[163949] in North American Network Operators' Group
Re: /25's prefixes announced into global routing table?
daemon@ATHENA.MIT.EDU (Jakob Heitz)
Fri Jun 21 18:28:07 2013
From: Jakob Heitz <jakob.heitz@ericsson.com>
To: "nanog@nanog.org" <nanog@nanog.org>
Date: Fri, 21 Jun 2013 22:27:44 +0000
In-Reply-To: <mailman.6359.1371852012.91371.nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
> Date: Fri, 21 Jun 2013 16:14:07 -0400
> From: "Majdi S. Abbas" <msa@latt.net>
>=20
> On Fri, Jun 21, 2013 at 01:56:02PM -0600, Michael McConnell wrote:
>> As the IPv4 space get smaller and smaller, does anyone think we'll
>> see a time when /25's will be accepted for global BGP prefix
>> announcement. The current smallest size is a /24 and generally ok
>> for most people, but the crunch gets tighter, routers continue to
>> have more and more ram will it always be /24 the smallest size?
>=20
> RAM !=3D FIB.
>=20
> The forwarding hardware is generally going to be the limit, and
> that's going to be painful enough as we approach a half million
> prefixes.=20
>=20
> You couldn't even consider such a thing until after that pain
> point.
>=20
> --msa
There are techniques to fix that. For example, Simple Virtual Aggregation
http://tools.ietf.org/html/rfc6769
--=20
Jakob Heitz.
