[58523] in North American Network Operators' Group
Re: BGP Path Filtering
daemon@ATHENA.MIT.EDU (Sean Donelan)
Fri May 16 20:10:47 2003
Date: Fri, 16 May 2003 20:10:22 -0400 (EDT)
From: Sean Donelan <sean@donelan.com>
To: Leo Bicknell <bicknell@ufp.org>
Cc: nanog@merit.edu
In-Reply-To: <20030517000731.GA3857@ussenterprise.ufp.org>
Errors-To: owner-nanog-outgoing@merit.edu
On Fri, 16 May 2003, Leo Bicknell wrote:
> In a message written on Fri, May 16, 2003 at 08:00:00PM -0400, Sean Donelan wrote:
> > Large ISPS (more than 500 eBGP neighbors and 5000 prefixes) are going to
>
> MFN / AboveNet qualifies as a "large ISP" by your definition, yet:
>
> > sufficient). ANS was the only major commercial provider I knew which
> > explicitly configured BGP announcement filters for every network prefix
> > from every source. According to studies, about 70% of large ISPs
>
> We prefix-list filter all of our customers. We have from time to
> time made an exception due to route limits, or people limits, but
> we still exceed 99% of our customers are fully prefix-list filtered
> on all inbound announcements. It's not that hard.
I said *EVERY* network prefix from *EVERY* source. I didn't limit it to
just customers. ANS also filtered peers.
