368-fc69-4520-45dd-08d8be2df4e4 x-ms-traffictypediagnostic: AM6PR07MB5320: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; 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charset="Windows-1252" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: btconnect.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: AM7PR07MB6248.eurprd07.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: ada42368-fc69-4520-45dd-08d8be2df4e4 X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Jan 2021 16:59:46.2768 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: cf8853ed-96e5-465b-9185-806bfe185e30 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: oHg70zqkGHSEcRbYxg+DyjAk8ZxtH24JwFHD8gv3/TdXJjOZUDovLDJsb4Ede6Ws3KLWba2ndd+xDkyhehEUSA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM6PR07MB5320 Archived-At: Subject: Re: [netmod] Structuring a DHCP module X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Jan 2021 16:59:52 -0000 From: Ladislav Lhotka =0A= Sent: 21 January 2021 12:58=0A= =0A= Hi,=0A= =0A= in my YD review 4.5 years ago I actually recommended to use separate=0A= modules:=0A= =0A= https://mailarchive.ietf.org/arch/msg/yang-doctors/GXHkGqZeIidMzpziZmK_ICrK= Ps4/=0A= =0A= I think it is a matter of how much the different part overlap. For an=0A= implementer, it seems to be easier to pick just the relevant parts,=0A= provided they are easy to locate and identify.=0A= =0A= =0A= Thank you for all the responses; I did look at the data tracker to see if = there had been any reviews, thinking that a previous review would be the r= ight place to start, and it said 'No reviews'! Perhaps these time out.=0A= =0A= I am not comfortable with the seven modules seeing four as better, a common= which is then augmented with server, relay, client, with the common contai= ning the role(s), whereas at present it is the three role modules that cont= ain the role which then drives having the three option modules so each opti= on module only imports one role module, and that is the bit I find most awk= ward. =0A= =0A= How best to select the three roles? As I said upthread, I have seen the ro= le specified with features, with augment/when based on identityref (althoug= h not with the three identity defined in the three role modules), presence = containers and so on (I have probably seen that and more in the history of = this I-D:-).=0A= =0A= My instinct would be to put the three identity definitions into common with= a dhcpv6 container, which is then augmented by the three role modules, the= YANG 'when' referring to role leaf in the common. Any better ways? =0A= =0A= Tom Petch=0A= =0A= Lada=0A= =0A= On 21. 01. 21 13:42, Martin Bj=F6rklund wrote:=0A= > Hi,=0A= >=0A= > I think it is a matter of taste and perhaps future extensibility if=0A= > this model is done as one or more YANG modules. It can certainly be=0A= > done in one module, with features for client, server and relay, but it=0A= > is also ok to have 3 modules for the different functions. And once=0A= > you have these 3 modules, it is natural to have a "common" module,=0A= > leading to 4 modules. In order to keep the number of modules down,=0A= > perhaps the various -options modules could be merged into the other=0A= > 3, probably with a feature each.=0A= >=0A= > One comment is that it might be wise to avoid having a rfc number in=0A= > the identifier. What happens if/when that RFC is revised for any=0A= > reason?=0A= >=0A= >=0A= > /martin=0A= >=0A= >=0A= > tom petch wrote:=0A= >>=0A= >> Inline =0A= >>=0A= >> From: Andy Bierman =0A= >> Sent: 20 January 2021 18:32=0A= >>=0A= >> On Wed, Jan 20, 2021 at 8:41 AM tom petch > wrote:=0A= >> Juergen, Lada, Martin, Andy=0A= >>=0A= >> I wonder if one of you, or perhaps another on this list, would be willin= g to give advice on the=0A= >> structuring of the YANG module for DHCP. It has been revised and restr= uctured several times and, to me, is not progressing.=0A= >>=0A= >> It models three roles - client, server, relay - and a dozen optional fun= ction which can appear in one or more roles. A node will likely have only = one role but may have many options.=0A= >>=0A= >> There are, at present, seven modules=0A= >> server which defines a server identity based on common identity inter a= lia=0A= >> relay which defines relay identity ditto=0A= >> client which defines client identity ditto=0A= >> server options which has groupings for each option for a server=0A= >> client options which has groupings for each option for a relay=0A= >> relay options which has groupings for each option for a client=0A= >> common which defines the common identity inter alia=0A= >> Since options are common across roles, some groupings are replicated in = the three options modules. Three separate option modules were created to a= void problems with imports as Ian explains below. The I-D is draft-ietf-dh= c-dhcpv6-yang=0A= >>=0A= >> My take is that one module is best, using 'when' or if-feature to select= , which is what I see with OSPF, PCE, TCP, IGMP and almost everything else = but am struggling to convince others, especially the author Ian. [IF] in = the e-mail extract below=0A= >>=0A= >> I suggested asking a YANG Doctor, NOT to look at the module but rather t= o advise on a structure given the requirements to which Ian said that he ha= d not had much joy with YANG Doctors. I append our most recent exchange in= which he responds to my query as to why there are seven modules; formattin= g is a bit of a mess I am afraid. The posts are to the DHCWG mail list.=0A= >>=0A= >> Any advice appreciated even if it is that Ian is on just the right track= !=0A= >>=0A= >>=0A= >> Either approach is valid so multi-module vs. single module w/ features i= s more=0A= >> of an overall system maintenance issue. 7 modules seems like a lot for = DHCP but=0A= >> I have no objective criteria to back that up.=0A= >>=0A= >> There is some confusion about the import-stmt, which leads to many YANG = modules.=0A= >> In compiler terms, importing a module merely makes the symbols available= for parsing in the current module.=0A= >> The import-stmt implies no conformance requirements whatsoever.=0A= >> Only statements that use the imported module can do that.=0A= >> (So a server module importing a module that has client groupings is not = actually a problem.)=0A= >>=0A= >> =0A= >>=0A= >> Andy, Juergen,=0A= >>=0A= >> Thank you for the replies. What Ian said about the import is=0A= >>=0A= >>> [IF] The separation of the option modules came at a later stage based o= n import dependencies of a single options module. When the options module i= mports the client/server/relay modules so it can augment the relevant modul= e based on identity, an implementation also needs to import these modules a= nd will declare them in it=92s capabilities as available even though it doe= sn=92t implement them. Dividing the options modules avoids the need for dev= iations.=0A= >>=0A= >> that is, the prefix for dhcpv6-server is defined in the server modu= le,=0A= >> module ietf-dhcpv6-server {=0A= >> ...=0A= >> prefix "dhcpv6-server";=0A= >> ...=0A= >> identity server {=0A= >> base "dhcpv6-common:dhcpv6-node";=0A= >> description "DHCPv6 server identity."; }=0A= >> leaf dhcpv6-node-type {=0A= >> type identityref {=0A= >> base "dhcpv6-common:dhcpv6-node"; }=0A= >> description "Type for a DHCPv6 server."; }=0A= >>=0A= >> and the prefix for dhcpv6-relay in the relay module etc so having a sing= le module for options which needs to augment options to the server module n= eeds to import the server module so that the dhcpv6-server prefix is define= d, ditto relay and client so the single module for options then imports ser= ver and relay and client modules.=0A= >>=0A= >> With three options modules, each only imports one of server, relay, clie= nt but the groupings are then replicated across the three options modules.= =0A= >>=0A= >> Logical if you agree with the initial premise (which I do not!).=0A= >>=0A= >> The seven YANG modules are all in the one I-D of 56pp with the tree diag= rams 12pp.=0A= >>=0A= >> Tom Petch=0A= >> (on European time:-(=0A= >>=0A= >> YANG Conformance for a single module is better defined than for multiple= related modules.=0A= >> The YANG Packages work could fix that someday.=0A= >>=0A= >> Tom Petch=0A= >>=0A= >>=0A= >> Andy=0A= >>=0A= >>=0A= >> On 19/01/2021 11:25, tom petch wrote:=0A= >>> ________________________________________=0A= >>> From: dhcwg > on = behalf of ianfarrer@gmx.com >=0A= >>> Sent: 19 January 2021 07:37=0A= >>>=0A= >>> Thanks for your comments. Please see inline below.=0A= >>>=0A= >>> Ian=0A= >>>=0A= >>> On 14. Jan 2021, at 13:40, t petch >> wrote= :=0A= >>>=0A= >>> Ian=0A= >>>=0A= >>> I do not understand this I-D; I have tracked it for a number of years a= nd my understanding of it is diminishing.=0A= >>>=0A= >>> Currently, it is seven YANG modules: why?=0A= >>>=0A= >>> [if - The separation into client/server/relay, and DHCP options has bee= n in the draft since -05 and the changes were presented and discussed at IE= TF101 - I=92ve described the reasoning for this split in the next answer. B= eyond that, the common module was added to avoid (well reduce as you point = out below) duplication.=0A= >>>=0A= >>> The separation of the option modules came at a later stage based on imp= ort dependencies of a single options module. When the options module import= s the client/server/relay modules so it can augment the relevant module bas= ed on identity, an implementation also needs to import these modules and wi= ll declare them in it=92s capabilities as available even though it doesn=92= t implement them. Dividing the options modules avoids the need for deviatio= ns.=0A= >>>=0A= >>> Even though there are 7 modules defined here, the likely hood is that a= n element implementation would require 3 modules to be implemented (e.g. cl= ient, common and client options).]=0A= >>>=0A= >>> [tp] Other WG have models with multiple roles and many options and have= a single YANG module, using the features of YANG to tailor the module to d= ifferent configurations.=0A= >>>=0A= >>> [if - It=92s not really tailoring the module to different configuration= s, they are for the most part separate functional elements in the network w= ith any device only implementing one of the client, relay or server functio= ns.=0A= >>>=0A= >>> However, even in the case that a device is both a server and a client (= e.g. a home gateway with a client on the WAN and a server on the LAN), the = likelihood is that these will be done using different software implementati= ons, so having separate modules for server and client offers implementation= flexibility.=0A= >>>=0A= >>> In the case of a monolithic module with the relevant client/relay/serve= r functionality enabled by features, the module would do nothing unless one= or more of the features was enabled, and Is unlikely that you=92d ever ena= ble more than one. Is this approach used by other WGs? Could you point me t= o some some examples as I've only seen features been used as relatively sma= ll optional extensions used when the bulk of the nodes are common?]=0A= >>=0A= >> [tp]=0A= >> Ian=0A= >>=0A= >> Almost all the YANG models I know of are single module. For example,=0A= >> draft-ietf-ospf-yang supports two versions modelled as identity and 28= =0A= >> options modelled as features.=0A= >>=0A= >> draft-ietf-tcpm-yang supports client and server as containers with=0A= >> if-feature and has other features as well=0A= >>=0A= >> draft-ietf-pim-igmp-mld-yang supports five versions of two protocol=0A= >> using identity=0A= >>=0A= >> draft-pce-pcep-yang offers the roles of pcc or pce or both using typedef= .=0A= >>=0A= >> And so on and so on. if-feature, when and suchlike provide the=0A= >> necessary customisation.=0A= >>=0A= >> I think that your problems with options are because the identity are=0A= >> defined in the wrong place. The base, the common module (or part of the= =0A= >> one and only module) should define what is common, what everyone needs;= =0A= >> if there are three roles and a dozen options, than that is where they=0A= >> need to be defined.=0A= >>=0A= >> Then there can be an object which is configured with the roles of a=0A= >> particular box, client or server or relay, or if required, a combination= =0A= >> of the there - simpler if that is out of scope as you suggest.=0A= >>=0A= >> My starting point would be a dhc container with a leaf for a role and th= en=0A= >> containers for client, relay, server, added by augment and controlled by= =0A= >> when pointing at the role.=0A= >>=0A= >> I will post something to the netmod WG list - there are lots of people= =0A= >> there with greater exposure than mine who can give better guidance than = I.=0A= >>=0A= >> Tom Petch=0A= >>=0A= >>> Here you have modelled the options as YANG grouping. The intent of a gr= ouping is to provide a block of statements that can be reused so avoiding d= uplication with the attendant problems. Here you have the same grouping in= triplicate in three different YANG modules which seems to me to be the ant= ithesis of a grouping.=0A= >>>=0A= >>> [If - We could move the option definitions for "status-code-option-grou= p=94 (client, server, relay) and =93rapid-commit-option-group, vendor-speci= fic-information-option-group; reconfigure-accept-option-group=94 (client, s= erver) into the common module to resolve the duplication. I didn=92t do thi= s previously as the intention was to keep options definitions in the option= s modules for consistency, but it would be simple to change. ]=0A= >>>=0A= >>> [tp] Likewise I find the specification of server v client v relay unusu= al.=0A= >>>=0A= >>> [If - A similar approach for separated client/server modules is also us= ed in RFC8676, where the client and server have discrete function, as with = DHCP.]=0A= >>>=0A= >>> [tp]I wonder if it is worth consulting a YANG doctor, NOT to show them = the YANG and invite comments, rather outline in an abstract way what it is = you want to model and see what they suggest; that might well be a single YA= NG module.=0A= >>>=0A= >>> [if - Yes, I=92d be happy to. Is there someone that you have in mind (I= =92ve not had much luck with getting YANG doctor input outside of the forma= l review process in the past)?. I=92m not opposed to changing the way that = the modules are structured on principal, I do however, think that the separ= ation by functional element is logical and simpler for implementers, and I = would like to know what the benefits of a single module (or other structure= ) might be.]=0A= >>>=0A= >>> [tp]I do have quite a number of detailed comments but do not think them= worth making until the I-D seems to me more stable.=0A= >>>=0A= >>> [if - It=92d be great if you could supply them as well so I can start g= oing though them and fixing what=92s currently fixable in parallel to the d= iscussion above.]=0A= >>>=0A= >>> Tom Petch=0A= >>>=0A= >>> On 07/01/2021 16:10, ianfarrer@gmx.com> wrote:=0A= >>> Hi Tom,=0A= >>>=0A= =0A= --=0A= Ladislav Lhotka=0A= Head, CZ.NIC Labs=0A= PGP Key ID: 0xB8F92B08A9F76C67=0A= From nobody Thu Jan 21 09:08:06 2021 Return-Path: X-Original-To: netmod@ietfa.amsl.com Delivered-To: netmod@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by 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Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: btconnect.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: AM7PR07MB6248.eurprd07.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: b887c65e-dc2b-4b84-37d5-08d8be34caab X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Jan 2021 17:48:41.9167 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: cf8853ed-96e5-465b-9185-806bfe185e30 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: GWWdAXFSu4UxK3ZpPGMx+6K1F2QSGCOMnTu/o56fAl/YPDV8EALG9AV8MY6JmZFhDJBTNslGFgc4Aus15TDupQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM6PR07MB5107 Archived-At: Subject: Re: [netmod] Structuring a DHCP module X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Jan 2021 17:48:50 -0000 From: Martin Bj=F6rklund =0A= Sent: 21 January 2021 17:07=0A= =0A= tom petch wrote:=0A= > From: Ladislav Lhotka =0A= > Sent: 21 January 2021 12:58=0A= >=0A= > Hi,=0A= >=0A= > in my YD review 4.5 years ago I actually recommended to use separate=0A= > modules:=0A= >=0A= > https://mailarchive.ietf.org/arch/msg/yang-doctors/GXHkGqZeIidMzpziZmK_IC= rKPs4/=0A= >=0A= > I think it is a matter of how much the different part overlap. For an=0A= > implementer, it seems to be easier to pick just the relevant parts,=0A= > provided they are easy to locate and identify.=0A= >=0A= > =0A= > Thank you for all the responses; I did look at the data tracker to see i= f there had been any reviews, thinking that a previous review would be the= right place to start, and it said 'No reviews'! Perhaps these time out.= =0A= >=0A= > I am not comfortable with the seven modules seeing four as better, a comm= on which is then augmented with server, relay, client, with the common cont= aining the role(s), whereas at present it is the three role modules that co= ntain the role which then drives having the three option modules so each op= tion module only imports one role module, and that is the bit I find most a= wkward.=0A= >=0A= > How best to select the three roles? As I said upthread, I have seen the = role specified with features, with augment/when based on identityref (altho= ugh not with the three identity defined in the three role modules), presenc= e containers and so on (I have probably seen that and more in the history o= f this I-D:-).=0A= =0A= Is "role" the same as "node-type"? Each of these module define their=0A= own copy of a leaf called "dhcpv6-node-type". I am not sure I=0A= understand what purpose this leaf serves. It seems to me that it can=0A= be removed, but perhaps I am missing something.=0A= =0A= =0A= =0A= Me too. I am assuming that it is intended to define the role but I could b= e quite wrong. Need input from Ian on this.=0A= =0A= > My instinct would be to put the three identity definitions into common wi= th a dhcpv6 container, which is then augmented by the three role modules, t= he YANG 'when' referring to role leaf in the common. Any better ways?=0A= =0A= Why do augment at all? Why not just have a top-level container in=0A= each module; 'dhcpv6-client', 'dhcpv6-server' etc?=0A= =0A= =0A= Yes, I am just lifting the structure of another I-D probably for no good en= gineering reason:-(.=0A= =0A= Tom Petch=0A= =0A= /martin=0A= =0A= =0A= =0A= >=0A= > Tom Petch=0A= >=0A= > Lada=0A= >=0A= > On 21. 