[151000] in North American Network Operators' Group
Re: filtering /48 is going to be necessary
daemon@ATHENA.MIT.EDU (Bernhard Schmidt)
Fri Mar 9 15:51:52 2012
Date: Fri, 09 Mar 2012 21:50:45 +0100
From: Bernhard Schmidt <berni@birkenwald.de>
To: Owen DeLong <owen@delong.com>
In-Reply-To: <BA7EEF1F-8F42-4AFA-AB2D-D8A820EC59B4@delong.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 09.03.2012 20:31, Owen DeLong wrote:
Hi,
> Let us not forget that there is also the issue of PA /48s being
> advertised (quasi-legitimately) for some end-user organizations that
> are multi-homed but choose not to get PI space. It is not uncommon to
> obtain a PA /48 from provider A and also advertise it from Provider
> B.
While I agree it's not uncommon, I'm not a big fan of this setup. Also,
provider A should still have his aggregate announced, which would allow
strictly filtering ISPs to reach the destination anyway.
Announcing /48s from a PA block without the covering aggregate calls for
trouble.
Bernhard
