%% You should probably cite draft-ietf-bess-evpn-overlay instead of this I-D.
@techreport{sd-l2vpn-evpn-overlay-01,
    number =    {draft-sd-l2vpn-evpn-overlay-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-sd-l2vpn-evpn-overlay/01/},
    author =    {Ali Sajassi and John Drake and Dr. Nabil N. Bitar and Aldrin Isaac and Jim Uttaro and Wim Henderickx},
    title =     {{A Network Virtualization Overlay Solution using E-VPN}},
    pagetotal = 21,
    year =      2013,
    month =     feb,
    day =       25,
    abstract =  {This document describes how E-VPN can be used as an NVO solution and explores the various tunnel encapsulation options over IP and their impact on the E-VPN control-plane and procedures. In particular, the following encapsulation options are analyzed: MPLS over GRE, VXLAN, and NVGRE.},
}