An introduction to the Segment Routing Traffic Engineering (SR-TE) technology. See how SR-TE provides a simple, automated, and scalable architecture to engineer traffic flows in a network. Further, see how the IOS XR based SR Path Computation Element (SR PCE) fits into this architecture. SR PCE provides scalable multi-domain SR-optimized path computation capabilities, including multi-domain path disjointness. SR-TE provides lots of functionality. It was designed with lead operators, along their use-cases.