Re: [netmod] augment YANG 1.0 with YANG 1.1 OK?
Martin Bjorklund <mbj@tail-f.com> Thu, 26 October 2017 10:10 UTC
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Date: Thu, 26 Oct 2017 12:10:26 +0200
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To: andy@yumaworks.com
Cc: rwilton@cisco.com, j.schoenwaelder@jacobs-university.de, netmod@ietf.org
From: Martin Bjorklund <mbj@tail-f.com>
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Subject: Re: [netmod] augment YANG 1.0 with YANG 1.1 OK?
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Andy Bierman <andy@yumaworks.com> wrote: > On Wed, Oct 25, 2017 at 12:49 PM, Martin Bjorklund <mbj@tail-f.com> wrote: > > > Andy Bierman <andy@yumaworks.com> wrote: > > > I think NMDA is creating much more complexity and disruption than is > > > required. > > > The original issue was the OpenConfig-style config/state trees. > > > The WG agreed that an RPC-based solution was needed so that the > > > YANG modules would not need to change (far too disruptive!). > > > > > > Then the IETF proceeds to redo all the YANG modules anyway. > > > Now the server is allowed to implement the same module differently in > > each > > > datastore. > > > Now comparing the configured and operational value is even harder than > > > before. > > > > > > None of this added complexity was in the OpenConfig proposal. > > > It was not even possible to have different features and deviations for > > the > > > same object in that proposal. > > > > Actually, this is not correct. In both OC and the old IETF split tree > > solutions, the configuration and operational state were modelled with > > duplicate nodes, and you could certainly deviate these nodes > > differently. > > > > This said, I share your concern about complexity. I also agree that > > the only model that makes the client simple is that if all objects in > > the config are also available with the same types in operational > > state. Otherwise comparison won't work (or be complicated). > > > > But at the same time, the converse is not true. I.e., if an object is > > present in operational, it doesn't have to be configurable. > > > > So what I think we want is that the schema for the conventional > > datastore is a subset of the schema for operational. > > > > This would allow an implementation that cannot support configuration > > of let's say the MTU, to deviate the mtu with "not-supported" in the > > conventional datastore, but it will still be available for inspection > > in operational. > > > > Does this make sense? > > > > OK -- deviations for not-supported make sense per datastore > to resolve the missing-object ambiguity problem. > It is not realistic to expect every object in a module to be able > to report its operational state in the same release. > It is better to report not-supported than return nothing or return the > configured value as a guess. > > If the admin-state and oper-state objects are different, 2 objects should > be used instead of per-datastore deviations of the syntax of 1 object. Agreed. So based on this, how about this text: The schema for <operational> MUST be a superset of the combined schema used in all configuration datastores except that YANG nodes supported in a configuration datastore MAY be omitted from <operational> if a server is not able to accurately report them. /martin
- [netmod] augment YANG 1.0 with YANG 1.1 OK? Andy Bierman
- Re: [netmod] augment YANG 1.0 with YANG 1.1 OK? Martin Bjorklund
- Re: [netmod] augment YANG 1.0 with YANG 1.1 OK? Andy Bierman
- Re: [netmod] augment YANG 1.0 with YANG 1.1 OK? Juergen Schoenwaelder
- Re: [netmod] augment YANG 1.0 with YANG 1.1 OK? Andy Bierman
- Re: [netmod] augment YANG 1.0 with YANG 1.1 OK? Andy Bierman
