NSDI '05 Abstract
Finding a Needle in a Haystack: Pinpointing Significant BGP Routing Changes in an IP Network
Jian Wu and Zhuoqing Morley Mao, University of Michigan; Jennifer
Rexford, Princeton University; Jia Wang, AT&T LabsResearch
The performance of a backbone network is vulnerable to interdomain routing changes that affect how traffic travels to
destinations in other Autonomous Systems (ASes). Despite having poor
visibility into these routing changes, operators often need to react
quickly by tuning the network configuration to alleviate congestion or
by notifying other ASes about serious reachability problems.
Fortunately, operators can improve their visibility by monitoring the
Border Gateway Protocol (BGP) decisions of the routers at the
periphery of their AS. However, the volume of measurement data is
very large and extracting the important information is
challenging. In this paper, we present the design and evaluation of
an online system that converts millions of BGP update messages a day
into a few dozen actionable reports about significant routing
disruptions. We apply our tool to two months of BGP and traffic data
collected from a Tier-1 ISP backbone and discover several network
problems previously unknown to the operators.
Validation using other data sources confirms the accuracy of our
algorithms and the tool's additional value in detecting routing disruptions.
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