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Re: [Idr] One week extension to WGLC for draft-ietf-idr-large-community

Jeffrey Haas <jhaas@pfrc.org> Wed, 16 November 2016 00:09 UTC

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Date: Tue, 15 Nov 2016 19:12:46 -0500
From: Jeffrey Haas <jhaas@pfrc.org>
To: Brian Dickson <brian.peter.dickson@gmail.com>
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Cc: bruno.decraene@orange.com, Robert Raszuk <robert@raszuk.net>, idr wg <idr@ietf.org>
Subject: Re: [Idr] One week extension to WGLC for draft-ietf-idr-large-community
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On Tue, Nov 15, 2016 at 12:44:04PM -0800, Brian Dickson wrote:
> Regardless of the rationale on the parts of AS1 and/or AS2, here is the
> semantic issue:
> A given community is a FLAG. You can use any number of DIFFERENT flags
> (community values), but each community value can only be "present" or
> "absent".

For what it's worth, I always explain communities as being a "set", in a
mathematical sense.

In that notion, A union A yields the set containing A, etc.

Match operations are typically either intersect or proper subset operations.

-- Jeff

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