BGP Extensions to Enable BGP FlowSpec based IFIT

Border Gateway Protocol (BGP) Flow Specification (FlowSpec) is an extension to BGP that supports the dissemination of traffic flow specifications and resulting actions to be taken on packets in a specified flow. In-situ Flow Information Telemetry (IFIT) denotes a family of flow-oriented on-path telemetry techniques, which can provide high-precision flow insight and real-time network issue notification. This document defines BGP extensions to distribute BGP FlowSpec based traffic filtering carrying IFIT information. So IFIT behavior can be applied to the specified flow automatically.