[148139] in North American Network Operators' Group

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Re: anycast load balancing issue

daemon@ATHENA.MIT.EDU (Cameron Byrne)
Wed Jan 4 09:57:52 2012

In-Reply-To: <20120104125154.GU7491@besserwisser.org>
Date: Wed, 4 Jan 2012 06:56:58 -0800
From: Cameron Byrne <cb.list6@gmail.com>
To: =?ISO-8859-1?Q?M=E5ns_Nilsson?= <mansaxel@besserwisser.org>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org

On Jan 4, 2012 4:52 AM, "M=E5ns Nilsson" <mansaxel@besserwisser.org> wrote:
>
> Subject: anycast load balancing issue Date: Wed, Jan 04, 2012 at
01:02:55PM +0100 Quoting M=E5ns Nilsson (mansaxel@besserwisser.org):
>
> > Trouble is, we find that (untweaked) cost and metric are such that all
> > nodes are equal.
>
> s/all nodes/all nodes in my pathetically small test case/
>
> Was no issue. I just was unlucky in selecting test cases. Sorry.
>
>
> --
> M=E5ns Nilsson     primary/secondary/besserwisser/machina
> MN-1334-RIPE                             +46 705 989668
> Do you have exactly what I want in a plaid poindexter bar bat??
>
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I use:

Anycast =3D server loop back
Protocol to server =3D bgp / bfd

This allows for ecmp horizontal scaling for n number of dns servers (where
n is less than Max ecmp paths)

You may need to turn the bgp ecmp multipath knob.

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