%% You should probably cite draft-ietf-nvo3-security-requirements instead of this I-D.
@techreport{hartman-nvo3-security-requirements-01,
    number =    {draft-hartman-nvo3-security-requirements-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-hartman-nvo3-security-requirements/01/},
    author =    {Sam Hartman and Dacheng Zhang and Margaret Cullen},
    title =     {{Security Requirements of NVO3}},
    pagetotal = 13,
    year =      2013,
    month =     jul,
    day =       14,
    abstract =  {This draft discusses the security requirements and several issues which need to be considered in securing a virtualized data center network for multiple tenants (a NVO3 network for short). In addition, the draft also attempts to discuss how such issues could be addressed or mitigated.},
}