[172756] in North American Network Operators' Group
Re: Best practice for BGP session/ full routes for customer
daemon@ATHENA.MIT.EDU (Jason Lixfeld)
Mon Jul 7 14:48:04 2014
X-Original-To: nanog@nanog.org
From: Jason Lixfeld <jason@lixfeld.ca>
In-Reply-To: <CAJ0+aXbNAj63WFjePB4DaK3OX8RkVAgnuFwdUbEw98A8jkwPKQ@mail.gmail.com>
Date: Mon, 7 Jul 2014 14:46:05 -0400
To: Anurag Bhatia <me@anuragbhatia.com>
Cc: NANOG <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
1. You already know that multihop is very ugly. If it's for a one-off, =
it's probably fine. But building a product around multi-hop wouldn't be =
my first choice.
2. Most of the router/switch vendors that can support a full table are =
pretty expensive, per port. Your best bet here might be to look into =
some way of transparently dragging customer traffic from the PE to the =
BGP speaker, which leads me to:
3. If your network is MPLS enabled, you can do a routed pseudowire from =
a BGP speaking router with a full table to the access router (PE). =
Other tunnelling technologies can probably do the same thing; GRE, =
L2TPv3 and also a plain'ol VLAN can do it too, depending on your network =
topology. Do some sort of OAM over top of either of those (if your =
platform supports it) and it looks just like a wire to the end customer.
On Jul 7, 2014, at 2:33 PM, Anurag Bhatia <me@anuragbhatia.com> wrote:
> Hello everyone!
>=20
>=20
> I have quick question on how you provide full BGP table to downstream
> customers?
>=20
>=20
> Most of large networks have few border routers ("Internet gateways") =
which
> get full table feed and then they have "Access routers" on which =
customers
> are terminated. Now I don't think it makes sense to push full routing =
table
> on the "access routers" and simply their default points to border =
routers.
>=20
>=20
> In this scenario what is best practice for giving full table to =
downstream?
>=20
>=20
> 1. Having multi-hop BGP session with a loopback on "border router" =
for
> injecting full table in customer router and another BGP session with =
access
> router for receiving routes? (messy!)
>=20
>=20
> 2. Injecting full table in just all access routers so that it can be
> provided whenever needed?
>=20
> 3. Any other?
>=20
>=20
>=20
>=20
> Thanks in advance!
>=20
> --=20
>=20
>=20
> Anurag Bhatia
> anuragbhatia.com
>=20
> Linkedin <http://in.linkedin.com/in/anuragbhatia21> | Twitter
> <https://twitter.com/anurag_bhatia>
> Skype: anuragbhatia.com
>=20
> PGP Key Fingerprint: 3115 677D 2E94 B696 651B 870C C06D D524 245E 58E2
