%% You should probably cite draft-ietf-bess-virtual-subnet-fib-reduction instead of this I-D.
@techreport{xu-l3vpn-virtual-subnet-fib-reduction-01,
    number =    {draft-xu-l3vpn-virtual-subnet-fib-reduction-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-xu-l3vpn-virtual-subnet-fib-reduction/01/},
    author =    {Xiaohu Xu and Susan Hares and Fan Yongbing and Christian Jacquenet and Truman Boyes and Brendan Fee and Wim Henderickx},
    title =     {{FIB Reduction in Virtual Subnet}},
    pagetotal = 6,
    year =      2014,
    month =     aug,
    day =       5,
    abstract =  {Virtual Subnet is a BGP/MPLS IP VPN-based subnet extension solution which is intended for building Layer3 network virtualization overlays within and/or across data centers. This document describes a mechanism for reducing the FIB size of PE routers in the Virtual Subnet context.},
}