%% You should probably cite draft-ietf-pim-multiple-upstreams-reqs instead of this I-D.
@techreport{contreras-pim-multiple-upstreams-reqs-00,
    number =    {draft-contreras-pim-multiple-upstreams-reqs-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-contreras-pim-multiple-upstreams-reqs/00/},
    author =    {Luis M. Contreras and Carlos J. Bernardos},
    title =     {{Requiremnets for the extension of the MLD proxy functionality to support multiple upstream interfaces}},
    pagetotal = 8,
    year =      2015,
    month =     mar,
    day =       7,
    abstract =  {The purpose of this document is to define the requirements for a MLD proxy with multiple interfaces covering a variety of applicability scenarios.},
}