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Re: [Anima] [saag] towards using of MUST-/SHOULD+/SHOULD- in draft-ietf-autonomic-control-plane-24

Brian E Carpenter <brian.e.carpenter@gmail.com> Sat, 27 June 2020 04:05 UTC

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To: Nico Williams <nico@cryptonector.com>, Michael Richardson <mcr+ietf@sandelman.ca>
Cc: Toerless Eckert <tte@cs.fau.de>, Russ Housley <housley@vigilsec.com>, Ben Kaduk <kaduk@mit.edu>, anima@ietf.org, saag@ietf.org
References: <20200624023407.GA41244@faui48f.informatik.uni-erlangen.de> <C71BDB46-A15A-48EC-BC4D-68CA9A7C1DFB@vigilsec.com> <14352.1593208951@localhost> <20200626220847.GX3100@localhost> <30682.1593220519@localhost> <20200627030622.GZ3100@localhost>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Sat, 27 Jun 2020 16:05:41 +1200
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Subject: Re: [Anima] [saag] towards using of MUST-/SHOULD+/SHOULD- in draft-ietf-autonomic-control-plane-24
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On 27-Jun-20 15:06, Nico Williams wrote:
> On Fri, Jun 26, 2020 at 09:15:19PM -0400, Michael Richardson wrote:
>> 1) So, BCPs can point to multiple documents.
>>    BCP14 actually is RFC2119 and RFC8174 now, so we can add a third document if
>>    desired. That is, it's cheaper to not spin 2119.
> 
> Sure.  Plus, RFC2119 is iconic, and used far and wide outside the IETF.
> 
>> 2) I'm not claiming others won't use it, I just don't know if they will.
>>    Crypto progresses... what other things do that in the same way?
> 
> Any time we have a migration from one [sub]protocol to a newer one and
> need to retain support for the old one for a while, we will need
> something like SHOULD-.  I agree this comes up most often in the context
> of cryptographic algorithms.

Interesting discussion but I want to see the ACP in the RFC Editor queue, can we just do what is required for that and nothing else?

I am about a millimetre away from proposing to recall the GRASP spec from the RFC Editor so that we can amputate its normative dependency on the ACP. I really wish I'd done that a year ago.

    Grumpy Brian

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