%% You should probably cite draft-ietf-pce-inter-layer-ext instead of this I-D.
@techreport{oki-pce-inter-layer-ext-00,
    number =    {draft-oki-pce-inter-layer-ext-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-oki-pce-inter-layer-ext/00/},
    author =    {Eiji Oki},
    title =     {{Extensions to the Path Computation Element communication Protocol (PCEP) for Inter-Layer MPLS and GMPLS Traffic Engineering}},
    pagetotal = 1,
    year =      2007,
    month =     oct,
    day =       23,
    abstract =  {The Path Computation Element (PCE) provides path computation functions in support of traffic engineering in Multi-Protocol Label Switching (MPLS) and Generalized MPLS (GMPLS) networks. MPLS and GMPLS networks may be constructed from layered service networks. It is advantageous for overall network efficiency to provide end-to-end traffic engineering across multiple network layers through a process called inter-layer traffic engineering. PCE is a candidate solution for such requirements.},
}