%% You should probably cite draft-ietf-sfc-multi-layer-oam instead of this I-D.
@techreport{ao-sfc-oam-return-path-specified-05,
    number =    {draft-ao-sfc-oam-return-path-specified-05},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-ao-sfc-oam-return-path-specified/05/},
    author =    {Ting Ao and Greg Mirsky and Zhonghua Chen},
    title =     {{Controlled Return Path for Service Function Chain (SFC) OAM}},
    pagetotal = 8,
    year =      2019,
    month =     dec,
    day =       1,
    abstract =  {This document defines an extension to the Service Function Chain (SFC) Operation, Administration and Maintenance (OAM) that enables control of the Echo Reply return path directing it over a Reverse Service Function Path. Enforcing the specific return path can be used to verify the bidirectional connectivity of SFC and increase the robustness of SFC OAM.},
}