@misc{rfc9545,
    series =    {Request for Comments},
    number =    9545,
    howpublished =  {RFC 9545},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC9545},
    url =       {https://www.rfc-editor.org/info/rfc9545},
    author =    {Weiqiang Cheng and Han Li and Cheng Li and Rakesh Gandhi and Royi Zigler},
    title =     {{Path Segment Identifier in MPLS-Based Segment Routing Networks}},
    pagetotal = 11,
    year =      2024,
    month =     feb,
    abstract =  {A Segment Routing (SR) path is identified by an SR segment list. A subset of segments from the segment list cannot be leveraged to distinguish one SR path from another as they may be partially congruent. SR path identification is a prerequisite for various use cases such as performance measurement and end-to-end 1+1 path protection. In an SR over MPLS (SR-MPLS) data plane, an egress node cannot determine on which SR path a packet traversed the network from the label stack because the segment identifiers are removed from the label stack as the packet transits the network. This document defines a Path Segment Identifier (PSID) to identify an SR path on the egress node of the path.},
}