Techniques are described herein to establish hierarchical Segment Routing (SR) policies with built-in resiliency. These techniques increase the scalability of the SR Path Computation Element (PCE) and SR network. Specifically, once such policies are installed by the SR PCE, the SR PCE does not have to take any action in the event of failure. This is an improvement over current approaches, which employ the SR head-end node as a single point of failure.
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Filsfils, Clarence; Ali, Zafar; Agrawal, Swadesh; Clad, Francois; Liste, Jose; and Chaloupka, Jiri, "SEGMENT ROUTING POLICIES WITH BUILT-IN RESILIENCY", Technical Disclosure Commons, (January 02, 2020)