01. 21 13:42, Martin Bj=F6rklund wrote:=0A= > > Hi,=0A= > >=0A= > > I think it is a matter of taste and perhaps future extensibility if=0A= > > this model is done as one or more YANG modules. It can certainly be=0A= > > done in one module, with features for client, server and relay, but it= =0A= > > is also ok to have 3 modules for the different functions. And once=0A= > > you have these 3 modules, it is natural to have a "common" module,=0A= > > leading to 4 modules. In order to keep the number of modules down,=0A= > > perhaps the various -options modules could be merged into the other=0A= > > 3, probably with a feature each.=0A= > >=0A= > > One comment is that it might be wise to avoid having a rfc number in=0A= > > the identifier. What happens if/when that RFC is revised for any=0A= > > reason?=0A= > >=0A= > >=0A= > > /martin=0A= > >=0A= > >=0A= > > tom petch wrote:=0A= > >>=0A= > >> Inline =0A= > >>=0A= > >> From: Andy Bierman =0A= > >> Sent: 20 January 2021 18:32=0A= > >>=0A= > >> On Wed, Jan 20, 2021 at 8:41 AM tom petch > wrote:=0A= > >> Juergen, Lada, Martin, Andy=0A= > >>=0A= > >> I wonder if one of you, or perhaps another on this list, would be will= ing to give advice on the=0A= > >> structuring of the YANG module for DHCP. It has been revised and res= tructured several times and, to me, is not progressing.=0A= > >>=0A= > >> It models three roles - client, server, relay - and a dozen optional f= unction which can appear in one or more roles. A node will likely have onl= y one role but may have many options.=0A= > >>=0A= > >> There are, at present, seven modules=0A= > >> server which defines a server identity based on common identity inter= alia=0A= > >> relay which defines relay identity ditto=0A= > >> client which defines client identity ditto=0A= > >> server options which has groupings for each option for a server=0A= > >> client options which has groupings for each option for a relay=0A= > >> relay options which has groupings for each option for a client=0A= > >> common which defines the common identity inter alia=0A= > >> Since options are common across roles, some groupings are replicated i= n the three options modules. Three separate option modules were created to= avoid problems with imports as Ian explains below. The I-D is draft-ietf-= dhc-dhcpv6-yang=0A= > >>=0A= > >> My take is that one module is best, using 'when' or if-feature to sele= ct, which is what I see with OSPF, PCE, TCP, IGMP and almost everything els= e but am struggling to convince others, especially the author Ian. [IF] i= n the e-mail extract below=0A= > >>=0A= > >> I suggested asking a YANG Doctor, NOT to look at the module but rather= to advise on a structure given the requirements to which Ian said that he = had not had much joy with YANG Doctors. I append our most recent exchange = in which he responds to my query as to why there are seven modules; formatt= ing is a bit of a mess I am afraid. The posts are to the DHCWG mail list.= =0A= > >>=0A= > >> Any advice appreciated even if it is that Ian is on just the right tra= ck!=0A= > >>=0A= > >>=0A= > >> Either approach is valid so multi-module vs. single module w/ features= is more=0A= > >> of an overall system maintenance issue. 7 modules seems like a lot fo= r DHCP but=0A= > >> I have no objective criteria to back that up.=0A= > >>=0A= > >> There is some confusion about the import-stmt, which leads to many YAN= G modules.=0A= > >> In compiler terms, importing a module merely makes the symbols availab= le for parsing in the current module.=0A= > >> The import-stmt implies no conformance requirements whatsoever.=0A= > >> Only statements that use the imported module can do that.=0A= > >> (So a server module importing a module that has client groupings is no= t actually a problem.)=0A= > >>=0A= > >> =0A= > >>=0A= > >> Andy, Juergen,=0A= > >>=0A= > >> Thank you for the replies. What Ian said about the import is=0A= > >>=0A= > >>> [IF] The separation of the option modules came at a later stage based= on import dependencies of a single options module. When the options module= imports the client/server/relay modules so it can augment the relevant mod= ule based on identity, an implementation also needs to import these modules= and will declare them in it=92s capabilities as available even though it d= oesn=92t implement them. Dividing the options modules avoids the need for d= eviations.=0A= > >>=0A= > >> that is, the prefix for dhcpv6-server is defined in the server mo= dule,=0A= > >> module ietf-dhcpv6-server {=0A= > >> ...=0A= > >> prefix "dhcpv6-server";=0A= > >> ...=0A= > >> identity server {=0A= > >> base "dhcpv6-common:dhcpv6-node";=0A= > >> description "DHCPv6 server identity."; }=0A= > >> leaf dhcpv6-node-type {=0A= > >> type identityref {=0A= > >> base "dhcpv6-common:dhcpv6-node"; }=0A= > >> description "Type for a DHCPv6 server."; }=0A= > >>=0A= > >> and the prefix for dhcpv6-relay in the relay module etc so having a si= ngle module for options which needs to augment options to the server module= needs to import the server module so that the dhcpv6-server prefix is defi= ned, ditto relay and client so the single module for options then imports s= erver and relay and client modules.=0A= > >>=0A= > >> With three options modules, each only imports one of server, relay, cl= ient but the groupings are then replicated across the three options modules= .=0A= > >>=0A= > >> Logical if you agree with the initial premise (which I do not!).=0A= > >>=0A= > >> The seven YANG modules are all in the one I-D of 56pp with the tree di= agrams 12pp.=0A= > >>=0A= > >> Tom Petch=0A= > >> (on European time:-(=0A= > >>=0A= > >> YANG Conformance for a single module is better defined than for multip= le related modules.=0A= > >> The YANG Packages work could fix that someday.=0A= > >>=0A= > >> Tom Petch=0A= > >>=0A= > >>=0A= > >> Andy=0A= > >>=0A= > >>=0A= > >> On 19/01/2021 11:25, tom petch wrote:=0A= > >>> ________________________________________=0A= > >>> From: dhcwg > o= n behalf of ianfarrer@gmx.com >=0A= > >>> Sent: 19 January 2021 07:37=0A= > >>>=0A= > >>> Thanks for your comments. Please see inline below.=0A= > >>>=0A= > >>> Ian=0A= > >>>=0A= > >>> On 14. Jan 2021, at 13:40, t petch >> wro= te:=0A= > >>>=0A= > >>> Ian=0A= > >>>=0A= > >>> I do not understand this I-D; I have tracked it for a number of years= and my understanding of it is diminishing.=0A= > >>>=0A= > >>> Currently, it is seven YANG modules: why?=0A= > >>>=0A= > >>> [if - The separation into client/server/relay, and DHCP options has b= een in the draft since -05 and the changes were presented and discussed at = IETF101 - I=92ve described the reasoning for this split in the next answer.= Beyond that, the common module was added to avoid (well reduce as you poin= t out below) duplication.=0A= > >>>=0A= > >>> The separation of the option modules came at a later stage based on i= mport dependencies of a single options module. When the options module impo= rts the client/server/relay modules so it can augment the relevant module b= ased on identity, an implementation also needs to import these modules and = will declare them in it=92s capabilities as available even though it doesn= =92t implement them. Dividing the options modules avoids the need for devia= tions.=0A= > >>>=0A= > >>> Even though there are 7 modules defined here, the likely hood is that= an element implementation would require 3 modules to be implemented (e.g. = client, common and client options).]=0A= > >>>=0A= > >>> [tp] Other WG have models with multiple roles and many options and ha= ve a single YANG module, using the features of YANG to tailor the module to= different configurations.=0A= > >>>=0A= > >>> [if - It=92s not really tailoring the module to different configurati= ons, they are for the most part separate functional elements in the network= with any device only implementing one of the client, relay or server funct= ions.=0A= > >>>=0A= > >>> However, even in the case that a device is both a server and a client= (e.g. a home gateway with a client on the WAN and a server on the LAN), th= e likelihood is that these will be done using different software implementa= tions, so having separate modules for server and client offers implementati= on flexibility.=0A= > >>>=0A= > >>> In the case of a monolithic module with the relevant client/relay/ser= ver functionality enabled by features, the module would do nothing unless o= ne or more of the features was enabled, and Is unlikely that you=92d ever e= nable more than one. Is this approach used by other WGs? Could you point me= to some some examples as I've only seen features been used as relatively s= mall optional extensions used when the bulk of the nodes are common?]=0A= > >>=0A= > >> [tp]=0A= > >> Ian=0A= > >>=0A= > >> Almost all the YANG models I know of are single module. For example,= =0A= > >> draft-ietf-ospf-yang supports two versions modelled as identity and 28= =0A= > >> options modelled as features.=0A= > >>=0A= > >> draft-ietf-tcpm-yang supports client and server as containers with=0A= > >> if-feature and has other features as well=0A= > >>=0A= > >> draft-ietf-pim-igmp-mld-yang supports five versions of two protocol=0A= > >> using identity=0A= > >>=0A= > >> draft-pce-pcep-yang offers the roles of pcc or pce or both using typed= ef.=0A= > >>=0A= > >> And so on and so on. if-feature, when and suchlike provide the=0A= > >> necessary customisation.=0A= > >>=0A= > >> I think that your problems with options are because the identity are= =0A= > >> defined in the wrong place. The base, the common module (or part of t= he=0A= > >> one and only module) should define what is common, what everyone needs= ;=0A= > >> if there are three roles and a dozen options, than that is where they= =0A= > >> need to be defined.=0A= > >>=0A= > >> Then there can be an object which is configured with the roles of a=0A= > >> particular box, client or server or relay, or if required, a combinati= on=0A= > >> of the there - simpler if that is out of scope as you suggest.=0A= > >>=0A= > >> My starting point would be a dhc container with a leaf for a role and = then=0A= > >> containers for client, relay, server, added by augment and controlled = by=0A= > >> when pointing at the role.=0A= > >>=0A= > >> I will post something to the netmod WG list - there are lots of people= =0A= > >> there with greater exposure than mine who can give better guidance tha= n I.=0A= > >>=0A= > >> Tom Petch=0A= > >>=0A= > >>> Here you have modelled the options as YANG grouping. The intent of a = grouping is to provide a block of statements that can be reused so avoiding= duplication with the attendant problems. Here you have the same grouping = in triplicate in three different YANG modules which seems to me to be the a= ntithesis of a grouping.=0A= > >>>=0A= > >>> [If - We could move the option definitions for "status-code-option-gr= oup=94 (client, server, relay) and =93rapid-commit-option-group, vendor-spe= cific-information-option-group; reconfigure-accept-option-group=94 (client,= server) into the common module to resolve the duplication. I didn=92t do t= his previously as the intention was to keep options definitions in the opti= ons modules for consistency, but it would be simple to change. ]=0A= > >>>=0A= > >>> [tp] Likewise I find the specification of server v client v relay unu= sual.=0A= > >>>=0A= > >>> [If - A similar approach for separated client/server modules is also = used in RFC8676, where the client and server have discrete function, as wit= h DHCP.]=0A= > >>>=0A= > >>> [tp]I wonder if it is worth consulting a YANG doctor, NOT to show the= m the YANG and invite comments, rather outline in an abstract way what it i= s you want to model and see what they suggest; that might well be a single = YANG module.=0A= > >>>=0A= > >>> [if - Yes, I=92d be happy to. Is there someone that you have in mind = (I=92ve not had much luck with getting YANG doctor input outside of the for= mal review process in the past)?. I=92m not opposed to changing the way tha= t the modules are structured on principal, I do however, think that the sep= aration by functional element is logical and simpler for implementers, and = I would like to know what the benefits of a single module (or other structu= re) might be.]=0A= > >>>=0A= > >>> [tp]I do have quite a number of detailed comments but do not think th= em worth making until the I-D seems to me more stable.=0A= > >>>=0A= > >>> [if - It=92d be great if you could supply them as well so I can start= going though them and fixing what=92s currently fixable in parallel to the= discussion above.]=0A= > >>>=0A= > >>> Tom Petch=0A= > >>>=0A= > >>> On 07/01/2021 16:10, ianfarrer@gmx.com> wrote:=0A= > >>> Hi Tom,=0A= > >>>=0A= >=0A= > --=0A= > Ladislav Lhotka=0A= > Head, CZ.NIC Labs=0A= > PGP Key ID: 0xB8F92B08A9F76C67=0A= From nobody Thu Jan 21 23:34:08 2021 Return-Path: X-Original-To: netmod@ietfa.amsl.com Delivered-To: netmod@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id DB3DC3A0BF7 for ; Thu, 21 Jan 2021 23:34:06 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -1.918 X-Spam-Level: X-Spam-Status: No, score=-1.918 tagged_above=-999 required=5 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=gmx.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 198adW7sLanc for ; Thu, 21 Jan 2021 23:34:03 -0800 (PST) Received: from mout.gmx.net (mout.gmx.net [212.227.15.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id 932393A0C33 for ; Thu, 21 Jan 2021 23:34:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1611300826; bh=P5HF773EEDJg5k1NX8nYMHGBZ4fH1qcHtkGD8l5elms=; h=X-UI-Sender-Class:Subject:From:In-Reply-To:Date:Cc:References:To; b=hA7bDPbnH1AEmBSEpHzW5pagg2K98V61JB0rRGPtUjKY5tzIiwbdcn8lkVABVV84m yZnreRlZ2VcB75zq1ktUqHvrZCvFKNG3zl4H1uKYUpf4I6hpNoBO5fNTLxPpFCpsuk hQL8a8z3ktNNucA6YYZA5X0CCAiHJvNpWi4LDI2I= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from mbp-big-sur.fritz.box ([78.35.205.160]) by mail.gmx.net (mrgmx004 [212.227.17.184]) with ESMTPSA (Nemesis) id 1MJE6L-1lHtcv2I4R-00KdKN; Fri, 22 Jan 2021 08:33:46 +0100 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.40.0.2.32\)) From: ianfarrer@gmx.com In-Reply-To: Date: Fri, 22 Jan 2021 08:33:43 +0100 Cc: =?utf-8?Q?Martin_Bj=C3=B6rklund?= , "ladislav.lhotka@nic.cz" , "andy@yumaworks.com" , "netmod@ietf.org" , "j.schoenwaelder@jacobs-university.de" Content-Transfer-Encoding: quoted-printable Message-Id: <22C508AF-39A8-4F14-BB7E-3B47BBA96C64@gmx.com> References: <20210121.134211.1244086498697136841.id@4668.se> <77892263-e7f9-bef3-b9ab-cff36f382891@nic.cz> <20210121.180757.1756334498885863433.id@4668.se> To: tom petch X-Mailer: Apple Mail (2.3654.40.0.2.32) X-Provags-ID: V03:K1:fdgakXWP9wSjSbOpRqoAvgoR35jjfgl5LhM/gK5nfZZOhl+f8gP kq8k6xf9QTZQLThMLYoriV6GB4hetBkb4HzhFWYiZyVugpHy8RS9VcLv+WyYyuTdm/SKGGP 59ZnjatbYBMgVmcCw73ptLd6Ao00q01bzXd0p22xIBsI+xSjPBwc7nF63T3ARwJeEapYzOv S1JBicdjQ7kn9Miz1vTzg== X-UI-Out-Filterresults: notjunk:1;V03:K0:9IsXzGGNWKs=:WvCLGZKDaqR4y8UtdTGHwH TvCJ9gbsWJEuw0LO4Ie/KjDaiUw9M9HtY7HZYh3DuohBapy2PjRYt5vLTE6ItQnKG8Tomm82s i2DUsSnDzJxwQGTDF2ofELJ14m0SKA/iNNvhwXJt/j8ISKzViD8ovDMHdilG/D1UOwr69pzmc 08ARI3UILmkd18bfu0hz5zOEsuaXGeR3jwks+D4rMdLxG1Jx4bTjupupo/jvGMRm+933RY3iL qzxVbUmnu4Hpgfq5494JF1k1dZ+QK2n4Woxfm0EWonYQR8PAQPE6oYbQkHm5DnNr1D4zL3s/s F8zRvuuqyb88otw37nQtCCg6JRt5HkqOtCMuJIruzjxGcPHOWHS97myrlW09WAvQ3woVkP0gj KTnXdD92iXAHPIPC9v033e/YfaebGfMo156znUFAUUgZpyLHiMMcFJBpIuqUBA99bPWFR56vm YfqLQiwqc7NhdsQwIgKoIY/TVaPDq/qI9U8+grpe/ss+0F2pX0MuwKtmYWShRHpTEuWQe1TEw VnyyTl0UKLXMRW+LR5oKNtto42kp6B3OWd89khuKYfAqHnWnZgYuzOCO6cfO3MI6SoOIe+1oH 0rCwbr0ilPNzTR8exI4gZK/7VGbU2Ym26UvajDCiqnMvDxvR/nAhEnbj0MGNNWx/7h5A+JUba JarTCM15xrpRCEkvfOZHtUBnBwScdJBnJal1Qrq1w9xo6A/n+CO8eu7FTgT+X0aRlagdX48Hd qX7Tohyb64ppJ0G/S6hGiwNpL2WwGu6n8UAAH1gLru3lVhCuNmPsBaJlQnrJP8DVeYvYuQP5w yH11KU8FMV8XA8bL2U2S9KwRiphG91H7bKo93o/hT5Y1TJjPf7rKdAXi1ufqvFkSM3eXG1JtS Ci0LUijOMVD7+UiwZzbw== Archived-At: Subject: Re: [netmod] Structuring a DHCP module X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 22 Jan 2021 07:34:07 -0000 I=E2=80=99m planning to restructure so that the common module is = imported by client, server and relay, which means that the identity/role = is no longer needed for this. (I need to look at whether the identities = are needed for other reasons, such as how the modules will be extended = with additional option definitions etc.). This seems simpler to me and = avoids the common module needing to import all 3 of the other modules = with the dependency problems that introduces. Ian > On 21. Jan 2021, at 18:48, tom petch wrote: >=20 > From: Martin Bj=C3=B6rklund > Sent: 21 January 2021 17:07 >=20 > tom petch wrote: >> From: Ladislav Lhotka >> Sent: 21 January 2021 12:58 >>=20 >> Hi, >>=20 >> in my YD review 4.5 years ago I actually recommended to use separate >> modules: >>=20 >> = https://mailarchive.ietf.org/arch/msg/yang-doctors/GXHkGqZeIidMzpziZmK_ICr= KPs4/ >>=20 >> I think it is a matter of how much the different part overlap. For an >> implementer, it seems to be easier to pick just the relevant parts, >> provided they are easy to locate and identify. >>=20 >> >> Thank you for all the responses; I did look at the data tracker to = see if there had been any reviews, thinking that a previous review would = be the right place to start, and it said 'No reviews'! Perhaps these = time out. >>=20 >> I am not comfortable with the seven modules seeing four as better, a = common which is then augmented with server, relay, client, with the = common containing the role(s), whereas at present it is the three role = modules that contain the role which then drives having the three option = modules so each option module only imports one role module, and that is = the bit I find most awkward. >>=20 >> How best to select the three roles? As I said upthread, I have seen = the role specified with features, with augment/when based on identityref = (although not with the three identity defined in the three role = modules), presence containers and so on (I have probably seen that and = more in the history of this I-D:-). >=20 > Is "role" the same as "node-type"? Each of these module define their > own copy of a leaf called "dhcpv6-node-type". I am not sure I > understand what purpose this leaf serves. It seems to me that it can > be removed, but perhaps I am missing something. >=20 > >=20 > Me too. I am assuming that it is intended to define the role but I = could be quite wrong. Need input from Ian on this. >=20 >> My instinct would be to put the three identity definitions into = common with a dhcpv6 container, which is then augmented by the three = role modules, the YANG 'when' referring to role leaf in the common. Any = better ways? >=20 > Why do augment at all? Why not just have a top-level container in > each module; 'dhcpv6-client', 'dhcpv6-server' etc? >=20 > > Yes, I am just lifting the structure of another I-D probably for no = good engineering reason:-(. >=20 > Tom Petch >=20 > /martin >=20 >=20 >=20 >>=20 >> Tom Petch >>=20 >> Lada >>=20 >> On 21. 