%% You should probably cite draft-ietf-sfc-hierarchical instead of this I-D.
@techreport{dolson-sfc-hierarchical-00,
    number =    {draft-dolson-sfc-hierarchical-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-dolson-sfc-hierarchical/00/},
    author =    {David Dolson and Shunsuke Homma and Diego Lopez},
    title =     {{Hierarchical Service Chaining}},
    pagetotal = 11,
    year =      2015,
    month =     may,
    day =       25,
    abstract =  {This document describes a network architecture for deploying service function chaining with multiple levels of administration within an organization. The multiple levels of administration allow operators to compartmentalize a large network into multiple domains of responsibility, with each domain being independently managed and consequently easier to reason about.},
}