[193943] in North American Network Operators' Group
Re: google ipv6 routes via cogent
daemon@ATHENA.MIT.EDU (Patrick W. Gilmore)
Fri Mar 3 09:42:15 2017
X-Original-To: nanog@nanog.org
From: "Patrick W. Gilmore" <patrick@ianai.net>
In-Reply-To: <58B95ADC.7080602@foobar.org>
Date: Fri, 3 Mar 2017 09:42:04 -0500
To: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
On Mar 3, 2017, at 7:00 AM, Nick Hilliard <nick@foobar.org> wrote:
>=20
> Niels Bakker wrote:
>> As I explained in the rest of my email that you conveniently didn't
>> quote, it's so that you can selectively import routes from all your
>> providers in situations where your router cannot handle a full table.
>=20
> it can also break horribly in situations where the provider is =
providing
> "transit" but doesn't provide full transit.
>=20
> OTOH, if you are single-homed, it is highly advisable to accept a
> default, the reason being that most transit providers provide bgp
> communities with "don't advertise to customers" semantics. So if =
you're
> single-homed and use a full dfz feed without default route, you will =
not
> have full connectivity to all the routes available from the transit
> provider.
If you are single-homed, there is no need for BGP at all. And injecting =
your ASN into the table is probably not terribly useful to everyone =
else=E2=80=99s FIB.
There are, of course, corner cases. But in general, single-homed people =
shouldn=E2=80=99t be using BGP.
--=20
TTFN,
patrick