01. 21 13:42, Martin Bj=C3=B6rklund wrote: >>> Hi, >>>=20 >>> I think it is a matter of taste and perhaps future extensibility if >>> this model is done as one or more YANG modules. It can certainly be >>> done in one module, with features for client, server and relay, but = it >>> is also ok to have 3 modules for the different functions. And once >>> you have these 3 modules, it is natural to have a "common" module, >>> leading to 4 modules. In order to keep the number of modules down, >>> perhaps the various -options modules could be merged into the other >>> 3, probably with a feature each. >>>=20 >>> One comment is that it might be wise to avoid having a rfc number in >>> the identifier. What happens if/when that RFC is revised for any >>> reason? >>>=20 >>>=20 >>> /martin >>>=20 >>>=20 >>> tom petch wrote: >>>>=20 >>>> Inline >>>>=20 >>>> From: Andy Bierman >>>> Sent: 20 January 2021 18:32 >>>>=20 >>>> On Wed, Jan 20, 2021 at 8:41 AM tom petch = > wrote: >>>> Juergen, Lada, Martin, Andy >>>>=20 >>>> I wonder if one of you, or perhaps another on this list, would be = willing to give advice on the >>>> structuring of the YANG module for DHCP. It has been revised and = restructured several times and, to me, is not progressing. >>>>=20 >>>> It models three roles - client, server, relay - and a dozen = optional function which can appear in one or more roles. A node will = likely have only one role but may have many options. >>>>=20 >>>> There are, at present, seven modules >>>> server which defines a server identity based on common identity = inter alia >>>> relay which defines relay identity ditto >>>> client which defines client identity ditto >>>> server options which has groupings for each option for a server >>>> client options which has groupings for each option for a relay >>>> relay options which has groupings for each option for a client >>>> common which defines the common identity inter alia >>>> Since options are common across roles, some groupings are = replicated in the three options modules. Three separate option modules = were created to avoid problems with imports as Ian explains below. The = I-D is draft-ietf-dhc-dhcpv6-yang >>>>=20 >>>> My take is that one module is best, using 'when' or if-feature to = select, which is what I see with OSPF, PCE, TCP, IGMP and almost = everything else but am struggling to convince others, especially the = author Ian. [IF] in the e-mail extract below >>>>=20 >>>> I suggested asking a YANG Doctor, NOT to look at the module but = rather to advise on a structure given the requirements to which Ian said = that he had not had much joy with YANG Doctors. I append our most = recent exchange in which he responds to my query as to why there are = seven modules; formatting is a bit of a mess I am afraid. The posts are = to the DHCWG mail list. >>>>=20 >>>> Any advice appreciated even if it is that Ian is on just the right = track! >>>>=20 >>>>=20 >>>> Either approach is valid so multi-module vs. single module w/ = features is more >>>> of an overall system maintenance issue. 7 modules seems like a lot = for DHCP but >>>> I have no objective criteria to back that up. >>>>=20 >>>> There is some confusion about the import-stmt, which leads to many = YANG modules. >>>> In compiler terms, importing a module merely makes the symbols = available for parsing in the current module. >>>> The import-stmt implies no conformance requirements whatsoever. >>>> Only statements that use the imported module can do that. >>>> (So a server module importing a module that has client groupings is = not actually a problem.) >>>>=20 >>>> >>>>=20 >>>> Andy, Juergen, >>>>=20 >>>> Thank you for the replies. What Ian said about the import is >>>>=20 >>>>> [IF] The separation of the option modules came at a later stage = based on import dependencies of a single options module. When the = options module imports the client/server/relay modules so it can augment = the relevant module based on identity, an implementation also needs to = import these modules and will declare them in it=E2=80=99s capabilities = as available even though it doesn=E2=80=99t implement them. Dividing the = options modules avoids the need for deviations. >>>>=20 >>>> that is, the prefix for dhcpv6-server is defined in the server = module, >>>> module ietf-dhcpv6-server { >>>> ... >>>> prefix "dhcpv6-server"; >>>> ... >>>> identity server { >>>> base "dhcpv6-common:dhcpv6-node"; >>>> description "DHCPv6 server identity."; } >>>> leaf dhcpv6-node-type { >>>> type identityref { >>>> base "dhcpv6-common:dhcpv6-node"; } >>>> description "Type for a DHCPv6 server."; } >>>>=20 >>>> and the prefix for dhcpv6-relay in the relay module etc so having a = single module for options which needs to augment options to the server = module needs to import the server module so that the dhcpv6-server = prefix is defined, ditto relay and client so the single module for = options then imports server and relay and client modules. >>>>=20 >>>> With three options modules, each only imports one of server, relay, = client but the groupings are then replicated across the three options = modules. >>>>=20 >>>> Logical if you agree with the initial premise (which I do not!). >>>>=20 >>>> The seven YANG modules are all in the one I-D of 56pp with the tree = diagrams 12pp. >>>>=20 >>>> Tom Petch >>>> (on European time:-( >>>>=20 >>>> YANG Conformance for a single module is better defined than for = multiple related modules. >>>> The YANG Packages work could fix that someday. >>>>=20 >>>> Tom Petch >>>>=20 >>>>=20 >>>> Andy >>>>=20 >>>>=20 >>>> On 19/01/2021 11:25, tom petch wrote: >>>>> ________________________________________ >>>>> From: dhcwg = > on behalf of = ianfarrer@gmx.com = > >>>>> Sent: 19 January 2021 07:37 >>>>>=20 >>>>> Thanks for your comments. Please see inline below. >>>>>=20 >>>>> Ian >>>>>=20 >>>>> On 14. Jan 2021, at 13:40, t petch = >> wrote: >>>>>=20 >>>>> Ian >>>>>=20 >>>>> I do not understand this I-D; I have tracked it for a number of = years and my understanding of it is diminishing. >>>>>=20 >>>>> Currently, it is seven YANG modules: why? >>>>>=20 >>>>> [if - The separation into client/server/relay, and DHCP options = has been in the draft since -05 and the changes were presented and = discussed at IETF101 - I=E2=80=99ve described the reasoning for this = split in the next answer. Beyond that, the common module was added to = avoid (well reduce as you point out below) duplication. >>>>>=20 >>>>> The separation of the option modules came at a later stage based = on import dependencies of a single options module. When the options = module imports the client/server/relay modules so it can augment the = relevant module based on identity, an implementation also needs to = import these modules and will declare them in it=E2=80=99s capabilities = as available even though it doesn=E2=80=99t implement them. Dividing the = options modules avoids the need for deviations. >>>>>=20 >>>>> Even though there are 7 modules defined here, the likely hood is = that an element implementation would require 3 modules to be implemented = (e.g. client, common and client options).] >>>>>=20 >>>>> [tp] Other WG have models with multiple roles and many options and = have a single YANG module, using the features of YANG to tailor the = module to different configurations. >>>>>=20 >>>>> [if - It=E2=80=99s not really tailoring the module to different = configurations, they are for the most part separate functional elements = in the network with any device only implementing one of the client, = relay or server functions. >>>>>=20 >>>>> However, even in the case that a device is both a server and a = client (e.g. a home gateway with a client on the WAN and a server on the = LAN), the likelihood is that these will be done using different software = implementations, so having separate modules for server and client offers = implementation flexibility. >>>>>=20 >>>>> In the case of a monolithic module with the relevant = client/relay/server functionality enabled by features, the module would = do nothing unless one or more of the features was enabled, and Is = unlikely that you=E2=80=99d ever enable more than one. Is this approach = used by other WGs? Could you point me to some some examples as I've only = seen features been used as relatively small optional extensions used = when the bulk of the nodes are common?] >>>>=20 >>>> [tp] >>>> Ian >>>>=20 >>>> Almost all the YANG models I know of are single module. For = example, >>>> draft-ietf-ospf-yang supports two versions modelled as identity and = 28 >>>> options modelled as features. >>>>=20 >>>> draft-ietf-tcpm-yang supports client and server as containers with >>>> if-feature and has other features as well >>>>=20 >>>> draft-ietf-pim-igmp-mld-yang supports five versions of two protocol >>>> using identity >>>>=20 >>>> draft-pce-pcep-yang offers the roles of pcc or pce or both using = typedef. >>>>=20 >>>> And so on and so on. if-feature, when and suchlike provide the >>>> necessary customisation. >>>>=20 >>>> I think that your problems with options are because the identity = are >>>> defined in the wrong place. The base, the common module (or part = of the >>>> one and only module) should define what is common, what everyone = needs; >>>> if there are three roles and a dozen options, than that is where = they >>>> need to be defined. >>>>=20 >>>> Then there can be an object which is configured with the roles of a >>>> particular box, client or server or relay, or if required, a = combination >>>> of the there - simpler if that is out of scope as you suggest. >>>>=20 >>>> My starting point would be a dhc container with a leaf for a role = and then >>>> containers for client, relay, server, added by augment and = controlled by >>>> when pointing at the role. >>>>=20 >>>> I will post something to the netmod WG list - there are lots of = people >>>> there with greater exposure than mine who can give better guidance = than I. >>>>=20 >>>> Tom Petch >>>>=20 >>>>> Here you have modelled the options as YANG grouping. The intent of = a grouping is to provide a block of statements that can be reused so = avoiding duplication with the attendant problems. Here you have the = same grouping in triplicate in three different YANG modules which seems = to me to be the antithesis of a grouping. >>>>>=20 >>>>> [If - We could move the option definitions for = "status-code-option-group=E2=80=9D (client, server, relay) and = =E2=80=9Crapid-commit-option-group, = vendor-specific-information-option-group; = reconfigure-accept-option-group=E2=80=9D (client, server) into the = common module to resolve the duplication. I didn=E2=80=99t do this = previously as the intention was to keep options definitions in the = options modules for consistency, but it would be simple to change. ] >>>>>=20 >>>>> [tp] Likewise I find the specification of server v client v relay = unusual. >>>>>=20 >>>>> [If - A similar approach for separated client/server modules is = also used in RFC8676, where the client and server have discrete = function, as with DHCP.] >>>>>=20 >>>>> [tp]I wonder if it is worth consulting a YANG doctor, NOT to show = them the YANG and invite comments, rather outline in an abstract way = what it is you want to model and see what they suggest; that might well = be a single YANG module. >>>>>=20 >>>>> [if - Yes, I=E2=80=99d be happy to. Is there someone that you have = in mind (I=E2=80=99ve not had much luck with getting YANG doctor input = outside of the formal review process in the past)?. I=E2=80=99m not = opposed to changing the way that the modules are structured on = principal, I do however, think that the separation by functional element = is logical and simpler for implementers, and I would like to know what = the benefits of a single module (or other structure) might be.] >>>>>=20 >>>>> [tp]I do have quite a number of detailed comments but do not think = them worth making until the I-D seems to me more stable. >>>>>=20 >>>>> [if - It=E2=80=99d be great if you could supply them as well so I = can start going though them and fixing what=E2=80=99s currently fixable = in parallel to the discussion above.] >>>>>=20 >>>>> Tom Petch >>>>>=20 >>>>> On 07/01/2021 16:10, = ianfarrer@gmx.com> wrote: >>>>> Hi Tom, >>>>>=20 >>=20 >> -- >> Ladislav Lhotka >> Head, CZ.NIC Labs >> PGP Key ID: 0xB8F92B08A9F76C67 From nobody Fri Jan 22 02:06:48 2021 Return-Path: X-Original-To: netmod@ietfa.amsl.com Delivered-To: netmod@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id A3E8E3A11FE for ; 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Fri, 22 Jan 2021 10:06:40 +0000 From: tom petch To: "ianfarrer@gmx.com" CC: =?Windows-1252?Q?Martin_Bj=F6rklund?= , "ladislav.lhotka@nic.cz" , "andy@yumaworks.com" , "netmod@ietf.org" , "j.schoenwaelder@jacobs-university.de" Thread-Topic: Structuring a DHCP module Thread-Index: AQHW70sVzeGJg/CSikuUFwnormzctaow1pyAgAEdNOWAABNGgIAABKIAgAA9LPKAAAhzgIAACCuZgADpuYCAACNFOQ== Date: Fri, 22 Jan 2021 10:06:40 +0000 Message-ID: References: <20210121.134211.1244086498697136841.id@4668.se> <77892263-e7f9-bef3-b9ab-cff36f382891@nic.cz> <20210121.180757.1756334498885863433.id@4668.se> , <22C508AF-39A8-4F14-BB7E-3B47BBA96C64@gmx.com> In-Reply-To: <22C508AF-39A8-4F14-BB7E-3B47BBA96C64@gmx.com> Accept-Language: en-GB, en-US Content-Language: en-GB X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: gmx.com; dkim=none (message not signed) header.d=none;gmx.com; dmarc=none action=none header.from=btconnect.com; x-originating-ip: [86.146.121.140] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 4ce82408-7c13-411f-753b-08d8bebd69c9 x-ms-traffictypediagnostic: AM6PR0702MB3798: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; 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charset="Windows-1252" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: btconnect.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: AM7PR07MB6248.eurprd07.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 4ce82408-7c13-411f-753b-08d8bebd69c9 X-MS-Exchange-CrossTenant-originalarrivaltime: 22 Jan 2021 10:06:40.4806 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: cf8853ed-96e5-465b-9185-806bfe185e30 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 2i106Vm1anWPNKY+DvBejBfThKLshxmSpQPbhSvR1kKxK/NYfZMShdLKGCxBb59uVctIGjf78R73KTPH615gcQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM6PR0702MB3798 Archived-At: Subject: Re: [netmod] Structuring a DHCP module X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 22 Jan 2021 10:06:47 -0000 From: ianfarrer@gmx.com =0A= Sent: 22 January 2021 07:33=0A= =0A= I=92m planning to restructure so that the common module is imported by clie= nt, server and relay, which means that the identity/role is no longer neede= d for this. (I need to look at whether the identities are needed for other = reasons, such as how the modules will be extended with additional option de= finitions etc.). This seems simpler to me and avoids the common module need= ing to import all 3 of the other modules with the dependency problems that = introduces.=0A= =0A= =0A= Sounds like a good idea to me.=0A= =0A= Does this address Martin's comment about not understanding the purpose of= =0A= a leaf called "dhcpv6-node-type"?=0A= =0A= For me. if identities are needed, they belong in the common module so all n= ode types have access to them (my instinct would be to specify them even if= they are not needed at present on the grounds that they likely will be). = Likewise, if there is a need to know the node type, I see that also as part= of a common module but then, as I said before, I am more used to, more com= fortable with, a single module. I have great respect for Lada's recommenda= tions so if he sees three modules as best, I will take that on board. (You= will have seen the comments up-thread from others about the support from t= ools offering somewhat more with a single module). =0A= =0A= Another point where different models take different views is whether or not= there should be a leaf to enable the function, be it server, relay, client= or some combination thereof; some do, others just say that if the module i= s implemented on a node then of course it is enabled! =0A= =0A= Another thought, if a node only implements the relay module, say, and there= is no leaf for node type, can you test for that in a module which wants to= augment the common module only if relay is implemented and/or enabled? A= presence container would do it, probably other ways as well, but I cannot = recall seeing that done.=0A= =0A= Tom Petch =0A= >=0A= =0A= =0A= Ian=0A= =0A= > On 21. Jan 2021, at 18:48, tom petch wrote:=0A= >=0A= > From: Martin Bj=F6rklund =0A= > Sent: 21 January 2021 17:07=0A= >=0A= > tom petch wrote:=0A= >> From: Ladislav Lhotka =0A= >> Sent: 21 January 2021 12:58=0A= >>=0A= >> Hi,=0A= >>=0A= >> in my YD review 4.5 years ago I actually recommended to use separate=0A= >> modules:=0A= >>=0A= >> https://mailarchive.ietf.org/arch/msg/yang-doctors/GXHkGqZeIidMzpziZmK_I= CrKPs4/=0A= >>=0A= >> I think it is a matter of how much the different part overlap. For an=0A= >> implementer, it seems to be easier to pick just the relevant parts,=0A= >> provided they are easy to locate and identify.=0A= >>=0A= >> =0A= >> Thank you for all the responses; I did look at the data tracker to see = if there had been any reviews, thinking that a previous review would be th= e right place to start, and it said 'No reviews'! Perhaps these time out.= =0A= >>=0A= >> I am not comfortable with the seven modules seeing four as better, a com= mon which is then augmented with server, relay, client, with the common con= taining the role(s), whereas at present it is the three role modules that c= ontain the role which then drives having the three option modules so each o= ption module only imports one role module, and that is the bit I find most = awkward.=0A= >>=0A= >> How best to select the three roles? As I said upthread, I have seen the= role specified with features, with augment/when based on identityref (alth= ough not with the three identity defined in the three role modules), presen= ce containers and so on (I have probably seen that and more in the history = of this I-D:-).