%% You should probably cite draft-ietf-bfd-yang instead of this I-D.
@techreport{zheng-bfd-yang-04,
    number =    {draft-zheng-bfd-yang-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-zheng-bfd-yang/04/},
    author =    {Lianshu Zheng and Reshad Rahman and Santosh Pallagatti and Mahesh Jethanandani and Greg Mirsky},
    title =     {{Yang Data Model for Bidirectional Forwarding Detection (BFD)}},
    pagetotal = 37,
    year =      2015,
    month =     jul,
    day =       6,
    abstract =  {This document defines a YANG data model that can be used to configure and manage Bidirectional Forwarding Detection (BFD).},
}