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Persistent route oscillations in inter-domain routing

10 years 1 months ago
Persistent route oscillations in inter-domain routing
Hop-by-hop inter-domain routing protocols, such as BGP and IDRP, use independent route selection to realize domains' local policies. A domain chooses its routes based on path attributes present in a route. It is widely believed that these inter-domain routing protocols always converge. We show that there exist domain policies that cause BGP/IDRP to exhibit persistent oscillations. In these oscillations, each domain repeatedly chooses a sequence of routes to a destination. Complex oscillation patterns can occur even in very simple topologies. We analyze the conditions for persistent route oscillations in a simple class of interdomain topologies and policies. Using this analysis, we evaluate ways to prevent or avoid persistent oscillations in general topologies. We conclude that if a hop-by-hop inter-domain routing protocol allows unconstrained route selection at a domain, the protocol may be susceptible to route oscillations. Constraining route selection to a provably "safe&q...
Kannan Varadhan, Ramesh Govindan, Deborah Estrin
Added 17 Dec 2010
Updated 17 Dec 2010
Type Journal
Year 2000
Where CN
Authors Kannan Varadhan, Ramesh Govindan, Deborah Estrin
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