The amount of redundant paths among ASes has dramatically increased throughout the Internet. Unfortunately, the unipath nature of BGP constrains border routers to course traffic across a single path at a time. Although, multipath inter- domain routing is able to provide richer routing configurations, the lack of incentives to replace BGP as inter-domain routing protocol implies that multipath solutions must be backwards compatible with BGP. Existing multipath solutions are limited by those requirements or their deployment requires coordination among ASes that are likely to have different stakes. This paper presents ASSEMBLER, the first BGP-compatible multipath pro- tocol that can be progressively deployed by each AS individually and provide border routers with reachability information to forward traffic through multiple paths simultaneously.

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