@misc{rfc4031,
    series =    {Request for Comments},
    number =    4031,
    howpublished =  {RFC 4031},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC4031},
    url =       {https://www.rfc-editor.org/info/rfc4031},
    author =    {Marco Carugi and Dave McDysan},
    title =     {{Service Requirements for Layer 3 Provider Provisioned Virtual Private Networks (PPVPNs)}},
    pagetotal = 50,
    year =      2005,
    month =     apr,
    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.},
}