tim https://www.wpgdadatong.com/blog/detail/40799 https://www.cisco.com/c/dam/global/zh_cn/solutions/service-provider/segment-routing/pdf/segment_routing_introduction_cn.pdf https://www.cisco.com/c/zh_tw/support/docs/multiprotocol-label-switching-mpls/mpls/215215-segment-routing-overview-and-migration-g.html https://www.sdnlab.com/24475.html