%% You should probably cite draft-xu-softwire-encaps-udp-02 instead of this revision.
@techreport{xu-softwire-encaps-udp-01,
    number =    {draft-xu-softwire-encaps-udp-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-softwire-encaps-udp/01/},
    author =    {Xiaohu Xu and Zhenbin Li and Nischal Sheth and Yiu Lee and Fan Yongbing and Rajiv Asati},
    title =     {{BGP Tunnel Encapsulation Attribute for UDP}},
    pagetotal = 5,
    year =      2013,
    month =     jul,
    day =       2,
    abstract =  {This document specifies a new Border Gateway Protocol (BGP) Tunnel Type of User Datagram Protocol (UDP) tunnels.},
}