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The Border Gateway Protocol (BGP) works by frequently exchanging updates that disseminate reachability information about IP prefixes (i.e., IP address blocks) between Autonomous Systems (ASes) on the Internet. The ideal operation of BGP relies on three major behavioral assumptions (BAs): Information contained in the update is legal and correct, a route to a pre x is stable, and the route adheres to the valley free routing policy. The current operation of BGP implicitly trusts all ASes to adhere to these assumptions. However, several documented violation of these assumptions attest to the fact that such an assumption of trust is perilous.
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