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Abstract: Hybrid Link-State Path-Vector Protocol, or HLP, is an inter-domain routing protocol designed as a replacement for the current Border Gateway Protocol (BGP). Using a combination of link-state and path vector routing, it provides greater scalability, better fault isolation and better convergence. The core of HLP is the inclusion of the economic and political structure of the Internet into inter-domain routing. That is, BGP currently considers each AS as a node in a general graph without any specific structure (using explicit policies to constrain routing), whereas HLP assumes that the Internet structure is basically hierarchical with the provider autonomous systems (ASes) being the roots of customer ASes. HLP explicitly includes the relationship between 2 neighboring ASes in its protocol. This will reduce misconfigurations which should hopefully reduce the occurrence of routing abnormalities. However, the tradeoff is some amount of inflexibility in the routing algorithm. This is resolved using exceptions that are expected to be rare and therefore acceptable.
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