[163960] in North American Network Operators' Group
Re: /25's prefixes announced into global routing table?
daemon@ATHENA.MIT.EDU (Masataka Ohta)
Fri Jun 21 21:13:30 2013
Date: Sat, 22 Jun 2013 10:11:55 +0900
From: Masataka Ohta <mohta@necom830.hpcl.titech.ac.jp>
To: nanog@nanog.org
In-Reply-To: <20130621201407.GA4370@puck.nether.net>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Majdi S. Abbas wrote:
> 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?
>
> RAM != FIB.
For /24, cheap 16M entry SRAM == FIB
> 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.
True. And that's why we must avoid IPv6.
Masataka Ohta
