Tsinghua University Zhongguancun Laboratory Zhongguancun Laboratory Tsinghua University The Route Path Authorizations (RPA) is an RPKI object that attests to the routing paths description which an Autonomous System (AS) would obey in Border Gateway Protocol (BGP) route propagation. This document specifies an RPA-based AS Path Verification methodology to mitigate, even solve, AS Path forgery and route leaks. This document also explains the various BGP security threats that RPA can help address and provides operational considerations associated with RPA deployment.