@misc{rfc3809,
    series =    {Request for Comments},
    number =    3809,
    howpublished =  {RFC 3809},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC3809},
    url =       {https://www.rfc-editor.org/info/rfc3809},
    author =    {Ananth Nagarajan},
    title =     {{Generic Requirements for Provider Provisioned Virtual Private Networks (PPVPN)}},
    pagetotal = 25,
    year =      2004,
    month =     jun,
    abstract =  {This document describes generic requirements for Provider Provisioned Virtual Private Networks (PPVPN). The requirements are categorized into service requirements, provider requirements and engineering requirements. These requirements are not specific to any particular type of PPVPN technology, but rather apply to all PPVPN technologies. All PPVPN technologies are expected to meet the umbrella set of requirements described in this document. This memo provides information for the Internet community.},
}