Re: [Idr] Review of draft-ietf-large-community-06.txt

Jeffrey Haas <jhaas@pfrc.org> Fri, 04 November 2016 10:34 UTC

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From: Jeffrey Haas <jhaas@pfrc.org>
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Date: Fri, 4 Nov 2016 06:34:27 -0400
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To: Geoff Huston <gih@apnic.net>
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Subject: Re: [Idr] Review of draft-ietf-large-community-06.txt
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> On Nov 4, 2016, at 4:59 AM, Geoff Huston <gih@apnic.net> wrote:
> 
> I just noted that RFC1997 and RFC4360 had these constraints.
> 
> It seems strange to me that an implementation would handle aggregation differently, treating communities and extended communities one way and large communities in a subtly different manner.
> 
> Frankly I would prefer to see a consistent treatment of communities in the case of aggregation, and reproducxing the RFC4360 text kinda makes that clear (at least to me)
> 
> Omitting it invites different handling and that would be not good

The relevant point from the thread is that the atomic-aggregate attribute is largely protocol noise.  It's a vestigial organ from the BGP-3 to BGP-4 transition, and a poorly specified one at that.  We shouldn't include its use in specifications, particularly where discussing aggregation.

The only place its discussion would be relevant is as part of *de-*aggregation of a prefix.

-- Jeff