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Re: Persistent loops when mixing rtgwg-enterprise-pa-multihoming and rtgwg-dst-src-routing

Fred Baker <fredbaker.ietf@gmail.com> Sat, 29 July 2017 23:31 UTC

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Subject: Re: Persistent loops when mixing rtgwg-enterprise-pa-multihoming and rtgwg-dst-src-routing
From: Fred Baker <fredbaker.ietf@gmail.com>
In-Reply-To: <1DA4E10A-A73E-4B1D-B527-6825EA47AEFF@irif.fr>
Date: Sat, 29 Jul 2017 16:30:59 -0700
Cc: "Acee Lindem (acee)" <acee@cisco.com>, Anton Smirnov <as@cisco.com>, "rtgwg@ietf.org" <rtgwg@ietf.org>
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References: <20170719172913.GU773745@eidolon> <D59D5469.BA187%acee@cisco.com> <BFA9B79E-65F1-4679-BBED-A1FF80CC2050@irif.fr> <D59E78D6.BA292%acee@cisco.com> <E2F46315-BB0F-4463-B7D1-11E0965E92B8@irif.fr> <670146D0-A26A-4AA5-AC6C-253B81271C12@gmail.com> <1DA4E10A-A73E-4B1D-B527-6825EA47AEFF@irif.fr>
To: Matthieu Boutier <boutier@irif.fr>
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> On Jul 29, 2017, at 1:46 AM, Matthieu Boutier <boutier@irif.fr> wrote:
> 
>> Actually, I don't. I can produce cases in which source first gives the wrong route, and in which destination first gives the wrong route.
> 
> Interesting! (but I'm lost with the example below)
> 
>> The only way I see to make doing either one first *always* gives the right result is if a small set of routes is duplicated.
> 
> Did you mean: it any cases, the administrator himself will have to
> duplicate routes to achieve its goals?

If I had meant that I would have said it. I think the set of such FIB routes would be detected and programmed by the software that writes the FIB.

Let me work through the example for the rest of your email.

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