%% You should probably cite draft-ietf-bess-bgp-multicast instead of this I-D.
@techreport{zzhang-bess-bgp-multicast-00,
    number =    {draft-zzhang-bess-bgp-multicast-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-zzhang-bess-bgp-multicast/00/},
    author =    {Zhaohui (Jeffrey) Zhang and Keyur Patel},
    title =     {{BGP Based Multicast}},
    pagetotal = 12,
    year =      2015,
    month =     oct,
    day =       16,
    abstract =  {This document describes multicast signaling based on Border Gateway Protocol (BGP).},
}