%% You should probably cite rfc8459 instead of this I-D.
@techreport{ietf-sfc-hierarchical-02,
    number =    {draft-ietf-sfc-hierarchical-02},
    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-sfc-hierarchical/02/},
    author =    {David Dolson and Shunsuke Homma and Diego Lopez and Mohamed Boucadair and Dapeng Liu and Ting Ao and Vu Anh Vu},
    title =     {{Hierarchical Service Function Chaining (hSFC)}},
    pagetotal = 25,
    year =      2017,
    month =     jan,
    day =       13,
    abstract =  {Hierarchical Service Function Chaining (hSFC) is a network architecture allowing an organization to decompose a large-scale network into multiple domains of administration. The goals of hSFC are to make a large-scale network easier to reason about, simpler to control and to support independent functional groups within large network operators.},
}