Re: [Idr] [GROW] Measurements on Regular, Extended, and Large Communities

Nick Hilliard <nick@foobar.org> Fri, 24 April 2020 13:50 UTC

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To: "Sriram, Kotikalapudi (Fed)" <kotikalapudi.sriram=40nist.gov@dmarc.ietf.org>
Cc: GROW WG <grow@ietf.org>, "idr@ietf.org" <idr@ietf.org>, "Hannachi, Lilia (IntlAssoc)" <lilia.hannachi@nist.gov>, "draft-heitz-idr-wklc@ietf.org" <draft-heitz-idr-wklc@ietf.org>
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From: Nick Hilliard <nick@foobar.org>
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Date: Fri, 24 Apr 2020 14:50:25 +0100
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Subject: Re: [Idr] [GROW] Measurements on Regular, Extended, and Large Communities
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Sriram, Kotikalapudi (Fed) wrote on 24/04/2020 14:14:
> ** Question: Any insights why we don't see any ECs at all? **

possibilities:

- there are many types of EC and router config grammar is implemented 
inconsistently across different platforms, and there's no guarantee that 
the grammar is capable of expressing anything other than the commoner types

- they can't handle asn32:asn32, so there's no compelling reason to 
prefer them over rfc1997 communities.

- the more common EC types already have specific meanings, e.g. RT/SOO/etc

I've never seen them in the wild used for generic purposes.  It's always 
rfc1997, or more recently LC.

Nick