A Routing Optimization Algorithm for BGP Egress Selection
BGP optimal egress selection is one of a recent trend in routing research. Current hot-potato routing has the problem of routing instability. This paper provides a new algorithm named BGP-RO-ES to minimize hot-potato disruptions while satisfying multiple constraints of different metrics, such as traffic engineering, the cost of traffic across the network and the cost of maintaining lightweight tunnels. The algorithm can be adaptive to different link failures and can be implemented in current BGP routers with a little change. Simulation results show that the control stability of BGP-RO-ES can be very close to that of TIE algorithm and that of RTF_TIE algorithm spending only half of the cost of maintaining lightweight tunnels.
KeywordsBGP hot-potato routing interdomain traffic engineering
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