%% You should probably cite rfc7881 instead of this I-D.
@techreport{ietf-bfd-seamless-ip-04,
    number =    {draft-ietf-bfd-seamless-ip-04},
    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-bfd-seamless-ip/04/},
    author =    {Nobo Akiya and Carlos Pignataro and David Ward},
    title =     {{Seamless Bidirectional Forwarding Detection (S-BFD) for IPv4, IPv6 and MPLS}},
    pagetotal = 8,
    year =      2016,
    month =     apr,
    day =       13,
    abstract =  {This document defines procedures to use Seamless Bidirectional Forwarding Detection (S-BFD) for IPv4, IPv6 and MPLS environments.},
}