filtering /48 is going to be necessary

Fri Mar 9 20:50:45 UTC 2012

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