[43267] in North American Network Operators' Group
Re: Verio Peering Question
daemon@ATHENA.MIT.EDU (Jeff Mcadams)
Wed Oct 3 08:39:32 2001
Date: Wed, 3 Oct 2001 08:38:50 -0400
From: Jeff Mcadams <jeffm@iglou.com>
To: Iljitsch van Beijnum <iljitsch@muada.com>
Cc: nanog@merit.edu
Message-ID: <20011003083850.A19049@iglou.com>
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In-Reply-To: <20011003140042.W14463-100000@sequoia.muada.com>; from iljitsch@muada.com on Wed, Oct 03, 2001 at 02:22:25PM +0200
Errors-To: owner-nanog-outgoing@merit.edu
Also sprach Iljitsch van Beijnum
>It would be an interesting project to make an algorithm that takes a
>BGP table, and creates the shortest possible FIB that has traffic being
>forwarded in accordance with this BGP table. For dual homed networks,
>you should always be able to drop more than half the routes and install
>a default instead.
This isn't exactly true. Keep in mind that with a full BGP table and
default-less, if you send traffic to a bogus IP address you would get a
Host Unreachable from your router, drop half the routes and put a
default in, and that traffic follows the default and at least makes it
to the next hop before getting a host unreachable.
This probably isn't a major deal, about the only real operational impact
is that your link that the default points to gets a bit more traffic on
it...whether it would be measurable is doubtful even...but this doesn't
exactly fit the constraints of the project you described as the
forwarding wouldn't be in accordance with the original BGP table.
</nit>
--
Jeff McAdams Email: jeffm@iglou.com
Head Network Administrator Voice: (502) 966-3848
IgLou Internet Services (800) 436-4456
