Maybe I read your question wrong, but null-routing things at your border is often not very useful if the traffic is flooding your transit links. Most transits publish their community lists - you just need to tag the prefix you want to blackhole with the right community. See example from HE: http://www.he.net/adm/blackhole.html <http://www.he.net/adm/blackhole.html>-Jack Carrozzo On Tue, Feb 22, 2011 at 4:42 PM, David Hubbard < dhubbard@dino.hostasaurus.com> wrote:
I was wondering if anyone has a howto floating around on the step by step setup of having an internal bgp peer for sending quick updates to border routers to null route sources of undesirable traffic? I've seen it discussed on nanog from time to time, typically suggesting using Zebra, but could not search up a link on a step by step.
Thanks,
David