%% You should probably cite rfc4031 instead of this I-D.
@techreport{ietf-l3vpn-requirements-02,
    number =    {draft-ietf-l3vpn-requirements-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-l3vpn-requirements/02/},
    author =    {Marco Carugi and Dave McDysan},
    title =     {{Service Requirements for Layer 3 Provider Provisioned Virtual Private Networks (PPVPNs)}},
    pagetotal = 50,
    year =      2004,
    month =     jul,
    day =       20,
    abstract =  {This document provides requirements for Layer 3 Virtual Private Networks (L3VPNs). It identifies requirements applicable to a number of individual approaches that a Service Provider may use to provision a Virtual Private Network (VPN) service. This document expresses a service provider perspective, based upon past experience with IP-based service offerings and the ever-evolving needs of the customers of such services. Toward this end, it first defines terminology and states general requirements. Detailed requirements are expressed from a customer perspective as well as that of a service provider. This memo provides information for the Internet community.},
}