- Re: [netmod] augment YANG 1.0 with YANG 1.1 OK? Juergen Schoenwaelder
- Re: [netmod] augment YANG 1.0 with YANG 1.1 OK? Juergen Schoenwaelder
- Re: [netmod] augment YANG 1.0 with YANG 1.1 OK? Andy Bierman
- Re: [netmod] augment YANG 1.0 with YANG 1.1 OK? Robert Wilton
- Re: [netmod] augment YANG 1.0 with YANG 1.1 OK? Andy Bierman
- Re: [netmod] augment YANG 1.0 with YANG 1.1 OK? Juergen Schoenwaelder
- Re: [netmod] augment YANG 1.0 with YANG 1.1 OK? Andy Bierman
- Re: [netmod] augment YANG 1.0 with YANG 1.1 OK? Juergen Schoenwaelder
- Re: [netmod] augment YANG 1.0 with YANG 1.1 OK? Andy Bierman
- Re: [netmod] augment YANG 1.0 with YANG 1.1 OK? Robert Wilton
- Re: [netmod] augment YANG 1.0 with YANG 1.1 OK? Martin Bjorklund
- Re: [netmod] augment YANG 1.0 with YANG 1.1 OK? Andy Bierman
- Re: [netmod] augment YANG 1.0 with YANG 1.1 OK? Andy Bierman
- Re: [netmod] augment YANG 1.0 with YANG 1.1 OK? Martin Bjorklund
- Re: [netmod] augment YANG 1.0 with YANG 1.1 OK? Andy Bierman
- Re: [netmod] augment YANG 1.0 with YANG 1.1 OK? Andy Bierman
- Re: [netmod] augment YANG 1.0 with YANG 1.1 OK? Martin Bjorklund
- [netmod] Action and RPC statements [was Re: augme… Robert Wilton
- Re: [netmod] augment YANG 1.0 with YANG 1.1 OK? Robert Wilton
- Re: [netmod] Action and RPC statements [was Re: a… Randy Presuhn
- Re: [netmod] Action and RPC statements [was Re: a… Andy Bierman
- Re: [netmod] Action and RPC statements [was Re: a… Randy Presuhn
- Re: [netmod] Action and RPC statements Martin Bjorklund
- Re: [netmod] Action and RPC statements Robert Wilton
- Re: [netmod] Action and RPC statements Juergen Schoenwaelder
- Re: [netmod] Action and RPC statements Kent Watsen
- Re: [netmod] Action and RPC statements Robert Wilton
- Re: [netmod] Action and RPC statements Juergen Schoenwaelder
- Re: [netmod] Action and RPC statements Robert Wilton
- Re: [netmod] Action and RPC statements Andy Bierman
- Re: [netmod] Action and RPC statements Randy Presuhn
- Re: [netmod] Action and RPC statements Andy Bierman
- Re: [netmod] Action and RPC statements Alexander Clemm
- Re: [netmod] Action and RPC statements Phil Shafer
- Re: [netmod] Action and RPC statements Robert Wilton
- Re: [netmod] Action and RPC statements Robert Wilton
- Re: [netmod] Action and RPC statements Juergen Schoenwaelder
- Re: [netmod] Action and RPC statements Andy Bierman
- Re: [netmod] Action and RPC statements Alexander Clemm
- Re: [netmod] Action and RPC statements Alexander Clemm
- Re: [netmod] Action and RPC statements Juergen Schoenwaelder
- Re: [netmod] Action and RPC statements Phil Shafer
- Re: [netmod] Action and RPC statements Andy Bierman
- Re: [netmod] Action and RPC statements Martin Bjorklund
- Re: [netmod] Action and RPC statements Lou Berger
- Re: [netmod] Action and RPC statements Juergen Schoenwaelder
- Re: [netmod] Action and RPC statements Martin Bjorklund
- Re: [netmod] Action and RPC statements Lou Berger
- Re: [netmod] Action and RPC statements Robert Wilton
- Re: [netmod] Action and RPC statements Lou Berger
- Re: [netmod] Action and RPC statements Robert Wilton
- Re: [netmod] Action and RPC statements Lou Berger
- Re: [netmod] Action and RPC statements Juergen Schoenwaelder
- [netmod] Reset tags RPC [was Re: Action and RPC s… Robert Wilton
- Re: [netmod] Action and RPC statements Lou Berger
- Re: [netmod] Action and RPC statements Andy Bierman
- Re: [netmod] Action and RPC statements Juergen Schoenwaelder
- Re: [netmod] Action and RPC statements Robert Wilton
- Re: [netmod] Action and RPC statements Lou Berger
- Re: [netmod] Action and RPC statements Robert Wilton
- Re: [netmod] Action and RPC statements Lou Berger
- Re: [netmod] Action and RPC statements t.petch