=0A= >=0A= > Is "role" the same as "node-type"? Each of these module define their=0A= > own copy of a leaf called "dhcpv6-node-type". I am not sure I=0A= > understand what purpose this leaf serves. It seems to me that it can=0A= > be removed, but perhaps I am missing something.=0A= >=0A= > =0A= >=0A= > Me too. I am assuming that it is intended to define the role but I could= be quite wrong. Need input from Ian on this.=0A= >=0A= >> My instinct would be to put the three identity definitions into common w= ith a dhcpv6 container, which is then augmented by the three role modules, = the YANG 'when' referring to role leaf in the common. Any better ways?=0A= >=0A= > Why do augment at all? Why not just have a top-level container in=0A= > each module; 'dhcpv6-client', 'dhcpv6-server' etc?=0A= >=0A= > =0A= > Yes, I am just lifting the structure of another I-D probably for no good = engineering reason:-(.=0A= >=0A= > Tom Petch=0A= >=0A= > /martin=0A= >=0A= >=0A= >=0A= >>=0A= >> Tom Petch=0A= >>=0A= >> Lada=0A= >>=0A= >> On 21. 01. 21 13:42, Martin Bj=F6rklund wrote:=0A= >>> Hi,=0A= >>>=0A= >>> I think it is a matter of taste and perhaps future extensibility if=0A= >>> this model is done as one or more YANG modules. It can certainly be=0A= >>> done in one module, with features for client, server and relay, but it= =0A= >>> is also ok to have 3 modules for the different functions. And once=0A= >>> you have these 3 modules, it is natural to have a "common" module,=0A= >>> leading to 4 modules. In order to keep the number of modules down,=0A= >>> perhaps the various -options modules could be merged into the other=0A= >>> 3, probably with a feature each.=0A= >>>=0A= >>> One comment is that it might be wise to avoid having a rfc number in=0A= >>> the identifier. What happens if/when that RFC is revised for any=0A= >>> reason?=0A= >>>=0A= >>>=0A= >>> /martin=0A= >>>=0A= >>>=0A= >>> tom petch wrote:=0A= >>>>=0A= >>>> Inline =0A= >>>>=0A= >>>> From: Andy Bierman =0A= >>>> Sent: 20 January 2021 18:32=0A= >>>>=0A= >>>> On Wed, Jan 20, 2021 at 8:41 AM tom petch > wrote:=0A= >>>> Juergen, Lada, Martin, Andy=0A= >>>>=0A= >>>> I wonder if one of you, or perhaps another on this list, would be will= ing to give advice on the=0A= >>>> structuring of the YANG module for DHCP. It has been revised and res= tructured several times and, to me, is not progressing.=0A= >>>>=0A= >>>> It models three roles - client, server, relay - and a dozen optional f= unction which can appear in one or more roles. A node will likely have onl= y one role but may have many options.=0A= >>>>=0A= >>>> There are, at present, seven modules=0A= >>>> server which defines a server identity based on common identity inter= alia=0A= >>>> relay which defines relay identity ditto=0A= >>>> client which defines client identity ditto=0A= >>>> server options which has groupings for each option for a server=0A= >>>> client options which has groupings for each option for a relay=0A= >>>> relay options which has groupings for each option for a client=0A= >>>> common which defines the common identity inter alia=0A= >>>> Since options are common across roles, some groupings are replicated i= n the three options modules. Three separate option modules were created to= avoid problems with imports as Ian explains below. The I-D is draft-ietf-= dhc-dhcpv6-yang=0A= >>>>=0A= >>>> My take is that one module is best, using 'when' or if-feature to sele= ct, which is what I see with OSPF, PCE, TCP, IGMP and almost everything els= e but am struggling to convince others, especially the author Ian. [IF] i= n the e-mail extract below=0A= >>>>=0A= >>>> I suggested asking a YANG Doctor, NOT to look at the module but rather= to advise on a structure given the requirements to which Ian said that he = had not had much joy with YANG Doctors. I append our most recent exchange = in which he responds to my query as to why there are seven modules; formatt= ing is a bit of a mess I am afraid. The posts are to the DHCWG mail list.= =0A= >>>>=0A= >>>> Any advice appreciated even if it is that Ian is on just the right tra= ck!=0A= >>>>=0A= >>>>=0A= >>>> Either approach is valid so multi-module vs. single module w/ features= is more=0A= >>>> of an overall system maintenance issue. 7 modules seems like a lot fo= r DHCP but=0A= >>>> I have no objective criteria to back that up.=0A= >>>>=0A= >>>> There is some confusion about the import-stmt, which leads to many YAN= G modules.=0A= >>>> In compiler terms, importing a module merely makes the symbols availab= le for parsing in the current module.=0A= >>>> The import-stmt implies no conformance requirements whatsoever.=0A= >>>> Only statements that use the imported module can do that.=0A= >>>> (So a server module importing a module that has client groupings is no= t actually a problem.)=0A= >>>>=0A= >>>> =0A= >>>>=0A= >>>> Andy, Juergen,=0A= >>>>=0A= >>>> Thank you for the replies. What Ian said about the import is=0A= >>>>=0A= >>>>> [IF] The separation of the option modules came at a later stage based= on import dependencies of a single options module. When the options module= imports the client/server/relay modules so it can augment the relevant mod= ule based on identity, an implementation also needs to import these modules= and will declare them in it=92s capabilities as available even though it d= oesn=92t implement them. Dividing the options modules avoids the need for d= eviations.=0A= >>>>=0A= >>>> that is, the prefix for dhcpv6-server is defined in the server mo= dule,=0A= >>>> module ietf-dhcpv6-server {=0A= >>>> ...=0A= >>>> prefix "dhcpv6-server";=0A= >>>> ...=0A= >>>> identity server {=0A= >>>> base "dhcpv6-common:dhcpv6-node";=0A= >>>> description "DHCPv6 server identity."; }=0A= >>>> leaf dhcpv6-node-type {=0A= >>>> type identityref {=0A= >>>> base "dhcpv6-common:dhcpv6-node"; }=0A= >>>> description "Type for a DHCPv6 server."; }=0A= >>>>=0A= >>>> and the prefix for dhcpv6-relay in the relay module etc so having a si= ngle module for options which needs to augment options to the server module= needs to import the server module so that the dhcpv6-server prefix is defi= ned, ditto relay and client so the single module for options then imports s= erver and relay and client modules.=0A= >>>>=0A= >>>> With three options modules, each only imports one of server, relay, cl= ient but the groupings are then replicated across the three options modules= .=0A= >>>>=0A= >>>> Logical if you agree with the initial premise (which I do not!).=0A= >>>>=0A= >>>> The seven YANG modules are all in the one I-D of 56pp with the tree di= agrams 12pp.=0A= >>>>=0A= >>>> Tom Petch=0A= >>>> (on European time:-(=0A= >>>>=0A= >>>> YANG Conformance for a single module is better defined than for multip= le related modules.=0A= >>>> The YANG Packages work could fix that someday.=0A= >>>>=0A= >>>> Tom Petch=0A= >>>>=0A= >>>>=0A= >>>> Andy=0A= >>>>=0A= >>>>=0A= >>>> On 19/01/2021 11:25, tom petch wrote:=0A= >>>>> ________________________________________=0A= >>>>> From: dhcwg > o= n behalf of ianfarrer@gmx.com >=0A= >>>>> Sent: 19 January 2021 07:37=0A= >>>>>=0A= >>>>> Thanks for your comments. Please see inline below.=0A= >>>>>=0A= >>>>> Ian=0A= >>>>>=0A= >>>>> On 14. Jan 2021, at 13:40, t petch >> wro= te:=0A= >>>>>=0A= >>>>> Ian=0A= >>>>>=0A= >>>>> I do not understand this I-D; I have tracked it for a number of years= and my understanding of it is diminishing.=0A= >>>>>=0A= >>>>> Currently, it is seven YANG modules: why?=0A= >>>>>=0A= >>>>> [if - The separation into client/server/relay, and DHCP options has b= een in the draft since -05 and the changes were presented and discussed at = IETF101 - I=92ve described the reasoning for this split in the next answer.= Beyond that, the common module was added to avoid (well reduce as you poin= t out below) duplication.=0A= >>>>>=0A= >>>>> The separation of the option modules came at a later stage based on i= mport dependencies of a single options module. When the options module impo= rts the client/server/relay modules so it can augment the relevant module b= ased on identity, an implementation also needs to import these modules and = will declare them in it=92s capabilities as available even though it doesn= =92t implement them. Dividing the options modules avoids the need for devia= tions.=0A= >>>>>=0A= >>>>> Even though there are 7 modules defined here, the likely hood is that= an element implementation would require 3 modules to be implemented (e.g. = client, common and client options).]=0A= >>>>>=0A= >>>>> [tp] Other WG have models with multiple roles and many options and ha= ve a single YANG module, using the features of YANG to tailor the module to= different configurations.=0A= >>>>>=0A= >>>>> [if - It=92s not really tailoring the module to different configurati= ons, they are for the most part separate functional elements in the network= with any device only implementing one of the client, relay or server funct= ions.=0A= >>>>>=0A= >>>>> However, even in the case that a device is both a server and a client= (e.g. a home gateway with a client on the WAN and a server on the LAN), th= e likelihood is that these will be done using different software implementa= tions, so having separate modules for server and client offers implementati= on flexibility.=0A= >>>>>=0A= >>>>> In the case of a monolithic module with the relevant client/relay/ser= ver functionality enabled by features, the module would do nothing unless o= ne or more of the features was enabled, and Is unlikely that you=92d ever e= nable more than one. Is this approach used by other WGs? Could you point me= to some some examples as I've only seen features been used as relatively s= mall optional extensions used when the bulk of the nodes are common?]=0A= >>>>=0A= >>>> [tp]=0A= >>>> Ian=0A= >>>>=0A= >>>> Almost all the YANG models I know of are single module. For example,= =0A= >>>> draft-ietf-ospf-yang supports two versions modelled as identity and 28= =0A= >>>> options modelled as features.=0A= >>>>=0A= >>>> draft-ietf-tcpm-yang supports client and server as containers with=0A= >>>> if-feature and has other features as well=0A= >>>>=0A= >>>> draft-ietf-pim-igmp-mld-yang supports five versions of two protocol=0A= >>>> using identity=0A= >>>>=0A= >>>> draft-pce-pcep-yang offers the roles of pcc or pce or both using typed= ef.=0A= >>>>=0A= >>>> And so on and so on. if-feature, when and suchlike provide the=0A= >>>> necessary customisation.=0A= >>>>=0A= >>>> I think that your problems with options are because the identity are= =0A= >>>> defined in the wrong place. The base, the common module (or part of t= he=0A= >>>> one and only module) should define what is common, what everyone needs= ;=0A= >>>> if there are three roles and a dozen options, than that is where they= =0A= >>>> need to be defined.=0A= >>>>=0A= >>>> Then there can be an object which is configured with the roles of a=0A= >>>> particular box, client or server or relay, or if required, a combinati= on=0A= >>>> of the there - simpler if that is out of scope as you suggest.=0A= >>>>=0A= >>>> My starting point would be a dhc container with a leaf for a role and = then=0A= >>>> containers for client, relay, server, added by augment and controlled = by=0A= >>>> when pointing at the role.=0A= >>>>=0A= >>>> I will post something to the netmod WG list - there are lots of people= =0A= >>>> there with greater exposure than mine who can give better guidance tha= n I.=0A= >>>>=0A= >>>> Tom Petch=0A= >>>>=0A= >>>>> Here you have modelled the options as YANG grouping. The intent of a = grouping is to provide a block of statements that can be reused so avoiding= duplication with the attendant problems. Here you have the same grouping = in triplicate in three different YANG modules which seems to me to be the a= ntithesis of a grouping.=0A= >>>>>=0A= >>>>> [If - We could move the option definitions for "status-code-option-gr= oup=94 (client, server, relay) and =93rapid-commit-option-group, vendor-spe= cific-information-option-group; reconfigure-accept-option-group=94 (client,= server) into the common module to resolve the duplication. I didn=92t do t= his previously as the intention was to keep options definitions in the opti= ons modules for consistency, but it would be simple to change. ]=0A= >>>>>=0A= >>>>> [tp] Likewise I find the specification of server v client v relay unu= sual.=0A= >>>>>=0A= >>>>> [If - A similar approach for separated client/server modules is also = used in RFC8676, where the client and server have discrete function, as wit= h DHCP.]=0A= >>>>>=0A= >>>>> [tp]I wonder if it is worth consulting a YANG doctor, NOT to show the= m the YANG and invite comments, rather outline in an abstract way what it i= s you want to model and see what they suggest; that might well be a single = YANG module.=0A= >>>>>=0A= >>>>> [if - Yes, I=92d be happy to. Is there someone that you have in mind = (I=92ve not had much luck with getting YANG doctor input outside of the for= mal review process in the past)?. I=92m not opposed to changing the way tha= t the modules are structured on principal, I do however, think that the sep= aration by functional element is logical and simpler for implementers, and = I would like to know what the benefits of a single module (or other structu= re) might be.]=0A= >>>>>=0A= >>>>> [tp]I do have quite a number of detailed comments but do not think th= em worth making until the I-D seems to me more stable.=0A= >>>>>=0A= >>>>> [if - It=92d be great if you could supply them as well so I can start= going though them and fixing what=92s currently fixable in parallel to the= discussion above.]=0A= >>>>>=0A= >>>>> Tom Petch=0A= >>>>>=0A= >>>>> On 07/01/2021 16:10, ianfarrer@gmx.com> wrote:=0A= >>>>> Hi Tom,=0A= >>>>>=0A= >>=0A= >> --=0A= >> Ladislav Lhotka=0A= >> Head, CZ.NIC Labs=0A= >> PGP Key ID: 0xB8F92B08A9F76C67=0A= =0A= From nobody Mon Jan 25 07:04:55 2021 Return-Path: X-Original-To: netmod@ietfa.amsl.com Delivered-To: netmod@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id CC2193A1402 for ; Mon, 25 Jan 2021 07:04:53 -0800 (PST) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -0.017 X-Spam-Level: X-Spam-Status: No, score=-0.017 tagged_above=-999 required=5 tests=[DKIM_SIGNED=0.1, DKIM_VALID=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_BLOCKED=0.001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=gmx.net Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id zxy-UTv14BVt for ; Mon, 25 Jan 2021 07:04:51 -0800 (PST) Received: from mout.gmx.net (mout.gmx.net [212.227.15.15]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id EBE3D3A13FA for ; Mon, 25 Jan 2021 07:04:50 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1611587067; bh=9v16ir4dGJbHVwTZlF3AOpqmM8C9ennVdiuTSF870y0=; h=X-UI-Sender-Class:Subject:From:In-Reply-To:Date:Cc:References:To; b=R62OuykecJZutkFGuWLui6gR515NStLTF49nlnRXky8+6O6vkN2rOCC4i0sT1oDi+ mbWBCAvv/hRTfeQ3ahcjiDeQVKy1WRlEi02B9NnW+pSl+JF9D/+M4zUIRnJ7oxpn0V S2lWakE4a45kk8cxz1MmplIoKR/l76tGb8T2c2t4= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from mbp-big-sur.fritz.box ([78.35.205.160]) by mail.gmx.net (mrgmx004 [212.227.17.184]) with ESMTPSA (Nemesis) id 1MrQIv-1lox4e32BT-00oaAT; Mon, 25 Jan 2021 16:04:27 +0100 Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 14.0 \(3654.40.0.2.32\)) From: ianfarrer@gmx.com In-Reply-To: Date: Mon, 25 Jan 2021 16:04:23 +0100 Cc: =?utf-8?Q?Martin_Bj=C3=B6rklund?= , "ladislav.lhotka@nic.cz" , "andy@yumaworks.com" , "netmod@ietf.org" , "j.schoenwaelder@jacobs-university.de" Content-Transfer-Encoding: quoted-printable Message-Id: <285B074F-66EF-4A47-8C56-D9982529B09F@gmx.com> References: <20210121.134211.1244086498697136841.id@4668.se> <77892263-e7f9-bef3-b9ab-cff36f382891@nic.cz> <20210121.180757.1756334498885863433.id@4668.se> <22C508AF-39A8-4F14-BB7E-3B47BBA96C64@gmx.com> To: tom petch X-Mailer: Apple Mail (2.3654.40.0.2.32) X-Provags-ID: V03:K1:UvJ7rJQwZST5HgjYIcS1mx3ZA3FsteHLXDIMbIGgGNNcr8NtqcE TGMj4g1wilMJ2mNEb36emx9BCKAhATELRdMnKfvRkq295q6IeF9BJacViAk2AeD4M7Kxntd pOwtM9JK7rv1XyUSVw11sapV5fkKvGIFvmy+n1K5WBJR1QzG4AxGVyvyMdHbCI2TlQLgtU4 SDwY2p0OBTavRF2lDKdzg== X-UI-Out-Filterresults: notjunk:1;V03:K0:HmWWpI8LGr8=:p07HMeZk+hA64nFMzsJnUX FW+D4ZDvxGEgOYoIz9+55//TMJNM572K3Q0dXum1rAERoIKPD2tQ9hSHKbHU1C98VQyeB068V KgVntyM0xI0WwHAfWOWAbdUYx07NfTVXAJHDDEHuCosy863aNJ/MgYRbshpg7BlWlZpIDwxCD zc27MpwFT1FB2WYAHGiXvcRKvlLM3fuCNVm5ED7A40h/Gt3uLJ6Cg8n29ihzj1IpmIDGd+F3u m1CUdJm2MY2wmYIMAKxJT4zCzLOSgoRHImyozSWQyu1fHEYmb9uqBxukpiiXnZ9wqsPXrXJC3 GnrY+WZ2fXxKsUiNUjU4NgPXrlgf12zl1hdIKcUynulw2u8MWVAKORNWf80zuUCiEr/RJrn6n 5hu1n4mZhibUd5Xo/FEN6vgmM0tkwYbjnnE1iG9fO3js9lUgBAyNJz4a4PyvfwXtiryEi3CEu MMiBBy9kDcQJh2e0Xp/gIjpbETuRtAuRWhGIYX6j0yIN4g1B+DZn63SVCh+nxaBvODBxemQ0x G3CPbQQRvUfn2TXKUAe5b432BHPa4uHd/cwjljZ/ebM2Wp69nx7HS/6ezq3Ppq5M5sFDUgUu0 Kak/PKpIVSvtdA0EyzS+zIe/3639iejoZ/vkyA7UPLx/VZAtsMkNEJux/pdm9/0KgtN4Q1OLt ia2Pb9hVoVmBqelb/Pen2bUZgh0WJpjwQo2ZRhjGT3O0iLAr+1BHRSs5hyckCs1EfIVUdliTp 6nDhmH9GwyRzKhJ4PlokFq/eHtcMZP9aAG6FgDu8EnLoKcA7tmts1B64quNerpeM9OeUx9vDh sSZu8lOh4CH7MLW9IZlpDZxEbBiVfo2fUaxbbiGInB0/tLUJdWuXlrytjVOogF/pnekEfIkGQ dgKBv+mPzrxNLVPa8R9w== Archived-At: Subject: Re: [netmod] Structuring a DHCP module X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 25 Jan 2021 15:04:54 -0000 Hi Tom, Please see inline. Ian > On 22. Jan 2021, at 11:06, tom petch wrote: >=20 > From: ianfarrer@gmx.com > Sent: 22 January 2021 07:33 >=20 > I=E2=80=99m planning to restructure so that the common module is = imported by client, server and relay, which means that the identity/role = is no longer needed for this. (I need to look at whether the identities = are needed for other reasons, such as how the modules will be extended = with additional option definitions etc.). This seems simpler to me and = avoids the common module needing to import all 3 of the other modules = with the dependency problems that introduces. >=20 > > Sounds like a good idea to me. >=20 > Does this address Martin's comment about not understanding the purpose = of > a leaf called "dhcpv6-node-type"? >=20 > For me. if identities are needed, they belong in the common module so = all node types have access to them (my instinct would be to specify them = even if they are not needed at present on the grounds that they likely = will be). Likewise, if there is a need to know the node type, I see = that also as part of a common module but then, as I