@misc{rfc6709,
    series =    {Request for Comments},
    number =    6709,
    howpublished =  {RFC 6709},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC6709},
    url =       {https://www.rfc-editor.org/info/rfc6709},
    author =    {Brian E. Carpenter and Dr. Bernard D. Aboba and Stuart Cheshire},
    title =     {{Design Considerations for Protocol Extensions}},
    pagetotal = 42,
    year =      2012,
    month =     sep,
    abstract =  {This document discusses architectural issues related to the extensibility of Internet protocols, with a focus on design considerations. It is intended to assist designers of both base protocols and extensions. Case studies are included. A companion document, RFC 4775 (BCP 125), discusses procedures relating to the extensibility of IETF protocols. This document is not an Internet Standards Track specification; it is published for informational purposes.},
}