[180378] in North American Network Operators' Group

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Re: BGP Multihoming 2 providers full or partial?

daemon@ATHENA.MIT.EDU (William Herrin)
Mon Jun 1 17:46:51 2015

X-Original-To: nanog@nanog.org
X-Really-To: <nanog@nanog.org>
In-Reply-To: <CAPkb-7Cq-UJdB8G-f8vdngbe5BYqgY+M6ZH1fGA7rLsvyF9pKQ@mail.gmail.com>
From: William Herrin <bill@herrin.us>
Date: Mon, 1 Jun 2015 17:46:22 -0400
To: Baldur Norddahl <baldur.norddahl@gmail.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org

On Mon, Jun 1, 2015 at 5:13 PM, Baldur Norddahl
<baldur.norddahl@gmail.com> wrote:
> This is only a problem if you use so called tier 1 transit providers.
>
> The smaller fish in the pond have multiple transits themselves and will
> there by always have an alternative route available.

Hi Baldur,

Cogent is not a tier 1 (not a "transit-free") provider last I heard.
Maybe that's changed, but they weren't back when they had the
week-long peering dispute with Sprint. Their business plan included
preventing their routes from reaching Sprint via paid transit. If you
were a customer of either carrier that week and you weren't multihomed
with full routes, you were not a happy camper.

"Always" is such a strong. Yes, you're at higher risk if all your
upstreams are "transit-free" but using only backbone providers who
have paid upstream transit in their mix is no panacea.

Regards,
Bill Herrin



-- 
William Herrin ................ herrin@dirtside.com  bill@herrin.us
Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/>

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