%% You should probably cite draft-ietf-bfd-unaffiliated-echo instead of this I-D.
@techreport{cw-bfd-unaffiliated-echo-01,
    number =    {draft-cw-bfd-unaffiliated-echo-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-cw-bfd-unaffiliated-echo/01/},
    author =    {Weiqiang Cheng and Ruixue Wang and Xiao Min and Aihua Liu and Reshad Rahman},
    title =     {{Unaffiliated BFD Echo Function}},
    pagetotal = 6,
    year =      2020,
    month =     jul,
    day =       13,
    abstract =  {Bidirectional Forwarding Detection (BFD) is a fault detection protocol that can quickly determine a communication failure between two forwarding engines. This document proposes a use of BFD echo where the local system supports BFD but the neighboring system does not support BFD.},
}