%% You should probably cite rfc6517 instead of this I-D.
@techreport{ietf-l3vpn-mvpn-considerations-06,
    number =    {draft-ietf-l3vpn-mvpn-considerations-06},
    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-mvpn-considerations/06/},
    author =    {Raymond Zhang and Dr. Nabil N. Bitar and Thomas Morin and Ben Niven-Jenkins and Nicolai Leymann and Yuji Kamite},
    title =     {{Mandatory Features in a Layer 3 Multicast BGP/MPLS VPN Solution}},
    pagetotal = 41,
    year =      2010,
    month =     feb,
    day =       2,
    abstract =  {More that one set of mechanisms to support multicast in a layer 3 BGP/MPLS VPN has been defined. These are presented in the documents that define them as optional building blocks. To enable interoperability between implementations, this document defines a subset of features that is considered mandatory for a multicast BGP/MPLS VPN implementation. This will help implementers and deployers understand which L3VPN multicast requirements are best satisfied by each option. This document is not an Internet Standards Track specification; it is published for informational purposes.},
}