On Internet Availability: Where Does Path Choice Matter?
نویسندگان
چکیده
Today’s Internet availability is low, despite the efforts of organizations to improve failure resilience through multi-homing. In this paper, we analyze where and how much exposure to topology is needed to best improve availability without sacrificing scalability. Through this analysis, we find that exposing choice of the first and last AS hops between multi-homed AS pairs can almost always provide a maximum number of AS disjoint paths through the network, whereas the paths exposed under multi-homing tend to share the same inbound route to multi-homed destinations. We qualify our topological analysis with an active measurement study showing that exposing choice of the first and last AS hops can provide availability approaching the optimal availability possible, suggesting that high availability can be obtained without sacrificing scalability.
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