[164038] in North American Network Operators' Group
Re: /25's prefixes announced into global routing table?
daemon@ATHENA.MIT.EDU (Andra Lutu)
Mon Jun 24 04:07:33 2013
Date: Mon, 24 Jun 2013 10:07:01 +0200
From: Andra Lutu <andra.lutu@imdea.org>
To: Michael McConnell <michael@winkstreaming.com>
In-Reply-To: <mailman.6359.1371852012.91371.nanog@nanog.org>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Hi,
From public routing data we can see a total of 2,419 /25s prefixes
announced from at least one of the monitors active in RIPE RIS and
RouteViews.
None of the /25s are actually advertised by all these monitors i.e. the
/25s reach some but not all the ASes which take part in these projects.
The actual distribution of how many unique routing tables sampled
contain the /25s is the following:
http://visibility.it.uc3m.es/len25_distro.html (out of the approx. 140
collectors that have a "full" routing table).
The top 5 ASes that are originating the most /25s are:
AS 11427: 462 /25s
AS 4766: 273 /25s
AS 45400: 109 /25s
AS 14065: 82 /25s
AS 3549: 57 /25s
If you are interested in limited visibility prefixes, i.e., prefixes
that are distributed to some but not all the "full" routing tables at
the interdomain level, you can find more at
http://visibility.it.uc3m.es/ and
https://labs.ripe.net/Members/andra_lutu/the-bgp-visibility-scanner
Best regards,
Andra
On 06/22/2013 12:00 AM, nanog-request@nanog.org wrote:
> Date: Fri, 21 Jun 2013 13:56:02 -0600
> From: Michael McConnell<michael@winkstreaming.com>
> To: North American Network Operators Group<nanog@nanog.org>
> Subject: /25's prefixes announced into global routing table?
>
> Hello all,
>
> 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?
>
> Cheers,
> Mike
