%% You should probably cite draft-ietf-l3vpn-end-system-requirements instead of this I-D.
@techreport{fang-l3vpn-end-system-requirements-01,
    number =    {draft-fang-l3vpn-end-system-requirements-01},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-fang-l3vpn-end-system-requirements/01/},
    author =    {Maria Napierala and Luyuan Fang},
    title =     {{Requirements for Extending BGP/MPLS VPNs to End-Systems}},
    pagetotal = 15,
    year =      2012,
    month =     nov,
    day =       5,
    abstract =  {Service Providers commonly use BGP/MPLS VPNs {[}RFC 4364{]} as the technology for providing wide-area virtual private network services. This technology has proven to scale to a very large number of VPNs and attachment points, and it is well suited for extending VPN connectivity to end-systems operating in a multi- tenant environments. Virtualized end-system environment imposes additional requirements to MPLS/BGP VPN technology when applied to end-system networking, which are defined in this document.},
}