[184875] in North American Network Operators' Group
Re: IGP choice
daemon@ATHENA.MIT.EDU (=?utf-8?B?TcOlbnM=?= Nilsson)
Sat Oct 24 18:40:57 2015
X-Original-To: nanog@nanog.org
Date: Sun, 25 Oct 2015 00:40:49 +0200
From: =?utf-8?B?TcOlbnM=?= Nilsson <mansaxel@besserwisser.org>
To: "marcel.duregards@yahoo.fr" <marcel.duregards@yahoo.fr>
In-Reply-To: <5629155D.3090206@yahoo.fr>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
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Subject: IGP choice Date: Thu, Oct 22, 2015 at 06:57:01PM +0200 Quoting mar=
cel.duregards@yahoo.fr (marcel.duregards@yahoo.fr):
> Hi everyone,
>=20
> Anybody from Yahoo to share experience on IGP choice ?
> IS-IS vs OSPF, why did you switch from one to the other, for what reason ?
> Same question could apply to other ISP, I'd like to heard some internatio=
nal
> ISP/carriers design choice, please.
We use IS-IS in our network mostly because I was around when a bunch
of NREN switched to IS-IS some 15 years ago, and it stuck. It is, as
has been noted, mostly a matter of preference, but there is one or two
technical arguments for IS-IS that tip the scales for me;
- One IGP for both v6 and v4. Mostly interesting if you are running a
lot of traffic outside VRFen. But nevertheless a good thing to keep v6
and v4 in sync.
- No leakage. Not many external peers speak IS-IS on their peering
interfaces, so chances are that even if I do, nothing will fall over.
This of course also applies to access interfaces, where my hosts won't=20
even have an OSI stack and thus won't try to process the frames.=20
The argument for OSPF mostly is that there are several FOSS OSPF d=C3=A6mons
for Posixly machines, making it a good choice for things like anycast
name servers or similar. We do run it for precisely this setup.=20
Do read the presentation Vijay Gill made and that people keep pointing to.=
=20
It is a very good account of how to purge OSPF in favour of IS-IS.=20
--=20
M=C3=A5ns Nilsson primary/secondary/besserwisser/machina
MN-1334-RIPE +46 705 989668
I'm also pre-POURED pre-MEDITATED and pre-RAPHAELITE!!
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