said before, I am = more used to, more comfortable with, a single module. I have great = respect for Lada's recommendations so if he sees three modules as best, = I will take that on board. (You will have seen the comments up-thread = from others about the support from tools offering somewhat more with a = single module). =20 [if - I=E2=80=99ve spent some time with the restructure that=E2=80=99s = being discussed, and the identities will no longer be needed.] >=20 > Another point where different models take different views is whether = or not there should be a leaf to enable the function, be it server, = relay, client or some combination thereof; some do, others just say that = if the module is implemented on a node then of course it is enabled! =20 [If - I think in this case is it would be useful. I=E2=80=99ll add in = the next update. For the client and relay modules, it would also make = sense to have an enable node for each relay/client interface.] >=20 > Another thought, if a node only implements the relay module, say, and = there is no leaf for node type, can you test for that in a module which = wants to augment the common module only if relay is implemented and/or = enabled? A presence container would do it, probably other ways as = well, but I cannot recall seeing that done. [if - Wouldn=E2=80=99t you just augment the relay module directly in = this case?] >=20 > Tom Petch=20 >>=20 >=20 >=20 > Ian >=20 >> On 21. Jan 2021, at 18:48, tom petch wrote: >>=20 >> From: Martin Bj=C3=B6rklund >> Sent: 21 January 2021 17:07 >>=20 >> tom petch wrote: >>> From: Ladislav Lhotka >>> Sent: 21 January 2021 12:58 >>>=20 >>> Hi, >>>=20 >>> in my YD review 4.5 years ago I actually recommended to use separate >>> modules: >>>=20 >>> = https://mailarchive.ietf.org/arch/msg/yang-doctors/GXHkGqZeIidMzpziZmK_ICr= KPs4/ >>>=20 >>> I think it is a matter of how much the different part overlap. For = an >>> implementer, it seems to be easier to pick just the relevant parts, >>> provided they are easy to locate and identify. >>>=20 >>> >>> Thank you for all the responses; I did look at the data tracker to = see if there had been any reviews, thinking that a previous review would = be the right place to start, and it said 'No reviews'! Perhaps these = time out. >>>=20 >>> I am not comfortable with the seven modules seeing four as better, a = common which is then augmented with server, relay, client, with the = common containing the role(s), whereas at present it is the three role = modules that contain the role which then drives having the three option = modules so each option module only imports one role module, and that is = the bit I find most awkward. >>>=20 >>> How best to select the three roles? As I said upthread, I have seen = the role specified with features, with augment/when based on identityref = (although not with the three identity defined in the three role = modules), presence containers and so on (I have probably seen that and = more in the history of this I-D:-). >>=20 >> Is "role" the same as "node-type"? Each of these module define their >> own copy of a leaf called "dhcpv6-node-type". I am not sure I >> understand what purpose this leaf serves. It seems to me that it can >> be removed, but perhaps I am missing something. >>=20 >> >>=20 >> Me too. I am assuming that it is intended to define the role but I = could be quite wrong. Need input from Ian on this. >>=20 >>> My instinct would be to put the three identity definitions into = common with a dhcpv6 container, which is then augmented by the three = role modules, the YANG 'when' referring to role leaf in the common. Any = better ways? >>=20 >> Why do augment at all? Why not just have a top-level container in >> each module; 'dhcpv6-client', 'dhcpv6-server' etc? >>=20 >> >> Yes, I am just lifting the structure of another I-D probably for no = good engineering reason:-(. >>=20 >> Tom Petch >>=20 >> /martin >>=20 >>=20 >>=20 >>>=20 >>> Tom Petch >>>=20 >>> Lada >>>=20 >>> On 21. 01. 21 13:42, Martin Bj=C3=B6rklund wrote: >>>> Hi, >>>>=20 >>>> I think it is a matter of taste and perhaps future extensibility if >>>> this model is done as one or more YANG modules. It can certainly = be >>>> done in one module, with features for client, server and relay, but = it >>>> is also ok to have 3 modules for the different functions. And once >>>> you have these 3 modules, it is natural to have a "common" module, >>>> leading to 4 modules. In order to keep the number of modules down, >>>> perhaps the various -options modules could be merged into the other >>>> 3, probably with a feature each. >>>>=20 >>>> One comment is that it might be wise to avoid having a rfc number = in >>>> the identifier. What happens if/when that RFC is revised for any >>>> reason? >>>>=20 >>>>=20 >>>> /martin >>>>=20 >>>>=20 >>>> tom petch wrote: >>>>>=20 >>>>> Inline >>>>>=20 >>>>> From: Andy Bierman >>>>> Sent: 20 January 2021 18:32 >>>>>=20 >>>>> On Wed, Jan 20, 2021 at 8:41 AM tom petch = > wrote: >>>>> Juergen, Lada, Martin, Andy >>>>>=20 >>>>> I wonder if one of you, or perhaps another on this list, would be = willing to give advice on the >>>>> structuring of the YANG module for DHCP. It has been revised and = restructured several times and, to me, is not progressing. >>>>>=20 >>>>> It models three roles - client, server, relay - and a dozen = optional function which can appear in one or more roles. A node will = likely have only one role but may have many options. >>>>>=20 >>>>> There are, at present, seven modules >>>>> server which defines a server identity based on common identity = inter alia >>>>> relay which defines relay identity ditto >>>>> client which defines client identity ditto >>>>> server options which has groupings for each option for a server >>>>> client options which has groupings for each option for a relay >>>>> relay options which has groupings for each option for a client >>>>> common which defines the common identity inter alia >>>>> Since options are common across roles, some groupings are = replicated in the three options modules. Three separate option modules = were created to avoid problems with imports as Ian explains below. The = I-D is draft-ietf-dhc-dhcpv6-yang >>>>>=20 >>>>> My take is that one module is best, using 'when' or if-feature to = select, which is what I see with OSPF, PCE, TCP, IGMP and almost = everything else but am struggling to convince others, especially the = author Ian. [IF] in the e-mail extract below >>>>>=20 >>>>> I suggested asking a YANG Doctor, NOT to look at the module but = rather to advise on a structure given the requirements to which Ian said = that he had not had much joy with YANG Doctors. I append our most = recent exchange in which he responds to my query as to why there are = seven modules; formatting is a bit of a mess I am afraid. The posts are = to the DHCWG mail list. >>>>>=20 >>>>> Any advice appreciated even if it is that Ian is on just the right = track! >>>>>=20 >>>>>=20 >>>>> Either approach is valid so multi-module vs. single module w/ = features is more >>>>> of an overall system maintenance issue. 7 modules seems like a = lot for DHCP but >>>>> I have no objective criteria to back that up. >>>>>=20 >>>>> There is some confusion about the import-stmt, which leads to many = YANG modules. >>>>> In compiler terms, importing a module merely makes the symbols = available for parsing in the current module. >>>>> The import-stmt implies no conformance requirements whatsoever. >>>>> Only statements that use the imported module can do that. >>>>> (So a server module importing a module that has client groupings = is not actually a problem.) >>>>>=20 >>>>> >>>>>=20 >>>>> Andy, Juergen, >>>>>=20 >>>>> Thank you for the replies. What Ian said about the import is >>>>>=20 >>>>>> [IF] The separation of the option modules came at a later stage = based on import dependencies of a single options module. When the = options module imports the client/server/relay modules so it can augment = the relevant module based on identity, an implementation also needs to = import these modules and will declare them in it=E2=80=99s capabilities = as available even though it doesn=E2=80=99t implement them. Dividing the = options modules avoids the need for deviations. >>>>>=20 >>>>> that is, the prefix for dhcpv6-server is defined in the = server module, >>>>> module ietf-dhcpv6-server { >>>>> ... >>>>> prefix "dhcpv6-server"; >>>>> ... >>>>> identity server { >>>>> base "dhcpv6-common:dhcpv6-node"; >>>>> description "DHCPv6 server identity."; } >>>>> leaf dhcpv6-node-type { >>>>> type identityref { >>>>> base "dhcpv6-common:dhcpv6-node"; } >>>>> description "Type for a DHCPv6 server."; } >>>>>=20 >>>>> and the prefix for dhcpv6-relay in the relay module etc so having = a single module for options which needs to augment options to the server = module needs to import the server module so that the dhcpv6-server = prefix is defined, ditto relay and client so the single module for = options then imports server and relay and client modules. >>>>>=20 >>>>> With three options modules, each only imports one of server, = relay, client but the groupings are then replicated across the three = options modules. >>>>>=20 >>>>> Logical if you agree with the initial premise (which I do not!). >>>>>=20 >>>>> The seven YANG modules are all in the one I-D of 56pp with the = tree diagrams 12pp. >>>>>=20 >>>>> Tom Petch >>>>> (on European time:-( >>>>>=20 >>>>> YANG Conformance for a single module is better defined than for = multiple related modules. >>>>> The YANG Packages work could fix that someday. >>>>>=20 >>>>> Tom Petch >>>>>=20 >>>>>=20 >>>>> Andy >>>>>=20 >>>>>=20 >>>>> On 19/01/2021 11:25, tom petch wrote: >>>>>> ________________________________________ >>>>>> From: dhcwg = > on behalf of = ianfarrer@gmx.com = > >>>>>> Sent: 19 January 2021 07:37 >>>>>>=20 >>>>>> Thanks for your comments. Please see inline below. >>>>>>=20 >>>>>> Ian >>>>>>=20 >>>>>> On 14. Jan 2021, at 13:40, t petch = >> wrote: >>>>>>=20 >>>>>> Ian >>>>>>=20 >>>>>> I do not understand this I-D; I have tracked it for a number of = years and my understanding of it is diminishing. >>>>>>=20 >>>>>> Currently, it is seven YANG modules: why? >>>>>>=20 >>>>>> [if - The separation into client/server/relay, and DHCP options = has been in the draft since -05 and the changes were presented and = discussed at IETF101 - I=E2=80=99ve described the reasoning for this = split in the next answer. Beyond that, the common module was added to = avoid (well reduce as you point out below) duplication. >>>>>>=20 >>>>>> The separation of the option modules came at a later stage based = on import dependencies of a single options module. When the options = module imports the client/server/relay modules so it can augment the = relevant module based on identity, an implementation also needs to = import these modules and will declare them in it=E2=80=99s capabilities = as available even though it doesn=E2=80=99t implement them. Dividing the = options modules avoids the need for deviations. >>>>>>=20 >>>>>> Even though there are 7 modules defined here, the likely hood is = that an element implementation would require 3 modules to be implemented = (e.g. client, common and client options).] >>>>>>=20 >>>>>> [tp] Other WG have models with multiple roles and many options = and have a single YANG module, using the features of YANG to tailor the = module to different configurations. >>>>>>=20 >>>>>> [if - It=E2=80=99s not really tailoring the module to different = configurations, they are for the most part separate functional elements = in the network with any device only implementing one of the client, = relay or server functions. >>>>>>=20 >>>>>> However, even in the case that a device is both a server and a = client (e.g. a home gateway with a client on the WAN and a server on the = LAN), the likelihood is that these will be done using different software = implementations, so having separate modules for server and client offers = implementation flexibility. >>>>>>=20 >>>>>> In the case of a monolithic module with the relevant = client/relay/server functionality enabled by features, the module would = do nothing unless one or more of the features was enabled, and Is = unlikely that you=E2=80=99d ever enable more than one. Is this approach = used by other WGs? Could you point me to some some examples as I've only = seen features been used as relatively small optional extensions used = when the bulk of the nodes are common?] >>>>>=20 >>>>> [tp] >>>>> Ian >>>>>=20 >>>>> Almost all the YANG models I know of are single module. For = example, >>>>> draft-ietf-ospf-yang supports two versions modelled as identity = and 28 >>>>> options modelled as features. >>>>>=20 >>>>> draft-ietf-tcpm-yang supports client and server as containers with >>>>> if-feature and has other features as well >>>>>=20 >>>>> draft-ietf-pim-igmp-mld-yang supports five versions of two = protocol >>>>> using identity >>>>>=20 >>>>> draft-pce-pcep-yang offers the roles of pcc or pce or both using = typedef. >>>>>=20 >>>>> And so on and so on. if-feature, when and suchlike provide the >>>>> necessary customisation. >>>>>=20 >>>>> I think that your problems with options are because the identity = are >>>>> defined in the wrong place. The base, the common module (or part = of the >>>>> one and only module) should define what is common, what everyone = needs; >>>>> if there are three roles and a dozen options, than that is where = they >>>>> need to be defined. >>>>>=20 >>>>> Then there can be an object which is configured with the roles of = a >>>>> particular box, client or server or relay, or if required, a = combination >>>>> of the there - simpler if that is out of scope as you suggest. >>>>>=20 >>>>> My starting point would be a dhc container with a leaf for a role = and then >>>>> containers for client, relay, server, added by augment and = controlled by >>>>> when pointing at the role. >>>>>=20 >>>>> I will post something to the netmod WG list - there are lots of = people >>>>> there with greater exposure than mine who can give better guidance = than I. >>>>>=20 >>>>> Tom Petch >>>>>=20 >>>>>> Here you have modelled the options as YANG grouping. The intent = of a grouping is to provide a block of statements that can be reused so = avoiding duplication with the attendant problems. Here you have the = same grouping in triplicate in three different YANG modules which seems = to me to be the antithesis of a grouping. >>>>>>=20 >>>>>> [If - We could move the option definitions for = "status-code-option-group=E2=80=9D (client, server, relay) and = =E2=80=9Crapid-commit-option-group, = vendor-specific-information-option-group; = reconfigure-accept-option-group=E2=80=9D (client, server) into the = common module to resolve the duplication. I didn=E2=80=99t do this = previously as the intention was to keep options definitions in the = options modules for consistency, but it would be simple to change. ] >>>>>>=20 >>>>>> [tp] Likewise I find the specification of server v client v relay = unusual. >>>>>>=20 >>>>>> [If - A similar approach for separated client/server modules is = also used in RFC8676, where the client and server have discrete = function, as with DHCP.] >>>>>>=20 >>>>>> [tp]I wonder if it is worth consulting a YANG doctor, NOT to show = them the YANG and invite comments, rather outline in an abstract way = what it is you want to model and see what they suggest; that might well = be a single YANG module. >>>>>>=20 >>>>>> [if - Yes, I=E2=80=99d be happy to. Is there someone that you = have in mind (I=E2=80=99ve not had much luck with getting YANG doctor = input outside of the formal review process in the past)?. I=E2=80=99m = not opposed to changing the way that the modules are structured on = principal, I do however, think that the separation by functional element = is logical and simpler for implementers, and I would like to know what = the benefits of a single module (or other structure) might be.] >>>>>>=20 >>>>>> [tp]I do have quite a number of detailed comments but do not = think them worth making until the I-D seems to me more stable. >>>>>>=20 >>>>>> [if - It=E2=80=99d be great if you could supply them as well so I = can start going though them and fixing what=E2=80=99s currently fixable = in parallel to the discussion above.] >>>>>>=20 >>>>>> Tom Petch >>>>>>=20 >>>>>> On 07/01/2021 16:10, = ianfarrer@gmx.com> wrote: >>>>>> Hi Tom, >>>>>>=20 >>>=20 >>> -- >>> Ladislav Lhotka >>> Head, CZ.NIC Labs >>> PGP Key ID: 0xB8F92B08A9F76C67 >=20 From nobody Tue Jan 26 07:13:44 2021 Return-Path: X-Original-To: netmod@ietfa.amsl.com Delivered-To: netmod@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 48BBF3A0B9B for ; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable YANG Versioning Weekly Call Minutes - 2021-01-26 New order of topics for Interim, and rough time allocated: Intros (chair, Jason): 10 minutes T2) IANA considerations: how are final RFC revision labels assigned ? https://github.com/netmod-wg/yang-ver-dt/issues/59 - Rob - 10 minutes T3) YANG file naming when revision labels are being used (symbolic link= s? @) ? - Reshad - 20 minutes T1) Definition/meaning of BC vs NBC for config false nodes https://github.com/netmod-wg/yang-ver-dt/issues/15 - Balazs - 35 minutes T4) SemVer: gaps in history, removing revision statements https://github.com/netmod-wg/yang-ver-dt/issues/61 - Joe - 15 minutes We discussed Github issue #12 about BC vs NBC for changing extension statem= ents https://github.com/netmod-wg/yang-ver-dt/issues/12 - decided to shelve this for now and bring it to the larger WG We discussed topic T3: - what chars should be allowed in filenames? in revision-labels ? - allow unicode? Probably not. - Be restrictive with a small allowed-list ? a-zA-Z0-9_-.,+ - Comma is sometimes used in version strings (precedence), also used someti= mes as a decimal separator. Concern about CSV. e.g. -> 1.6.0,1 (indicates this is greater than 2.0.0) - What about ';' (shell metachar in unix). Probably avoid this one. - Be less restrictive and have a deny-list ? 0x00-0x1F 0x7F " * / : < > ? \= |, #, @ - Use the same rules as YANG module name? We discussed topic T4: - only match on labels in the history contained in the 1 file? vs parsing = multiple files to build the complete lineage ? - warning about removing history (especially if the entry had an NBC tag) Rgds, Jason --_000_DM6PR08MB50840367B68716DE71FCB3E09BBC9DM6PR08MB5084namp_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

