%% You should probably cite rfc7796 instead of this I-D.
@techreport{ietf-l2vpn-vpls-pe-etree-01,
    number =    {draft-ietf-l2vpn-vpls-pe-etree-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-ietf-l2vpn-vpls-pe-etree/01/},
    author =    {Yuanlong Jiang and Lucy Yong and Manuel Paul and Frederic JOUNAY and Florin Balus and Wim Henderickx and Ali Sajassi},
    title =     {{VPLS PE Model for E-Tree Support}},
    pagetotal = 23,
    year =      2013,
    month =     feb,
    day =       7,
    abstract =  {A generic VPLS solution for E-Tree services is proposed which uses VLANs to indicate root/leaf traffic. A VPLS Provider Edge (PE) model is illustrated as an example for the solution. In the solution, E- Tree VPLS PEs are interconnected by PWs which carry the VLAN indicating the E-Tree attribute, the MAC address based Ethernet forwarding engine and the PW work in the same way as before. A signaling mechanism for E-Tree capability and VLAN mapping negotiation is further described.},
}