The rapid growth in the size and dynamics of the global routing table has been a long-standing problem. Several solutions have been proposed. One popular class of these solutions separates the Internet into two routing domains, one for the actual sources and sinks of packets, and one for transit through the "transit core" between them. Solutions of this class include a "mapping system" that bridges the two spaces. We present one such solution: an Architecture for Practical Transit core separation (APT). APT adheres to a "do no harm" design philosophy: maintain all desirable features of the current architecture without negatively affecting its security, reliability, or economics. Specifically, APT aims to make no changes to end-user sites, minimize the amount of new infrastructure required, align the cost of deployment with those who will benefit, and maintain the performance of the current network.
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