%% You should probably cite rfc7150 instead of this I-D.
@techreport{ietf-pce-vendor-constraints-10,
    number =    {draft-ietf-pce-vendor-constraints-10},
    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-pce-vendor-constraints/10/},
    author =    {Fatai Zhang and Adrian Farrel},
    title =     {{Conveying Vendor-Specific Constraints in the Path Computation Element Protocol}},
    pagetotal = 11,
    year =      2013,
    month =     apr,
    day =       23,
    abstract =  {The Path Computation Element Protocol (PCEP) is used to convey path computation requests and responses between Path Computation Clients (PCCs) and Path Computation Elements (PCEs), and also between cooperating PCEs. In PCEP the path computation requests carry details of the constraints and objective functions that the PCC wishes the PCE to apply in its computation. This document defines a facility to carry vendor-specific information in PCEP using a dedicated object and a new Type-Length-Variable that can be carried in any existing PCEP object.},
}