%% You should probably cite rfc6514 instead of this I-D.
@techreport{ietf-l3vpn-2547bis-mcast-bgp-08,
    number =    {draft-ietf-l3vpn-2547bis-mcast-bgp-08},
    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-l3vpn-2547bis-mcast-bgp/08/},
    author =    {Yakov Rekhter and Rahul Aggarwal and Eric C. Rosen and Thomas Morin},
    title =     {{BGP Encodings and Procedures for Multicast in MPLS/BGP IP VPNs}},
    pagetotal = 59,
    year =      2009,
    month =     sep,
    day =       30,
    abstract =  {This document describes the BGP encodings and procedures for exchanging the information elements required by Multicast in MPLS/BGP IP VPNs, as specified in RFC 6513. {[}STANDARDS-TRACK{]}},
}