%% You should probably cite draft-ietf-ccamp-eth-client-te-topo-yang instead of this I-D.
@techreport{zheng-ccamp-client-topo-yang-00,
    number =    {draft-zheng-ccamp-client-topo-yang-00},
    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-ccamp-client-topo-yang/00/},
    author =    {Haomian Zheng and Aihua Guo and Italo Busi and Yunbin Xu and Yang Zhao},
    title =     {{A YANG Data Model for Client-layer Topology}},
    pagetotal = 13,
    year =      ** No value found for 'doc.pub_date.year' **,
    month =     ** No value found for 'doc.pub_date' **,
    day =       ** No value found for 'doc.pub_date.day' **,
    abstract =  {A transport network is a server-layer network to provide connectivity services to its client. In this draft the topology of client is described.},
}