Re: [yang-doctors] Small modules discussion from LSR [Fwd: [Lsr] When to augment LSR base YANG modules...]
Martin Bjorklund <mbj@tail-f.com> Tue, 02 April 2019 12:15 UTC
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Date: Tue, 02 Apr 2019 14:15:40 +0200
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Subject: Re: [yang-doctors] Small modules discussion from LSR [Fwd: [Lsr] When to augment LSR base YANG modules...]
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"Rob Wilton (rwilton)" <rwilton@cisco.com> wrote: > > > > -----Original Message----- > > From: Martin Bjorklund <mbj@tail-f.com> > > Sent: 02 April 2019 12:29 > > To: Rob Wilton (rwilton) <rwilton@cisco.com> > > Cc: chopps@chopps.org; yang-doctors@ietf.org; yingzhen.qu@huawei.com > > Subject: Re: [yang-doctors] Small modules discussion from LSR [Fwd: > > [Lsr] > > When to augment LSR base YANG modules...] > > > > "Rob Wilton (rwilton)" <rwilton@cisco.com> wrote: > > > > > > > > > > -----Original Message----- > > > > From: Christian Hopps <chopps@chopps.org> > > > > Sent: 02 April 2019 11:31 > > > > To: Rob Wilton (rwilton) <rwilton@cisco.com> > > > > Cc: Christian Hopps <chopps@chopps.org>; YANG Doctors <yang- > > > > doctors@ietf.org>; Yingzhen Qu <yingzhen.qu@huawei.com> > > > > Subject: Re: [yang-doctors] Small modules discussion from LSR [Fwd: > > > > [Lsr] > > > > When to augment LSR base YANG modules...] > > > > > > > > > > > > > On Apr 2, 2019, at 5:52 AM, Rob Wilton (rwilton) > > > > > <rwilton@cisco.com> > > > > wrote: > > > > > > > > > > Hi Chris, > > > > > > > > > > I don’t think that there is a one size fits all answer here. > > > > > > > > > > If the enhancement is small, and is likely to be reasonably widely > > > > > used then > > > > my view is that adding it as an optional feature to the base module > > > > is a better choice in the long term. > > > > > > > > > > If the feature is larger, or esoteric, and perhaps won’t be widely > > > > > deployed > > > > then I would think that putting it into a separate module might be a > > > > better choice. > > > > > > > > > > I actually think that it is the IETF process that is perhaps the > > > > > difficult thing > > > > here. I.e. I think that you want to republish a new revision of the > > > > base module, but in a way that gets processed more quickly by the > > > > IESG. > > > > E.g. > > > > request that they only review/comment on the diffs between the > > > > current revision and the previous one. Or somehow publish an > > > > updated revision of the module on github without assigning it a new > > > > RFC number every time. > > > > > > > > Yes, although I'm trying to do a couple things: > > > > > > > > - Get YANG management support added at the same time as the > > > > functionality, not as an after thought maybe someday, maybe never. > > > > > > I agree that this is definitely the right thing to do. > > > > > > > > > > - Reduce the cost of adding the YANG support. A stand-alone document > > > > is very expensive time and effort wise, separate IESG reviews, > > > > directorate reviews, last-calls. > > > > > > I agree. And rev'ing the base ISIS YANG model is likely to be just as > > > expensive. > > > > My suggestion was not to rev the base model, but have _one_ model with > > these "optional features", and rev that every time. > > [RW] I'm not sure I see the difference. Just less to update all the time. > Whatever minimal base draft that does the includes has to be updated > if a new include is added or changed. Yes. > Where would that updated base be published? Would that be included in > the extension RFC? Yes. > > > > I had wondered if we could use errata on the base vs doing a brand > > > > new bis version of the base module; however, this seems to be > > > > trading too much process overhead with perhaps not quite enough. > > > > > > > > To the first goal, I wrote that reverse metric module a couple days > > > > ago as an example. I have to wonder when or even if it would have > > > > gotten written (or the equivalent feature added) otherwise. Instead > > > > I suspect it would just get added into N vendors models as people > > > > move on to other things in the WG. > > > > > > > > In a perfect world I would add a YANG section to my functionality > > > > RFC that updated (not augment) the base module, but with augment > > > > style definition (i.e., so the entire huge base module doesn't need > > > > to be re-represented in the document). This would then cause the > > > > base document to get reissued with the changes. Sort of like IANA > > > > sections are capable of updating a registry. > > > > > > We almost want to just include a diff/patch to the base model into the > > > document. This is actually a little bit like how IEEE 802 update > > > their documents, and then they periodically roll their updates into > > > the base model. > > > > > > > > > > > > > > So maybe your github idea is like this, we create a module > > > > definition registry where the most up-to-date module definitions go, > > > > and then RFCs can update that using something like (or exactly like) > > > > augment to document the changes to the module in the individual > > > > RFCs. > > > > > > Yes. We want the review to only focus on the stuff that is new/added > > > rather than reviewing the whole module every time. > > > > > > Martin's suggestion of using submodules is another way to achieve > > > this. E.g. the actual module definition is split over multiple RFCs, > > > but I'm not that keen on submodules and I suspect that this will make > > > them hard to read in future. > > > > Note that we can "gc" the submodules and fold their contents into the > > main > > module, or perhaps a "top" submodule, when you have N submodules. > > True. > > > > > > > > I think that the real answer here is that YANG modules should not be > > > published in RFCs. Yes, they should go through a similar formal > > > review process for changes to the modules but without the overhead of > > > reviewing every change as a new document. > > > > Right. This is longer term though, since it requires a process > > update! > > Yes. > > But, if we think that this is the right long term plan perhaps we > should be writing up a draft to propose this to see what the WG > reaction is? Actually, Ignas is currently driving this. /martin
- [yang-doctors] Small modules discussion from LSR … Christian Hopps
- Re: [yang-doctors] Small modules discussion from … Martin Bjorklund
- Re: [yang-doctors] Small modules discussion from … Christian Hopps
- Re: [yang-doctors] Small modules discussion from … Rob Wilton (rwilton)
- Re: [yang-doctors] Small modules discussion from … Christian Hopps
- Re: [yang-doctors] Small modules discussion from … Rob Wilton (rwilton)
- Re: [yang-doctors] Small modules discussion from … Martin Bjorklund
- Re: [yang-doctors] Small modules discussion from … Acee Lindem (acee)
- Re: [yang-doctors] Small modules discussion from … Rob Wilton (rwilton)
- Re: [yang-doctors] Small modules discussion from … Acee Lindem (acee)
- Re: [yang-doctors] Small modules discussion from … Rob Wilton (rwilton)
- Re: [yang-doctors] Small modules discussion from … Martin Bjorklund
- Re: [yang-doctors] Small modules discussion from … Acee Lindem (acee)
- Re: [yang-doctors] Small modules discussion from … Reshad Rahman (rrahman)