%% You should probably cite draft-ietf-i2nsf-framework instead of this I-D.
@techreport{merged-i2nsf-framework-00,
    number =    {draft-merged-i2nsf-framework-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-merged-i2nsf-framework/00/},
    author =    {Linda Dunbar and Diego Lopez and Xiaojun Zhuang and Joe Parrott and Ramki Krishnan and Seetharama Rao Durbha},
    title =     {{Framework for Interface to Network Security Functions}},
    pagetotal = 16,
    year =      2015,
    month =     apr,
    day =       21,
    abstract =  {This document describes the framework for Interface to Network Security Functions and defines a reference model along with functional components.},
}