Abstract — We propose to add geographic location information into BGP routing updates to enable Geographically Informed Inter-Domain Routing (GIRO). GIRO departs from previous geographical addressing proposals in that it uses geographical information to assist policy-based routing instead of replacing the provider-based IP address allocations. We show that, within routing policy constraints, geographic information can help routers select routing paths with shortest geographic distance and significantly improve the performance of the global Internet routing system. We evaluate GIRO’s performance through simulations using a Rocketfuel-measured Internet topology. Our the results show that GIRO can reduce geographic distance for 70% of the existing BGP paths, and the reduction is more than 40 % for about 20 % of paths. I
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