| Over the past decade, the complexity of the Internet's routing infrastructure has increased dramatically. This complexity and the problems it causes stem not just from various new demands made of the routing infrastructure, but also from fundamental limitations in the ability of today's distributed infrastructure to scalably cope with new requirements.The limitations in today's routing system arise in large part from the fully distributed path-selection computation that the IP routers in an autonomous system (AS) must perform. We put our focus on the Internal Border Gateway Protocol(IBGP). The routers in an Autonomous System (AS) must distribute the information they learn about how to reach external destinations. Unfortunately, today's Internal Border Gateway Protocol architectures have serious problems: a full mesh IBGP configuration does not scale to large networks and route reflection can introduce problems such as protocol oscillations and persistent loops.To overcome this weakness, interdomain routing should be separated from today's IP routers, which should simply forward packets (for the most part). Instead, a separate route conputing and control platform should select routes on behalf of the IP routers in each AS and exchange reachability information with other domains.As a solution, we present a BGP Route Server Platform (RSP) architecture . RSP should collect information about external destinations and internal topology and select the BGP routes for each router in an AS. RSP is a logically centralized platform, separate from the IP forwarding plane, that performs route selection on behalf of routers and communicates selected routes to the routers using the unmodified IBGP protocol. RSP provides scalability without sacrificing correctness. In this paper, we present the design and implementation of an RSP prototype . At last, according to the current requirement and practical ability,we demonstrate the consistency and validity of RSP through some tests. |
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