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Re: [trill] seeking help to understand a line from TRILL-ESADI draft

Thomas Narten <narten@us.ibm.com> Thu, 19 July 2012 10:44 UTC

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To: Donald Eastlake <d3e3e3@gmail.com>
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Comments: In-reply-to Donald Eastlake <d3e3e3@gmail.com> message dated "Thu, 19 Jul 2012 02:25:33 -0400."
Date: Thu, 19 Jul 2012 06:45:17 -0400
From: Thomas Narten <narten@us.ibm.com>
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Cc: Swet kumar <swet.kumar@ipinfusion.com>, "trill@ietf.org" <trill@ietf.org>
Subject: Re: [trill] seeking help to understand a line from TRILL-ESADI draft
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Donald Eastlake <d3e3e3@gmail.com> writes:

> Hi Thomas,

> On Wed, Jul 18, 2012 at 2:15 PM, Thomas Narten <narten@us.ibm.com> wrote:
> > Seems to me that the MAY sentence all by itself is not helpful.
> >
> > If sending occasionaly ESADI-CSNPs increases robustness, IMO, the spec
> > should say that and explain which scenarios its useful in. And then,
> > MAY doens't seem right either. SHOULD would seem to make more sense...

> I'm fine with SHOULD and including a sentence or two of justfication.
> But it isn't actually occasionally at random, it is under specific
> circumstances that indicate something is wrong and CSNPs are not being
> received from the DRB.

Then by all means please have the spec say that. The whole point of a
standard is to provide useful guidance to an implementor on whether
and when something should be implemented. Many (most?) implementors
will not be familiar with TRILL and its long WG history and will just
be going by what the spec says. 

Thomas

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