Cisco Systems Cisco Systems Juniper Networks Bell Canada. Google, Inc. Google, Inc. Google, Inc. Deutsche Telekom Steinberg Consulting Orange Business Services Orange Business Services Microsoft Cisco Systems Cisco Systems Cisco Systems Cisco Systems Cisco Systems Segment Routing (SR) allows a headend node to steer a packet flow along any path. Intermediate per-flow states are eliminated thanks to source routing. The headend node steers a flow into an SR Policy. The header of a packet steered in an SR Policy is augmented with the ordered list of segments associated with that SR Policy. This document details the concepts of SR Policy and steering into an SR Policy.