This document discusses using BGP Flowspec for DDoS mitigation. It provides an overview of legacy DDoS mitigation methods, describes how BGP Flowspec works by distributing flow specifications using BGP, and gives examples of how it can be used for inter-domain and intra-domain DDoS mitigation as well as with a scrubbing center. It also discusses vendor support, advantages over previous methods, potential issues, real world deployments, and the current state and future of BGP Flowspec.