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Re: [Idr] WG LC for draft-ietf-bgp-route-oscillation-stop (4/6 to 4/20)

Daniel Walton <dwalton@cumulusnetworks.com> Tue, 21 April 2015 14:42 UTC

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Date: Tue, 21 Apr 2015 10:42:21 -0400
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From: Daniel Walton <dwalton@cumulusnetworks.com>
To: Susan Hares <shares@ndzh.com>
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Cc: dbrungard@att.com, idr wg <idr@ietf.org>
Subject: Re: [Idr] WG LC for draft-ietf-bgp-route-oscillation-stop (4/6 to 4/20)
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On Mon, Apr 20, 2015 at 12:59 AM, Susan Hares <shares@ndzh.com> wrote:

> Daniel:
>
>
>
> Do you see any current changes in the churn level?  Have you examined the
> churn inside of a datacenter?
>

Most customers I worked with that hit MED churn were hitting the Type I
variety (details in rfc3345) and solved it by increasing the IGP metrics
between their clusters or confed sub-ASes.  UUNET was the big exception,
they used confederations and were hitting Type II churn but it wasn't
painful enough for them to make changes to stop it as the changes needed
were fairly dramatic. UUNET's churn was one of the big drivers for doing
add-path.

I haven't run into MED churn in the data center yet.  Many of our data
center customers use BGP without an IGP which eliminates one of the
variables needed to cause the churn.

Daniel

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