YANG Versioning Weekly Call Minutes - 2021-01-26

 

New order of topics for Interim, and rough time allo= cated:

 

    Intros (chair, Jason): 10 minutes=

 

    T2) IANA considerations: how are = final RFC revision labels assigned ?

    https://github.com/netmod-wg/yang= -ver-dt/issues/59

    - Rob

    - 10 minutes

 

    T3) YANG file naming when revisio= n labels are being used (symbolic links? @<revision-label>) ?

    - Reshad

    - 20 minutes

 

    T1) Definition/meaning of BC vs N= BC for config false nodes

    https://github.com/netmod-wg/yang= -ver-dt/issues/15

    - Balazs

    - 35 minutes

 

    T4) SemVer: gaps in history, remo= ving revision statements

    https://github.com/netmod-wg/yang= -ver-dt/issues/61

    - Joe

    - 15 minutes

 

We discussed Github issue #12 about BC vs NBC for ch= anging extension statements

https://github.com/netmod-wg/yang-ver-dt/issues/12

- decided to shelve this for now and bring it to the= larger WG

 

We discussed topic T3:

- what chars should be allowed in filenames?  i= n revision-labels ?

- allow unicode?  Probably not.

- Be restrictive with a small allowed-list ? a-zA-Z0= -9_-.,+

- Comma is sometimes used in version strings (preced= ence), also used sometimes as a decimal separator. Concern about CSV.<= /o:p>

        e.g. &nbs= p;->  1.6.0,1  (indicates this is greater than 2.0.0)

- What about ';'   (shell metachar in unix= ).  Probably avoid this one.

- Be less restrictive and have a deny-list ? 0x00-0x= 1F 0x7F " * / : < > ? \ |, #, @

- Use the same rules as YANG module name?=

 

We discussed topic T4:

- only match on labels in the history contained in t= he 1 file?  vs parsing multiple files to build the complete lineage ?<= o:p>

- warning about removing history (especially if the = entry had an NBC tag)

 

