%% You should probably cite rfc7814 instead of this I-D.
@techreport{ietf-bess-virtual-subnet-07,
    number =    {draft-ietf-bess-virtual-subnet-07},
    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-bess-virtual-subnet/07/},
    author =    {Xiaohu Xu and Christian Jacquenet and Robert Raszuk and Truman Boyes and Brendan Fee},
    title =     {{Virtual Subnet: A BGP/MPLS IP VPN-Based Subnet Extension Solution}},
    pagetotal = 15,
    year =      2015,
    month =     dec,
    day =       9,
    abstract =  {This document describes a BGP/MPLS IP VPN-based subnet extension solution referred to as "Virtual Subnet", which can be used for building Layer 3 network virtualization overlays within and/or between data centers.},
}