Hi, I have reviewed this document as part of the security directorate's ongoing effort to review all IETF documents being processed by the IESG. These comments were written primarily for the benefit of the security area directors. Document editors and WG chairs should treat these comments just like any other last call comments This document identifies and describes the requirements for a set of use cases related to network resiliency on Segment Routing (SPRING) networks. This informational document introduces the candidate solutions/use cases which could be applied to enhance the network resiliency on SPRING networks when failures occurs. I think this work does not bring any additional security issue. The document is READY for publication. Thanks, Dacheng