Cymru Bogon AS path change

Nick Hilliard nick at
Mon Sep 16 17:10:14 UTC 2013

On 16/09/2013 18:01, Ben Bartsch wrote:
> We certainly did when we starting advertising all the bogons to our ISP
> peers.  Probably should have had an inbound AS path filter on that cymru
> peering...

better still, tag them all with a BGP community to make a note that they
are bogons from Cymru (i.e. immediately identifiable throughout your
network), and also tag them with no-export to ensure that they cannot
propagate outside your asn.

as-path filters are inefficient from several points of view.


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