%% You should probably cite draft-ietf-pcp-proxy instead of this I-D.
@techreport{bpw-pcp-proxy-02,
    number =    {draft-bpw-pcp-proxy-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-bpw-pcp-proxy/02/},
    author =    {Mohamed Boucadair and Reinaldo Penno and Dan Wing and Francis Dupont},
    title =     {{Port Control Protocol (PCP) Proxy Function}},
    pagetotal = 12,
    year =      2011,
    month =     sep,
    day =       12,
    abstract =  {This document specifies the behavior of a PCP Proxy element, for instance embedded in Customer Premise routers.},
}