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As the Internet booms in size and evolves toward a ubiquitous information infrastructure, its inter-domain routing mechanism is going to encounter predictable scalability problems in the future. This paper introduces a new scalable inter-domain routing protocol, AS-level Inter-domain Routing (AIR) which is tailored for the Internet that the authors can envision today. They design AIR at the routing granularity of the Autonomous System (AS) level and take advantages of the Multi Protocol Label Switch (MPLS) to facilitate the packet forwarding between ASes. Compared with the Border Gateway Protocol (BGP), AIR enhances the routing scalability of the next generation Internet while preserving the economic/administrative model of the inter-domain operations.
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