AIDR: Aggregation of BGP routing table with AS path stretch

As Internet growth, more and more prefix fragments are announced into the global routing system due to operational reasons of inconsecutive address allocation, multihoming, and traffic engineering. The BGP routing table size in Default Free Zone (DFZ) fast growth will consume more memory space and computational capacity. It has been known that Internet will face with routing scalability issue, especially in the large address space (e.g., IPv6) deployment. In this paper, we propose an innovation to BGP, named Aggregation-aware Inter-Domain Routing (AIDR). It will take the prefix aggregation into account to make tradeoff in the best route selection. We evaluate the effect of AIDR on global routing system using the BGP traces from RouteViews and RIPE. It shows that, averagely, AIDR-based aggregation can reduce to roughly 15%∼35% of original routing table size under the 2.0 AS path stretch constraint, and to 25%∼40% with no AS path stretch.