[168194] in North American Network Operators' Group
Re: best practice for advertising peering fabric routes
daemon@ATHENA.MIT.EDU (Dobbins, Roland)
Wed Jan 15 09:49:32 2014
From: "Dobbins, Roland" <rdobbins@arbor.net>
To: NANOG list <nanog@nanog.org>
Date: Wed, 15 Jan 2014 14:49:10 +0000
In-Reply-To: <818A55E6-40E6-4106-B012-8F70CB16676E@ufp.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On Jan 15, 2014, at 9:18 PM, Leo Bicknell <bicknell@ufp.org> wrote:
> However, a good engineer would know there are drawbacks to =
next-hop-self, in particular it slows convergence in a number of =
situations. There are networks where fast convergence is more important =
than route scaling, and thus the traditional design of BGP next-hops =
being edge interfaces, and edge interfaces in the IGP performs better.
A good engineer also knows that there are huge drawbacks to having a =
peer's network infrastructure DDoSed, routes flapping, core bandwidth =
consumed by tens and hundreds of gb/sec of attack traffic, et. al., too.
;>
> By attempting to force IX participants to not put the route in IGP, =
those IX participants are collectively deciding on a slower converging =
network for everyone. I don't like a world where connecting to an =
exchange point forces a particular network design on participants.
Concur. But that's the world we live in, unfortunately.
It's just another example of the huge, concentric nature of the =
collateral damage arising from DDoS attacks, both from the attacks =
themselves, and from the compromises folks have to make in order to =
increase resilience against such attacks.
> That's some circular reasoning.
Not really. What I'm saying is that since PMTU-D is already broken on =
so many endpoint networks - i.e., where traffic originates and where it =
terminates - that any issues arising from PMTU-D irregularities in IXP =
networks are trivial by comparison.
-----------------------------------------------------------------------
Roland Dobbins <rdobbins@arbor.net> // <http://www.arbornetworks.com>
Luck is the residue of opportunity and design.
-- John Milton
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