Rgds,

Jason

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Tue, 26 Jan 2021 16:57:02 +0000 From: tom petch To: "ianfarrer@gmx.com" CC: =?Windows-1252?Q?Martin_Bj=F6rklund?= , "ladislav.lhotka@nic.cz" , "andy@yumaworks.com" , "netmod@ietf.org" , "j.schoenwaelder@jacobs-university.de" Thread-Topic: Structuring a DHCP module Thread-Index: AQHW70sVzeGJg/CSikuUFwnormzctaow1pyAgAEdNOWAABNGgIAABKIAgAA9LPKAAAhzgIAACCuZgADpuYCAACNFOYAFEaSAgAFrL2k= Date: Tue, 26 Jan 2021 16:57:02 +0000 Message-ID: References: <20210121.134211.1244086498697136841.id@4668.se> <77892263-e7f9-bef3-b9ab-cff36f382891@nic.cz> <20210121.180757.1756334498885863433.id@4668.se> <22C508AF-39A8-4F14-BB7E-3B47BBA96C64@gmx.com> , <285B074F-66EF-4A47-8C56-D9982529B09F@gmx.com> In-Reply-To: <285B074F-66EF-4A47-8C56-D9982529B09F@gmx.com> Accept-Language: en-GB, en-US Content-Language: en-GB X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: gmx.com; dkim=none (message not signed) header.d=none;gmx.com; dmarc=none action=none header.from=btconnect.com; x-originating-ip: [86.146.121.140] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: bed035c1-ef63-4986-43a1-08d8c21b675e x-ms-traffictypediagnostic: AM7PR07MB6515: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; 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charset="Windows-1252" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: btconnect.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: AM7PR07MB6248.eurprd07.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: bed035c1-ef63-4986-43a1-08d8c21b675e X-MS-Exchange-CrossTenant-originalarrivaltime: 26 Jan 2021 16:57:02.5996 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: cf8853ed-96e5-465b-9185-806bfe185e30 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: VQBaMuZFhhqEf+ot2NBkic1rHEIgaKGopva5nHT2rz9LRDMW0WcTyOkwwmi85idQxM7+8/s75kcJjX4fzhUR2A== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM7PR07MB6515 Archived-At: Subject: Re: [netmod] Structuring a DHCP module X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 26 Jan 2021 16:57:28 -0000 Ian=0A= =0A= Agree mostly. One follow-up in-line under =0A= =0A= Tom Petch=0A= =0A= From: ianfarrer@gmx.com =0A= Sent: 25 January 2021 15:04=0A= =0A= Hi Tom,=0A= =0A= Please see inline.=0A= =0A= Ian=0A= =0A= > On 22. Jan 2021, at 11:06, tom petch wrote:=0A= >=0A= > From: ianfarrer@gmx.com =0A= > Sent: 22 January 2021 07:33=0A= >=0A= > I=92m planning to restructure so that the common module is imported by cl= ient, server and relay, which means that the identity/role is no longer nee= ded for this. (I need to look at whether the identities are needed for othe= r reasons, such as how the modules will be extended with additional option = definitions etc.). This seems simpler to me and avoids the common module ne= eding to import all 3 of the other modules with the dependency problems tha= t introduces.=0A= >=0A= > =0A= > Sounds like a good idea to me.=0A= >=0A= > Does this address Martin's comment about not understanding the purpose of= =0A= > a leaf called "dhcpv6-node-type"?=0A= >=0A= > For me. if identities are needed, they belong in the common module so all= node types have access to them (my instinct would be to specify them even = if they are not needed at present on the grounds that they likely will be).= Likewise, if there is a need to know the node type, I see that also as pa= rt of a common module but then, as I said before, I am more used to, more c= omfortable with, a single module. I have great respect for Lada's recommen= dations so if he sees three modules as best, I will take that on board. (Y= ou will have seen the comments up-thread from others about the support from= tools offering somewhat more with a single module).=0A= =0A= [if - I=92ve spent some time with the restructure that=92s being discussed,= and the identities will no longer be needed.]=0A= =0A= >=0A= > Another point where different models take different views is whether or n= ot there should be a leaf to enable the function, be it server, relay, clie= nt or some combination thereof; some do, others just say that if the module= is implemented on a node then of course it is enabled!=0A= =0A= [If - I think in this case is it would be useful. I=92ll add in the next up= date. For the client and relay modules, it would also make sense to have an= enable node for each relay/client interface.]=0A= =0A= > Another thought, if a node only implements the relay module, say, and the= re is no leaf for node type, can you test for that in a module which wants = to augment the common module only if relay is implemented and/or enabled? = A presence container would do it, probably other ways as well, but I canno= t recall seeing that done.=0A= =0A= [if - Wouldn=92t you just augment the relay module directly in this case?]= =0A= =0A= =0A= Weelll I was positing that it was something that was a better fit for the c= ommon module because that is where other related definitions are but that a= t the moment it is for relay only. Purely hypothetical so leave it for now= .=0A= =0A= Tom Petch=0A= >=0A= > Tom Petch=0A= >>=0A= >=0A= >=0A= > Ian=0A= >=0A= >> On 21. Jan 2021, at 18:48, tom petch wrote:=0A= >>=0A= >> From: Martin Bj=F6rklund =0A= >> Sent: 21 January 2021 17:07=0A= >>=0A= >> tom petch wrote:=0A= >>> From: Ladislav Lhotka =0A= >>> Sent: 21 January 2021 12:58=0A= >>>=0A= >>> Hi,=0A= >>>=0A= >>> in my YD review 4.5 years ago I actually recommended to use separate=0A= >>> modules:=0A= >>>=0A= >>> https://mailarchive.ietf.org/arch/msg/yang-doctors/GXHkGqZeIidMzpziZmK_= ICrKPs4/=0A= >>>=0A= >>> I think it is a matter of how much the different part overlap. For an= =0A= >>> implementer, it seems to be easier to pick just the relevant parts,=0A= >>> provided they are easy to locate and identify.=0A= >>>=0A= >>> =0A= >>> Thank you for all the responses; I did look at the data tracker to see= if there had been any reviews, thinking that a previous review would be t= he right place to start, and it said 'No reviews'! Perhaps these time out.= =0A= >>>=0A= >>> I am not comfortable with the seven modules seeing four as better, a co= mmon which is then augmented with server, relay, client, with the common co= ntaining the role(s), whereas at present it is the three role modules that = contain the role which then drives having the three option modules so each = option module only imports one role module, and that is the bit I find most= awkward.=0A= >>>=0A= >>> How best to select the three roles? As I said upthread, I have seen th= e role specified with features, with augment/when based on identityref (alt= hough not with the three identity defined in the three role modules), prese= nce containers and so on (I have probably seen that and more in the history= of this I-D:-).=0A= >>=0A= >> Is "role" the same as "node-type"? Each of these module define their=0A= >> own copy of a leaf called "dhcpv6-node-type". I am not sure I=0A= >> understand what purpose this leaf serves. It seems to me that it can=0A= >> be removed, but perhaps I am missing something.=0A= >>=0A= >> =0A= >>=0A= >> Me too. I am assuming that it is intended to define the role but I coul= d be quite wrong. Need input from Ian on this.=0A= >>=0A= >>> My instinct would be to put the three identity definitions into common = with a dhcpv6 container, which is then augmented by the three role modules,= the YANG 'when' referring to role leaf in the common. Any better ways?=0A= >>=0A= >> Why do augment at all? Why not just have a top-level container in=0A= >> each module; 'dhcpv6-client', 'dhcpv6-server' etc?=0A= >>=0A= >> =0A= >> Yes, I am just lifting the structure of another I-D probably for no good= engineering reason:-(.=0A= >>=0A= >> Tom Petch=0A= >>=0A= >> /martin=0A= >>=0A= >>=0A= >>=0A= >>>=0A= >>> Tom Petch=0A= >>>=0A= >>> Lada=0A= >>>=0A= >>> On 21. 01. 21 13:42, Martin Bj=F6rklund wrote:=0A= >>>> Hi,=0A= >>>>=0A= >>>> I think it is a matter of taste and perhaps future extensibility if=0A= >>>> this model is done as one or more YANG modules. It can certainly be= =0A= >>>> done in one module, with features for client, server and relay, but it= =0A= >>>> is also ok to have 3 modules for the different functions. And once=0A= >>>> you have these 3 modules, it is natural to have a "common" module,=0A= >>>> leading to 4 modules. In order to keep the number of modules down,=0A= >>>> perhaps the various -options modules could be merged into the other=0A= >>>> 3, probably with a feature each.=0A= >>>>=0A= >>>> One comment is that it might be wise to avoid having a rfc number in= =0A= >>>> the identifier. What happens if/when that RFC is revised for any=0A= >>>> reason?=0A= >>>>=0A= >>>>=0A= >>>> /martin=0A= >>>>=0A= >>>>=0A= >>>> tom petch wrote:=0A= >>>>>=0A= >>>>> Inline =0A= >>>>>=0A= >>>>> From: Andy Bierman =0A= >>>>> Sent: 20 January 2021 18:32=0A= >>>>>=0A= >>>>> On Wed, Jan 20, 2021 at 8:41 AM tom petch > wrote:=0A= >>>>> Juergen, Lada, Martin, Andy=0A= >>>>>=0A= >>>>> I wonder if one of you, or perhaps another on this list, would be wil= ling to give advice on the=0A= >>>>> structuring of the YANG module for DHCP. It has been revised and re= structured several times and, to me, is not progressing.=0A= >>>>>=0A= >>>>> It models three roles - client, server, relay - and a dozen optional = function which can appear in one or more roles. A node will likely have on= ly one role but may have many options.=0A= >>>>>=0A= >>>>> There are, at present, seven modules=0A= >>>>> server which defines a server identity based on common identity inte= r alia=0A= >>>>> relay which defines relay identity ditto=0A= >>>>> client which defines client identity ditto=0A= >>>>> server options which has groupings for each option for a server=0A= >>>>> client options which has groupings for each option for a relay=0A= >>>>> relay options which has groupings for each option for a client=0A= >>>>> common which defines the common identity inter alia=0A= >>>>> Since options are common across roles, some groupings are replicated = in the three options modules. Three separate option modules were created t= o avoid problems with imports as Ian explains below. The I-D is draft-ietf= -dhc-dhcpv6-yang=0A= >>>>>=0A= >>>>> My take is that one module is best, using 'when' or if-feature to sel= ect, which is what I see with OSPF, PCE, TCP, IGMP and almost everything el= se but am struggling to convince others, especially the author Ian. [IF] = in the e-mail extract below=0A= >>>>>=0A= >>>>> I suggested asking a YANG Doctor, NOT to look at the module but rathe= r to advise on a structure given the requirements to which Ian said that he= had not had much joy with YANG Doctors. I append our most recent exchange= in which he responds to my query as to why there are seven modules; format= ting is a bit of a mess I am afraid. The posts are to the DHCWG mail list.= =0A= >>>>>=0A= >>>>> Any advice appreciated even if it is that Ian is on just the right tr= ack!=0A= >>>>>=0A= >>>>>=0A= >>>>> Either approach is valid so multi-module vs. single module w/ feature= s is more=0A= >>>>> of an overall system maintenance issue. 7 modules seems like a lot f= or DHCP but=0A= >>>>> I have no objective criteria to back that up.=0A= >>>>>=0A= >>>>> There is some confusion about the import-stmt, which leads to many YA= NG modules.=0A= >>>>> In compiler terms, importing a module merely makes the symbols availa= ble for parsing in the current module.=0A= >>>>> The import-stmt implies no conformance requirements whatsoever.=0A= >>>>> Only statements that use the imported module can do that.=0A= >>>>> (So a server module importing a module that has client groupings is n= ot actually a problem.)=0A= >>>>>=0A= >>>>> =0A= >>>>>=0A= >>>>> Andy, Juergen,=0A= >>>>>=0A= >>>>> Thank you for the replies. What Ian said about the import is=0A= >>>>>=0A= >>>>>> [IF] The separation of the option modules came at a later stage base= d on import dependencies of a single options module. When the options modul= e imports the client/server/relay modules so it can augment the relevant mo= dule based on identity, an implementation also needs to import these module= s and will declare them in it=92s capabilities as available even though it = doesn=92t implement them. Dividing the options modules avoids the need for = deviations.=0A= >>>>>=0A= >>>>> that is, the prefix for dhcpv6-server is defined in the server m= odule,=0A= >>>>> module ietf-dhcpv6-server {=0A= >>>>> ...=0A= >>>>> prefix "dhcpv6-server";=0A= >>>>> ...=0A= >>>>> identity server {=0A= >>>>> base "dhcpv6-common:dhcpv6-node";=0A= >>>>> description "DHCPv6 server identity."; }=0A= >>>>> leaf dhcpv6-node-type {=0A= >>>>> type identityref {=0A= >>>>> base "dhcpv6-common:dhcpv6-node"; }=0A= >>>>> description "Type for a DHCPv6 server."; }=0A= >>>>>=0A= >>>>> and the prefix for dhcpv6-relay in the relay module etc so having a s= ingle module for options which needs to augment options to the server modul= e needs to import the server module so that the dhcpv6-server prefix is def= ined, ditto relay and client so the single module for options then imports = server and relay and client modules.=0A= >>>>>=0A= >>>>> With three options modules, each only imports one of server, relay, c= lient but the groupings are then replicated across the three options module= s.=0A= >>>>>=0A= >>>>> Logical if you agree with the initial premise (which I do not!).=0A= >>>>>=0A= >>>>> The seven YANG modules are all in the one I-D of 56pp with the tree d= iagrams 12pp.=0A= >>>>>=0A= >>>>> Tom Petch=0A= >>>>> (on European time:-(=0A= >>>>>=0A= >>>>> YANG Conformance for a single module is better defined than for multi= ple related modules.=0A= >>>>> The YANG Packages work could fix that someday.=0A= >>>>>=0A= >>>>> Tom Petch=0A= >>>>>=0A= >>>>>=0A= >>>>> Andy=0A= >>>>>=0A= >>>>>=0A= >>>>> On 19/01/2021 11:25, tom petch wrote:=0A= >>>>>> ________________________________________=0A= >>>>>> From: dhcwg > = on behalf of ianfarrer@gmx.com >=0A= >>>>>> Sent: 19 January 2021 07:37=0A= >>>>>>=0A= >>>>>> Thanks for your comments. Please see inline below.=0A= >>>>>>=0A= >>>>>> Ian=0A= >>>>>>=0A= >>>>>> On 14. Jan 2021, at 13:40, t petch >> wr= ote:=0A= >>>>>>=0A= >>>>>> Ian=0A= >>>>>>=0A= >>>>>> I do not understand this I-D; I have tracked it for a number of year= s and my understanding of it is diminishing.=0A= >>>>>>=0A= >>>>>> Currently, it is seven YANG modules: why?=0A= >>>>>>=0A= >>>>>> [if - The separation into client/server/relay, and DHCP options has = been in the draft since -05 and the changes were presented and discussed at= IETF101 - I=92ve described the reasoning for this split in the next answer= . Beyond that, the common module was added to avoid (well reduce as you poi= nt out below) duplication.=0A= >>>>>>=0A= >>>>>> The separation of the option modules came at a later stage based on = import dependencies of a single options module. When the options module imp= orts the client/server/relay modules so it can augment the relevant module = based on identity, an implementation also needs to import these modules and= will declare them in it=92s capabilities as available even though it doesn= =92t implement them. Dividing the options modules avoids the need for devia= tions.=0A= >>>>>>=0A= >>>>>> Even though there are 7 modules defined here, the likely hood is tha= t an element implementation would require 3 modules to be implemented (e.g.= client, common and client options).]=0A= >>>>>>=0A= >>>>>> [tp] Other WG have models with multiple roles and many options and h= ave a single YANG module, using the features of YANG to tailor the module t= o different configurations.=0A= >>>>>>=0A= >>>>>> [if - It=92s not really tailoring the module to different configurat= ions, they are for the most part separate functional elements in the networ= k with any device only implementing one of the client, relay or server func= tions.=0A= >>>>>>=0A= >>>>>> However, even in the case that a device is both a server and a clien= t (e.g. a home gateway with a client on the WAN and a server on the LAN), t= he likelihood is that these will be done using different software implement= ations, so having separate modules for server and client offers implementat= ion flexibility.=0A= >>>>>>=0A= >>>>>> In the case of a monolithic module with the relevant client/relay/se= rver functionality enabled by features, the module would do nothing unless = one or more of the features was enabled, and Is unlikely that you=92d ever = enable more than one. Is this approach used by other WGs? Could you point m= e to some some examples as I've only seen features been used as relatively = small optional extensions used when the bulk of the nodes are common?]=0A= >>>>>=0A= >>>>> [tp]=0A= >>>>> Ian=0A= >>>>>=0A= >>>>> Almost all the YANG models I know of are single module. For example,= =0A= >>>>> draft-ietf-ospf-yang supports two versions modelled as identity and 2= 8=0A= >>>>> options modelled as features.=0A= >>>>>=0A= >>>>> draft-ietf-tcpm-yang supports client and server as containers with=0A= >>>>> if-feature and has other features as well=0A= >>>>>=0A= >>>>> draft-ietf-pim-igmp-mld-yang supports five versions of two protocol= =0A= >>>>> using identity=0A= >>>>>=0A= >>>>> draft-pce-pcep-yang offers the roles of pcc or pce or both using type= def.=0A= >>>>>=0A= >>>>> And so on and so on. if-feature, when and suchlike provide the=0A= >>>>> necessary customisation.=0A= >>>>>=0A= >>>>> I think that your problems with options are because the identity are= =0A= >>>>> defined in the wrong place. The base, the common module (or part of = the=0A= >>>>> one and only module) should define what is common, what everyone need= s;=0A= >>>>> if there are three roles and a dozen options, than that is where they= =0A= >>>>> need to be defined.=0A= >>>>>=0A= >>>>> Then there can be an object which is configured with the roles of a= =0A= >>>>> particular box, client or server or relay, or if required, a combinat= ion=0A= >>>>> of the there - simpler if that is out of scope as you suggest.=0A= >>>>>=0A= >>>>> My starting point would be a dhc container with a leaf for a role and= then=0A= >>>>> containers for client, relay, server, added by augment and controlled= by=0A= >>>>> when pointing at the role.=0A= >>>>>=0A= >>>>> I will post something to the netmod WG list - there are lots of peopl= e=0A= >>>>> there with greater exposure than mine who can give better guidance th= an I.=0A= >>>>>=0A= >>>>> Tom Petch=0A= >>>>>=0A= >>>>>> Here you have modelled the options as YANG grouping. The intent of a= grouping is to provide a block of statements that can be reused so avoidin= g duplication with the attendant problems. Here you have the same grouping= in triplicate in three different YANG modules which seems to me to be the = antithesis of a grouping.=0A= >>>>>>=0A= >>>>>> [If - We could move the option definitions for "status-code-option-g= roup=94 (client, server, relay) and =93rapid-commit-option-group, vendor-sp= ecific-information-option-group; reconfigure-accept-option-group=94 (client= , server) into the common module to resolve the duplication. I didn=92t do = this previously as the intention was to keep options definitions in the opt= ions modules for consistency, but it would be simple to change. ]=0A= >>>>>>=0A= >>>>>> [tp] Likewise I find the specification of server v client v relay un= usual.=0A= >>>>>>=0A= >>>>>> [If - A similar approach for separated client/server modules is also= used in RFC8676, where the client and server have discrete function, as wi= th DHCP.]=0A= >>>>>>=0A= >>>>>> [tp]I wonder if it is worth consulting a YANG doctor, NOT to show th= em the YANG and invite comments, rather outline in an abstract way what it = is you want to model and see what they suggest; that might well be a single= YANG module.=0A= >>>>>>=0A= >>>>>> [if - Yes, I=92d be happy to. Is there someone that you have in mind= (I=92ve not had much luck with getting YANG doctor input outside of the fo= rmal review process in the past)?. I=92m not opposed to changing the way th= at the modules are structured on principal, I do however, think that the se= paration by functional element is logical and simpler for implementers, and= I would like to know what the benefits of a single module (or other struct= ure) might be.]=0A= >>>>>>=0A= >>>>>> [tp]I do have quite a number of detailed comments but do not think t= hem worth making until the I-D seems to me more stable.=0A= >>>>>>=0A= >>>>>> [if - It=92d be great if you could supply them as well so I can star= t going though them and fixing what=92s currently fixable in parallel to th= e discussion above.]=0A= >>>>>>=0A= >>>>>> Tom Petch=0A= >>>>>>=0A= >>>>>> On 07/01/2021 16:10, ianfarrer@gmx.com> wrote:=0A= >>>>>> Hi Tom,=0A= >>>>>>=0A= >>>=0A= >>> --=0A= >>> Ladislav Lhotka=0A= >>> Head, CZ.NIC Labs=0A= >>> PGP Key ID: 0xB8F92B08A9F76C67=0A= >=0A= =0A= From nobody Thu Jan 28 13:18:35 2021 Return-Path: X-Original-To: netmod@ietfa.amsl.com Delivered-To: netmod@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4EC0D3A1714 for ; 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Thu, 28 Jan 2021 21:18:27 +0000 From: "Sterne, Jason (Nokia - CA/Ottawa)" To: "netmod@ietf.org" Thread-Topic: [netmod] Network Modeling (netmod) WG Virtual Meeting: 2021-02-01 CHANGED Thread-Index: AQHW61rzxAbwH/yDlkCcBt5oLj1JC6oo4JCggBS+k0A= Date: Thu, 28 Jan 2021 21:18:27 +0000 Message-ID: References: <161072776741.29590.13830234810493226103@ietfa.amsl.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: authentication-results: ietf.org; dkim=none (message not signed) header.d=none;ietf.org; dmarc=none action=none header.from=nokia.com; x-originating-ip: [2607:fea8:e31f:6800:38ad:fc4:3736:60df] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: 5709c69b-2856-4ffa-a453-08d8c3d240e8 x-ms-traffictypediagnostic: DM6PR08MB4572: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:10000; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 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 x-forefront-antispam-report: CIP:255.255.255.255; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Enclosed are discussion materials for the meeting on Monday. We're going t= o reorder the topics as follows: > T2) IANA considerations: how are final RFC revision labels assigned ? > https://github.com/netmod-wg/yang-ver-dt/issues/59 > T3) YANG file naming when revision labels are being used (symbolic links? > @) ? > T1) Definition/meaning of BC vs NBC for config false nodes > https://github.com/netmod-wg/yang-ver-dt/issues/15 =20 > T4) SemVer: gaps in history, removing revision statements > https://github.com/netmod-wg/yang-ver-dt/issues/61 Jason > -----Original Message----- > From: netmod On Behalf Of Sterne, Jason > (Nokia - CA/Ottawa) > Sent: Friday, January 15, 2021 11:32 AM > To: netmod@ietf.org > Subject: Re: [netmod] Network Modeling (netmod) WG Virtual Meeting: > 2021-02-01 CHANGED >=20 > Hi all, >=20 > Hope to see many of you there. The discussions in the previous interim (D= ec > 2020) were lively and useful to progress this work. >=20 > (6:30am California / 9:30am Eastern / 3:30pm Europe / 10:30pm Beijing) >=20 > Topics for the meeting: >=20 > T1) Definition/meaning of BC vs NBC for config false nodes > https://github.com/netmod-wg/yang-ver-dt/issues/15 >=20 > T2) IANA considerations: how are final RFC revision labels assigned ? > https://github.com/netmod-wg/yang-ver-dt/issues/59 >=20 > T3) YANG file naming when revision labels are being used (symbolic links? > @) ? >=20 > T4) SemVer: gaps in history, removing revision statements > https://github.com/netmod-wg/yang-ver-dt/issues/61 >=20 > More materials will follow. >=20 > Rgds, > Jason >=20 > > -----Original Message----- > > From: netmod On Behalf Of IESG Secretary > > Sent: Friday, January 15, 2021 11:23 AM > > To: IETF-Announce > > Cc: netmod@ietf.org > > Subject: [netmod] Network Modeling (netmod) WG Virtual Meeting: 2021- > > 02-01 CHANGED > > > > MEETING DETAILS HAVE CHANGED. SEE LATEST DETAILS BELOW. > > > > The Network Modeling (netmod) WG will hold > > a virtual interim meeting on 2021-02-01 from 09:30 to 11:00 > > America/New_York (14:30 to 16:00 UTC). > > > > Agenda: > > NETMOD Agenda for Interim (virtual) > > > > Date February 1, 2021 > > Start Time 14:30 UTC > > Duration 90 minutes > > > > Time Zone Converter: > > > > > https://www.timeanddate.com/worldclock/converter.html?iso=3D20210201T1 > > > 43000&p1=3D1440&p2=3D37&p3=3D438&p4=3D33&p5=3D248&a > > mp;p6=3D224&p7=3D179 > > Slides: > > https://datatracker.ietf.org/meeting/interim-2021-netmod- > > 01/session/netmodNotes > > Notes & BlueSheet: > > https://codimd.ietf.org/notes-ietf-interim-2021-netmod-01-netmod > > WebEx: > > > > > https://ietf.webex.com/ietf/j.php?MTID=3Dm8ee8976e972cc17b725f3ce1900b > > 0cd0 > > Jabber: > > xmpp:netmod@jabber.ietf.org?join > > > > Agenda: > > > > 1 Topic Intro & Administrivia > > Presenter: Chairs > > > > 2 Topic Module Versioning: > > Presenter: Authors > > Follow on to https://datatracker.ietf.org/meeting/interim-2020-netmod- > > 03/session/netmod > > Virtual Bluesheet > > > > > > Information about remote participation: > > > https://ietf.webex.com/ietf/j.php?MTID=3Dm8ee8976e972cc17b725f3ce1900b > > 0cd0 > > > > _______________________________________________ > > netmod mailing list > > netmod@ietf.org > > https://www.ietf.org/mailman/listinfo/netmod > _______________________________________________ > netmod mailing list > netmod@ietf.org > https://www.ietf.org/mailman/listinfo/netmod --_004_DM6PR08MB508413FE35AA9F639EB725E99BBA9DM6PR08MB5084namp_ Content-Type: application/vnd.openxmlformats-officedocument.presentationml.presentation; name="slides-interim-2021-feb-netmod-01-revision-label-filename.pptx" Content-Description: slides-interim-2021-feb-netmod-01-revision-label-filename.pptx Content-Disposition: attachment; filename="slides-interim-2021-feb-netmod-01-revision-label-filename.pptx"; size=51831; creation-date="Thu, 28 Jan 2021 15:55:42 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SPF_HELO_NONE=0.001, SPF_NONE=0.001, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Authentication-Results: ietfa.amsl.com (amavisd-new); dkim=pass (1024-bit key) header.d=amazonses.com Received: from mail.ietf.org ([4.31.198.44]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4-vBnp1fjPVr for ; Sat, 30 Jan 2021 09:10:12 -0800 (PST) Received: from a48-95.smtp-out.amazonses.com (a48-95.smtp-out.amazonses.com [54.240.48.95]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) by ietfa.amsl.com (Postfix) with ESMTPS id B64233A0C9C for ; Sat, 30 Jan 2021 09:10:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/simple; s=224i4yxa5dv7c2xz3womw6peuasteono; d=amazonses.com; t=1612026610; h=From:Mime-Version:Content-Type:Subject:Date:References:To:Message-Id:Feedback-ID; bh=v8EEHzJrvd/3lp6TpvbxHLCmoV3xfn8b31kyZlBh6LU=; b=hyuxoLgfcSDP8fNj8KAtbY2nNLyeKCE/BccXFePp7C6n+7uC1v5kgyipZTklYO3H q8HLv0T74pHvIN/URKfywkwkUO7HGWMJC2ZGwNQkZDFCYYA6vfbh0vhFpf6S62FU9YQ T7Gm0X+qySg7u+aSL/ANFW0k6w20+3GoNZyO6D7I= From: Kent Watsen Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) Content-Type: multipart/alternative; boundary="Apple-Mail=_4420BF86-0A88-4787-9498-61A7E13B4250" X-Priority: 3 Date: Sat, 30 Jan 2021 17:10:09 +0000 References: <1684132479.3772201610726832270.JavaMail.nobody@rva2rmd101.webex.com> To: "netmod@ietf.org" X-Mail-Calendar-Part: Yes Message-ID: <010001775445ff80-f95d5d0d-8bda-4524-b092-cf3a1c2a5865-000000@email.amazonses.com> X-Mailer: Apple Mail (2.3608.80.23.2.2) X-SES-Outgoing: 2021.01.30-54.240.48.95 Feedback-ID: 1.us-east-1.DKmIRZFhhsBhtmFMNikgwZUWVrODEw9qVcPhqJEI2DA=:AmazonSES Archived-At: Subject: [netmod] Reminder: NETMOD Versioning Interim - Feb 20221 X-BeenThere: netmod@ietf.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: NETMOD WG list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 30 Jan 2021 17:10:14 -0000 --Apple-Mail=_4420BF86-0A88-4787-9498-61A7E13B4250 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii NETMOD is hosting a virtual interim this coming Monday (in ~45 hours). ICS file attached to this message. NETMOD Agenda for Interim (virtual) Date February 1, 2021 Start Time 14:30 UTC Duration 90 minutes Time Zone Converter: = https://www.timeanddate.com/worldclock/converter.html?iso=3D20210201T14300= 0&p1=3D1440&p2=3D37&p3=3D438&p4=3D33&p5=3D248&p6=3D224&p7=3D179 Slides: = https://datatracker.ietf.org/meeting/interim-2021-netmod-01/session/netmod= Notes Notes & BlueSheet: https://codimd.ietf.org/notes-ietf-interim-2021-netmod-01-netmod WebEx: = https://ietf.webex.com/ietf/j.php?MTID=3Dm8ee8976e972cc17b725f3ce1900b0cd0= Jabber: xmpp:netmod@jabber.ietf.org?join Agenda: 1 Topic Intro & Administrivia Presenter: Chairs 2 Topic Module Versioning: Presenter: Authors Follow on to = https://datatracker.ietf.org/meeting/interim-2020-netmod-03/session/netmod= Virtual Bluesheet > Begin forwarded message: >=20 > From: NETMOD Working Group > Subject: Webex meeting changed: NetMod YANG Versioning Interim - Feb = 20221 > Date: January 15, 2021 at 11:07:12 AM EST > To: netmod-chairs@ietf.org > Resent-From: > Resent-To: joelja@bogus.com, kent+ietf@watsen.net, lberger@labn.net > Reply-To: netmod-chairs@ietf.org >=20 > =20 > NETMOD Working Group changed the Webex meeting information. >=20 > =20 > When it's time, join the Webex meeting here. >=20 > =20 > =20 > Monday, February 1, 2021 > 9:30 am | (UTC-05:00) Eastern Time (US & Canada) | 1 hr 30 mins > =20 > Join meeting = > =20 > More ways to join: > Join from the meeting link > = https://ietf.webex.com/ietf/j.php?MTID=3Dm8ee8976e972cc17b725f3ce1900b0cd0= = > =20 > Join by meeting number > Meeting number (access code): 178 198 8377 > Meeting password: Versioning > =20 > Tap to join from a mobile device (attendees only) > +1-650-479-3208,,1781988377## = Call-in toll number = (US/Canada) > =20 > Join by phone > 1-650-479-3208 Call-in toll number (US/Canada) > Global call-in numbers = > =20 > Join from a video system or application > Dial 1781988377@ietf.webex.com > You can also dial 173.243.2.68 and enter your meeting number. > =20 > Join using Microsoft Lync or Microsoft Skype for Business > Dial 1781988377.ietf@lync.webex.com = > =20 > =20 > Need help? Go to https://help.webex.com > =20 --Apple-Mail=_4420BF86-0A88-4787-9498-61A7E13B4250 Content-Type: multipart/mixed; boundary="Apple-Mail=_5D6870C6-F221-4B2D-ADF1-0273778CBB05" --Apple-Mail=_5D6870C6-F221-4B2D-ADF1-0273778CBB05 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=us-ascii NETMOD is hosting a virtual interim this coming Monday (in = ~45 hours).

ICS file = attached to this message.

