Re: [core] [Anima] documenting SID usage in IETF specification

Michael Richardson <mcr+ietf@sandelman.ca> Thu, 13 September 2018 15:18 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: Core <core@ietf.org>, Andy Bierman <andy@yumaworks.com>
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Date: Thu, 13 Sep 2018 11:18:29 -0400
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Subject: Re: [core] [Anima] documenting SID usage in IETF specification
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{removed anima from CC list}

Carsten Bormann <cabo@tzi.org> wrote:
    > What Andy pointed out is that we also need to have an idea of how to
    > evolve a draft in a way that minimizes damage from changing those
    > numbers during the development of that draft.  So we need to start
    > allocating and managing SID numbers early in their lifetime, at least
    > from the point of time when a draft is becoming an “implementation
    > draft” (as opposed to just an idea that wants to be discussed).  That

Agreed.
I think that we will typically be need about ~100 per draft, sometimes as
many as 1000, but never 10,000.  100 is a very small number compared to the
size of the SID space.

I think that the early allocation process will work fine, once we have a
registry to allocate against.  The comi.space mechanism is even lighter
weight.

    > — have a more explicit way of designating drafts as Implementation
    > Drafts.  Basically, any SIDs allocated before that are without
    > protection, but once we have an Implementation Draft, the SIDs used in
    > that will not be re-used.  (Intermediate versions between
    > Implementation Drafts would again have any new SIDs in unprotected
    > state until another Implementation Draft is declared.)

I think that we used to call these "Proposed standards" :-)
I'm not sure we need to have this designation.  I think that SID numbers are
cheap enough that it's okay if some drafts consume some and then get
abandonned.   The numbers could be recycled 6 months after the draft expires.

    > — have a way to include the SID file in the document (draft, RFC).
    > This is not beautiful, but unless we invent another representation for
    > that information, that is the interchangeable form.  (If we do invent
    > another representation, maybe we should always use that?)

I suggest it be included as an appendix.

--
Michael Richardson <mcr+IETF@sandelman.ca>ca>, Sandelman Software Works
 -= IPv6 IoT consulting =-