When the Cure is Worse than the Disease: the Impact of Graceful IGP Operations on BGP

Fri, 11/23/2012 - 03:40 by Laurent Vanbever


Network upgrades, performance optimizations and
traffic engineering activities often force network operators to
adapt their IGP configuration. Recently, several techniques have
been proposed to change an IGP configuration (e.g., link weights)
in a disruption-free manner. Unfortunately, none of these techniques considers the impact of IGP changes on BGP correctness.
In this paper, we show that known reconfiguration techniques
can trigger various kinds of BGP anomalies. First, we illustrate
the relevance of the problem by performing simulations on a
Tier-1 network. Our simulations highlight that even a few link
weight changes can produce long-lasting BGP anomalies affecting
a significant part of the BGP routing table. Then, we study the
problem of finding a reconfiguration ordering which maintains
both IGP and BGP correctness. Unfortunately, we show examples
in which such an ordering does not exist. Furthermore, we prove
that deciding if such an ordering exists is NP-hard. Finally, we
provide sufficient conditions and configuration guidelines that
enable graceful operations for both IGP and BGP.

Laurent Vanbever, Stefano Vissicchio, Luca Cittadini and Olivier Bonaventure
In 32nd IEEE International Conference on Computer Communications (IEEE INFOCOM 2013), April 2013.
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