BGP Experiment

Italo Cunha cunha at
Tue Jan 8 16:41:07 UTC 2019


We've performed the first announcement in this experiment yesterday,
and, despite the announcement being compliant with BGP standards, FRR
routers reset their sessions upon receiving it.  Upon notice of the
problem, we halted the experiments.  The FRR developers confirmed that
this issue is specific to an unintended consequence of how FRR handles
the attribute 0xFF (reserved for development) we used.  The FRR devs
already merged a fix and notified users.

We plan to resume the experiments January 16th (next Wednesday), and
have updated the experiment schedule [A] accordingly.  As always, we
welcome your feedback.


On Tue, Dec 18, 2018 at 10:05 AM Italo Cunha <cunha at> wrote:
> We would like to inform you of an experiment to evaluate alternatives
> for speeding up adoption of BGP route origin validation (research
> paper with details [A]).
> Our plan is to announce prefix with a valid
> standards-compliant unassigned BGP attribute from routers operated by
> the PEERING testbed [B, C]. The attribute will have flags 0xe0
> (optional transitive [rfc4271, S4.3]), type 0xff (reserved for
> development), and size 0x20 (256bits).
> Our collaborators recently ran an equivalent experiment with no
> complaints or known issues [A], and so we do not anticipate any
> arising. Back in 2010, an experiment using unassigned attributes by
> RIPE and Duke University caused disruption in Internet routing due to
> a bug in Cisco routers [D, CVE-2010-3035]. Since then, this and other
> similar bugs have been patched [e.g., CVE-2013-6051], and new BGP
> attributes have been assigned (BGPsec-path) and adopted (large
> communities). We have successfully tested propagation of the
> announcements on Cisco IOS-based routers running versions 12.2(33)SRA
> and 15.3(1)S, Quagga and 1.1.1, as well as BIRD 1.4.5 and
> 1.6.3.
> We plan to announce from 8 PEERING locations for a
> predefined period of 15 minutes starting 14:30 GMT, from Monday to
> Thursday, between the 7th and 22nd of January, 2019 (full schedule and
> locations [E]). We will stop the experiment immediately in case any
> issues arise.
> Although we do not expect the experiment to cause disruption, we
> welcome feedback on its safety and especially on how to make it safer.
> We can be reached at disco-experiment at
> Amir Herzberg, University of Connecticut
> Ethan Katz-Bassett, Columbia University
> Haya Shulman, Fraunhofer SIT
> Ítalo Cunha, Universidade Federal de Minas Gerais
> Michael Schapira, Hebrew University of Jerusalem
> Tomas Hlavacek, Fraunhofer SIT
> Yossi Gilad, MIT
> [A]
> [B]
> [C]
> [D]
> [E]

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