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Cymru Bogon AS path change

Subject: Cymru Bogon AS path change
From: nick at foobar.org (Nick Hilliard)
Date: Mon, 16 Sep 2013 18:10:14 +0100
In-reply-to: <CAOvEG7NTrjxB_FFeEthKE8mCP1v8g1FBiq42eew9UOsh+NrVfw@mail.gmail.com>
References: <CAOvEG7NTrjxB_FFeEthKE8mCP1v8g1FBiq42eew9UOsh+NrVfw@mail.gmail.com>

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.

Nick

References:
- Cymru Bogon AS path change
  - From: uwcableguy at gmail.com (Ben Bartsch)

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