%% You should probably cite rfc7110 instead of this I-D.
@techreport{ietf-mpls-return-path-specified-lsp-ping-15,
    number =    {draft-ietf-mpls-return-path-specified-lsp-ping-15},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ietf-mpls-return-path-specified-lsp-ping/15/},
    author =    {Mach Chen and Wei Cao and Ning So and Frederic JOUNAY and Simon DeLord},
    title =     {{Return Path Specified Label Switched Path (LSP) Ping}},
    pagetotal = 21,
    year =      2013,
    month =     oct,
    day =       21,
    abstract =  {This document defines extensions to the data-plane failure-detection protocol for Multiprotocol Label Switching (MPLS) Label Switched Paths (LSPs) known as "LSP ping". These extensions allow a selection of the LSP to be used for the echo reply return path. Enforcing a specific return path can be used to verify bidirectional connectivity and also increase LSP ping robustness.},
}