NETMOD Agenda for Interim = (virtual)

Date =            February 1, 2021
Start Time      14:30 UTC
Duration        90 minutes

Time Zone = Converter:
     https://www.timeanddate.com/worldclock/converter.html?iso=3D202= 10201T143000&p1=3D1440&p2=3D37&p3=3D438&p4=3D33&p5=3D2= 48&p6=3D224&p7=3D179
Slides:
     https://datatracker.ietf.org/meeting/interim-2021-netmod-01/ses= sion/netmodNotes
Notes & = BlueSheet:
    https://codimd.ietf.org/notes-ietf-interim-2021-netmod-01-netmo= d
WebEx:
    https://ietf.webex.com/ietf/j.php?MTID=3Dm8ee8976e972cc17b725f3= ce1900b0cd0
Jabber:
  =   xmpp:netmod@jabber.ietf.org?join

Agenda:

1       Topic   = Intro & Administrivia
Presenter:     =  Chairs

2 = Topic Module Versioning:
Presenter: = Authors
Follow on to
https://datatracker.ietf.org/meeting/interim-2020-netmod-03/ses= sion/netmod
Virtual = Bluesheet



Begin forwarded message:

From: = NETMOD Working Group <messenger@webex.com>
Subject: = Webex meeting = changed: NetMod YANG Versioning Interim - Feb 20221
Date: = January 15, 2021 at 11:07:12 AM = EST
To: = netmod-chairs@ietf.org
Resent-From: = <alias-bounces@ietf.org>
Resent-To: = joelja@bogus.com, kent+ietf@watsen.net, = lberger@labn.net
Reply-To: = netmod-chairs@ietf.org

 
 

NETMOD Working Group changed the Webex = meeting information.

 

When it's time, join the Webex = meeting here.

 
Monday, = February 1, 2021
9:30 = am  |  (UTC-05:00) Eastern Time (US & = Canada)  |  1 hr 30 = mins
 
Join = meeting
 
More ways to = join:
Join from the meeting link
https://ietf.webex.com/ietf/j.php?MTID=3Dm8ee8976e972cc17b725f3= ce1900b0cd0
 
Join = by meeting number
Meeting = number (access code): 178 198 8377
Meeting = password: Versioning
 
Tap = to join from a mobile device (attendees only)
+1-650-479-3208,,1781988377## Call-in toll number = (US/Canada)
 
Join by = phone
1-650-479-3208 Call-in toll number = (US/Canada)
Global call-in = numbers
 
Join from a video system or = application
Dial 1781988377@ietf.webex.com
You can also dial 173.243.2.68 and enter your meeting = number.
 
Join = using Microsoft Lync or Microsoft Skype for Business
Dial 1781988377.ietf@lync.webex.com
 Need help? Go to https://help.webex.com
 
 
= --Apple-Mail=_5D6870C6-F221-4B2D-ADF1-0273778CBB05 Content-Disposition: attachment; filename="Mail Attachment.ics" Content-Type: text/calendar; x-mac-hide-extension=yes; x-unix-mode=0644; name="Mail Attachment.ics" Content-Transfer-Encoding: quoted-printable BEGIN:VCALENDAR=0D=0APRODID:-//Microsoft=20Corporation//Outlook=2010.0=20= MIMEDIR//EN=0D=0AVERSION:2.0=0D=0AMETHOD:REQUEST=0D=0ABEGIN:VTIMEZONE=0D=0A= TZID:America/New_York=0D=0A= TZURL:http://tzurl.org/zoneinfo-outlook/America/New_York=0D=0A= X-LIC-LOCATION:America/New_York=0D=0ABEGIN:DAYLIGHT=0D=0A= TZOFFSETFROM:-0500=0D=0ATZOFFSETTO:-0400=0D=0ATZNAME:EDT=0D=0A= DTSTART:19700308T020000=0D=0ARRULE:FREQ=3DYEARLY;BYMONTH=3D3;BYDAY=3D2SU=0D= =0AEND:DAYLIGHT=0D=0ABEGIN:STANDARD=0D=0ATZOFFSETFROM:-0400=0D=0A= TZOFFSETTO:-0500=0D=0ATZNAME:EST=0D=0ADTSTART:19701101T020000=0D=0A= RRULE:FREQ=3DYEARLY;BYMONTH=3D11;BYDAY=3D1SU=0D=0AEND:STANDARD=0D=0A= END:VTIMEZONE=0D=0ABEGIN:VEVENT=0D=0ADTSTAMP:20210115T160712Z=0D=0A= ATTENDEE;CN=3D"NETMOD=20Working=20= Group";ROLE=3DREQ-PARTICIPANT;RSVP=3DTRUE:MAILTO:netmod-chairs@ietf.org=0D= =0AORGANIZER;CN=3D"NETMOD=20Working=20= Group":MAILTO:netmod-chairs@ietf.org=0D=0A= DTSTART;TZID=3DAmerica/New_York:20210201T093000=0D=0A= DTEND;TZID=3DAmerica/New_York:20210201T110000=0D=0A= LOCATION:https://ietf.webex.com/ietf/j.php?MTID=3Dm8ee8976e972cc17b725f3ce= 1900b0cd0=0D=0ATRANSP:OPAQUE=0D=0ASEQUENCE:1610726832=0D=0A= UID:980882d2-09ea-468e-8de2-b6906c6ad6f4=0D=0ADESCRIPTION:\n\n\n\n\nJOIN=20= WEBEX=20= MEETING\nhttps://ietf.webex.com/ietf/j.php?MTID=3Dm8ee8976e972cc17b725f3ce= 1900b0cd0\nMeeting=20number=20(access=20code):=20178=20198=20= 8377\n\nMeeting=20password:=20Versioning\n\n\n\nTAP=20TO=20JOIN=20FROM=20= A=20MOBILE=20DEVICE=20(ATTENDEES=20ONLY)\n+1-650-479-3208,,1781988377##=20= tel:%2B1-650-479-3208,,*01*1781988377%23%23*01*=20Call-in=20toll=20= number=20(US/Canada)\n\n\nJOIN=20BY=20PHONE\n1-650-479-3208=20Call-in=20= toll=20number=20(US/Canada)\n\nGlobal=20call-in=20= numbers\nhttps://ietf.webex.com/ietf/globalcallin.php?MTID=3Dmb91ef6e2caa7= 090a869d36f74f0ed9fe\n\n\nJOIN=20FROM=20A=20VIDEO=20SYSTEM=20OR=20= APPLICATION\nDial=20sip:1781988377@ietf.webex.com\nYou=20can=20also=20= dial=20173.243.2.68=20and=20enter=20your=20meeting=20number.\n\n\nJoin=20= using=20Microsoft=20Lync=20or=20Microsoft=20Skype=20for=20Business\nDial=20= sip:1781988377.ietf@lync.webex.com\n\n\n\n\n\nCan't=20join=20the=20= meeting?\nhttps://collaborationhelp.cisco.com/article/WBX000029055\n\n\nIM= PORTANT=20NOTICE:=20Please=20note=20that=20this=20Webex=20service=20= allows=20audio=20and=20other=20information=20sent=20during=20the=20= session=20to=20be=20recorded,=20which=20may=20be=20discoverable=20in=20a=20= legal=20matter.=20By=20joining=20this=20session,=20you=20automatically=20= consent=20to=20such=20recordings.=20If=20you=20do=20not=20consent=20to=20= being=20recorded,=20discuss=20your=20concerns=20with=20the=20host=20or=20= do=20not=20join=20the=20session.\n=0D=0A= X-ALT-DESC;FMTTYPE=3Dtext/html:\ntable=20{\n=09= border-collapse:=20separate;=20width=20=3D100%;=09border:=200;=09= border-spacing:=200;}\n\ntr=20{\n=09line-height:=2018px;}\n\na,=20td=20= {\n=09font-size:=2014px;=09font-family:=20Arial;=09color:=20#333;=09= word-wrap:=20break-word;=09word-break:=20normal;=09padding:=20= 0;}\n\n.title=20{\n=09font-size:=2028px;}\n\n.image=20{\n=09width:=20= auto;=09max-width:=20auto;}\n\n.footer=20{\n=09width:=20604px;}\n\n.main=20= {\n\n}@media=20screen=20and=20(max-device-width:=20800px)=20{\n=09.title=20= {\n=09=09font-size:=2022px=20!important;=09}\n=09.image=20{\n=09=09= width:=20auto=20!important;=09=09max-width:=20100%=20!important;=09}\n=09= .footer=20{\n=09=09width:=20100%=20!important;=09=09max-width:=20604px=20= !important\n=09}\n=09.main=20{\n=09=09width:=20100%=20!important;=09=09= max-width:=20604px=20!important\n=09}\n}\n\n\n\n=09 \n=09\n=09=09\n=09=09=09\n\n\n\n\n\n=09=09=09\n=09=09=09=09\n=09=09=09=09=09= \n=09=09=09=09\n=09=09
\n=09=09=09=09=09=09When=20it's=20time,=20join=20the=20Webex=20meeting=20= here.\n=09=09=09=09=09
\n=20= =20=20=20=20=20=20=20\n=20=20=20=20=20=20=20=20=09 \n=09=09=09\n=09=09=09=09\n=09=09=09=09=09\n=09=09=09=09=09=09\n=09=09=09=09=09=09=09= Join=20meeting\n=09=09=09=09=09=09= \n=09=09=09=09=09
\n=09=09=09=09\n=09=09=09\n=09=09= \n=09=09\n=09=09=09 \n=09=09=09\n=09=09= =09=09\n=20=20= =20=20=20=20=20=20=09\n=20=20=20=20=20=20=20=20=20=20=20=20 \n=20=20=20=20=20=20=20=20=09\n=09=09=09=09= \n=20=20=20=20=20=20=20=20=09\n=20=20=20=20=20=20=20=20=09= \n=09=09=09=09\n=20=20=20=20=20=20=20=20=09= \n=20=20=20=20=20=20=20=20=09 \n=09=09=09\n=09=09= =09=09\n=20= =20=20=20=20=20=20=20=09\n=09=09=09\n=09=09=09=09\n=09= =09=09\n=09=09
\n=09=09=09=09=09=09More=20ways=20to=20join:\n=09=09=09=09
\n=09=09=09=09=09=09Join=20from=20the=20meeting=20link\n=09=09=09=09=
\n=09=09=09=09=09=09https://ietf.webex.com/ietf/j.php?MTID=3Dm8ee8976e972cc17b725f3ce19= 00b0cd0\n=09=09=09=09
\n=09=09=09=09=09=09Join=20by=20meeting=20number\n=09=09=09=09
\n=09=09=09= =09=09Meeting=20= number=20(access=20code):=20178=20198=208377\n=09=09=09=09
\n=09=09
Meeting=20= password:Versioning
\n\n=20\n\n =20
Tap=20to=20join=20from=20= a=20mobile=20device=20(attendees=20only)=20 =20
+1-650-479-3208,,1781988377##=20Call-in=20toll=20number=20= (US/Canada) =20

Join=20by=20phone=20 =20
1-650-479-3208=20Call-in=20toll=20= number=20(US/Canada)=20 =20
Global=20= call-in=20numbers =20


\n\n 
\n\nJoin=20from=20a=20video=20system=20or=20= application
Dial=201781988377@ietf.webex.com =20
You=20can=20also=20dial=20= 173.243.2.68=20and=20enter=20your=20meeting=20number.=20 =20=
 =20
\n\nJoin=20using=20Microsoft=20Lync=20or=20Microsoft=20Skype=20for=20= BusinessDial=201781988377.ietf@lync.webex.co= m\n\n=09 
\n=09\n\n=09=09= =09\n=20= =20=20=20=20=20=20=20=20=20=20=20=20=20=20=20 \n=09=09=09=09\n=09=09=09=09=09Need=20help?=20Go=20to=20https://help.webex.com\n=09=09=09=09=09= \n=09=09=09=09\n=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=20=  \n=09=09=09\n=09= =09\n=09\n\n=0D=0ASUMMARY:NetMod=20YANG=20Versioning=20= Interim=20-=20Feb=2020221=0D=0APRIORITY:5=0D=0ACLASS:PUBLIC=0D=0A= BEGIN:VALARM=0D=0ATRIGGER:-PT5M=0D=0AACTION:DISPLAY=0D=0A= DESCRIPTION:Reminder=0D=0AEND:VALARM=0D=0AEND:VEVENT=0D=0AEND:VCALENDAR=0D= =0A= --Apple-Mail=_5D6870C6-F221-4B2D-ADF1-0273778CBB05 Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=us-ascii
--Apple-Mail=_5D6870C6-F221-4B2D-ADF1-0273778CBB05 Content-Disposition: attachment; filename=Webex_Meeting.ics Content-Type: text/calendar; x-unix-mode=0644; name="Webex_Meeting.ics" Content-Transfer-Encoding: quoted-printable BEGIN:VCALENDAR=0D=0APRODID:-//Microsoft=20Corporation//Outlook=2010.0=20= MIMEDIR//EN=0D=0AVERSION:2.0=0D=0AMETHOD:REQUEST=0D=0ABEGIN:VTIMEZONE=0D=0A= TZID:America/New_York=0D=0A= TZURL:http://tzurl.org/zoneinfo-outlook/America/New_York=0D=0A= X-LIC-LOCATION:America/New_York=0D=0ABEGIN:DAYLIGHT=0D=0A= TZOFFSETFROM:-0500=0D=0ATZOFFSETTO:-0400=0D=0ATZNAME:EDT=0D=0A= DTSTART:19700308T020000=0D=0ARRULE:FREQ=3DYEARLY;BYMONTH=3D3;BYDAY=3D2SU=0D= =0AEND:DAYLIGHT=0D=0ABEGIN:STANDARD=0D=0ATZOFFSETFROM:-0400=0D=0A= TZOFFSETTO:-0500=0D=0ATZNAME:EST=0D=0ADTSTART:19701101T020000=0D=0A= RRULE:FREQ=3DYEARLY;BYMONTH=3D11;BYDAY=3D1SU=0D=0AEND:STANDARD=0D=0A= END:VTIMEZONE=0D=0ABEGIN:VEVENT=0D=0ADTSTAMP:20210115T160712Z=0D=0A= ATTENDEE;CN=3D"NETMOD=20Working=20= Group";ROLE=3DREQ-PARTICIPANT;RSVP=3DTRUE:MAILTO:netmod-chairs@ietf.org=0D= =0AORGANIZER;CN=3D"NETMOD=20Working=20= Group":MAILTO:netmod-chairs@ietf.org=0D=0A= DTSTART;TZID=3DAmerica/New_York:20210201T093000=0D=0A= DTEND;TZID=3DAmerica/New_York:20210201T110000=0D=0A= LOCATION:https://ietf.webex.com/ietf/j.php?MTID=3Dm8ee8976e972cc17b725f3ce= 1900b0cd0=0D=0ATRANSP:OPAQUE=0D=0ASEQUENCE:1610726832=0D=0A= UID:980882d2-09ea-468e-8de2-b6906c6ad6f4=0D=0ADESCRIPTION:\n\n\n\n\nJOIN=20= WEBEX=20= MEETING\nhttps://ietf.webex.com/ietf/j.php?MTID=3Dm8ee8976e972cc17b725f3ce= 1900b0cd0\nMeeting=20number=20(access=20code):=20178=20198=20= 8377\n\nMeeting=20password:=20Versioning\n\n\n\nTAP=20TO=20JOIN=20FROM=20= A=20MOBILE=20DEVICE=20(ATTENDEES=20ONLY)\n+1-650-479-3208,,1781988377##=20= tel:%2B1-650-479-3208,,*01*1781988377%23%23*01*=20Call-in=20toll=20= number=20(US/Canada)\n\n\nJOIN=20BY=20PHONE\n1-650-479-3208=20Call-in=20= toll=20number=20(US/Canada)\n\nGlobal=20call-in=20= numbers\nhttps://ietf.webex.com/ietf/globalcallin.php?MTID=3Dmb91ef6e2caa7= 090a869d36f74f0ed9fe\n\n\nJOIN=20FROM=20A=20VIDEO=20SYSTEM=20OR=20= APPLICATION\nDial=20sip:1781988377@ietf.webex.com\nYou=20can=20also=20= dial=20173.243.2.68=20and=20enter=20your=20meeting=20number.\n\n\nJoin=20= using=20Microsoft=20Lync=20or=20Microsoft=20Skype=20for=20Business\nDial=20= sip:1781988377.ietf@lync.webex.com\n\n\n\n\n\nCan't=20join=20the=20= meeting?\nhttps://collaborationhelp.cisco.com/article/WBX000029055\n\n\nIM= PORTANT=20NOTICE:=20Please=20note=20that=20this=20Webex=20service=20= allows=20audio=20and=20other=20information=20sent=20during=20the=20= session=20to=20be=20recorded,=20which=20may=20be=20discoverable=20in=20a=20= legal=20matter.=20By=20joining=20this=20session,=20you=20automatically=20= consent=20to=20such=20recordings.=20If=20you=20do=20not=20consent=20to=20= being=20recorded,=20discuss=20your=20concerns=20with=20the=20host=20or=20= do=20not=20join=20the=20session.\n=0D=0A= X-ALT-DESC;FMTTYPE=3Dtext/html:\ntable=20{\n=09= border-collapse:=20separate;=20width=20=3D100%;=09border:=200;=09= border-spacing:=200;}\n\ntr=20{\n=09line-height:=2018px;}\n\na,=20td=20= {\n=09font-size:=2014px;=09font-family:=20Arial;=09color:=20#333;=09= word-wrap:=20break-word;=09word-break:=20normal;=09padding:=20= 0;}\n\n.title=20{\n=09font-size:=2028px;}\n\n.image=20{\n=09width:=20= auto;=09max-width:=20auto;}\n\n.footer=20{\n=09width:=20604px;}\n\n.main=20= {\n\n}@media=20screen=20and=20(max-device-width:=20800px)=20{\n=09.title=20= {\n=09=09font-size:=2022px=20!important;=09}\n=09.image=20{\n=09=09= width:=20auto=20!important;=09=09max-width:=20100%=20!important;=09}\n=09= .footer=20{\n=09=09width:=20100%=20!important;=09=09max-width:=20604px=20= !important\n=09}\n=09.main=20{\n=09=09width:=20100%=20!important;=09=09= max-width:=20604px=20!important\n=09}\n}\n\n\n\n=09 \n=09\n=09=09\n=09=09=09\n\n\n\n\n\n=09=09=09\n=09=09=09=09\n=09=09=09=09=09= \n=09=09=09=09\n=09=09
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Global=20= call-in=20numbers =20


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Dial=201781988377@ietf.webex.com =20
You=20can=20also=20dial=20= 173.243.2.68=20and=20enter=20your=20meeting=20number.=20 =20=
 =20
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