BGP Path Filtering
Sean Donelan
sean at donelan.com
Sat May 17 00:10:22 UTC 2003
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.
More information about the NANOG
mailing list