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Re: [v6ops] [GROW] Deaggregation by large organizations

"Alvaro Retana (aretana)" <aretana@cisco.com> Thu, 16 October 2014 13:03 UTC

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From: "Alvaro Retana (aretana)" <aretana@cisco.com>
To: Christopher Morrow <christopher.morrow@gmail.com>, Iljitsch van Beijnum <iljitsch@muada.com>
Thread-Topic: [GROW] Deaggregation by large organizations
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Date: Thu, 16 Oct 2014 13:03:08 +0000
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Cc: IPv6 Operations <v6ops@ietf.org>, "grow@ietf.org grow@ietf.org" <grow@ietf.org>
Subject: Re: [v6ops] [GROW] Deaggregation by large organizations
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On 10/15/14, 6:04 PM, "Christopher Morrow" <christopher.morrow@gmail.com>
wrote:

>>
>>- A set of communities that indicate whether a prefix is a more specific
>>that is covered by an aggregate and/or is safe to filter without loss of
>>connectivity.
>>
>
>so, add communities to global routes, because people don't strip these
>in ingress as a matter of best practice? (if you don't you REALLY
>should consider it, i think)

Right..  Even if we could make the communities not be stripped (not
proposing that), the originator would still not know the policy between
any two ASNs ‹ not even the receive policy of its direct neighbor!   So
the originator still couldn¹t guarantee that the route is in fact covered.

The only way to determine coverage and no connectivity loss is on the
receive side.  There you can look at the incoming routes and determine how
the routes overlap and mark them appropriately according to local policy.

http://tools.ietf.org/html/draft-white-grow-overlapping-routes

Alvaro.

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