%% You should probably cite rfc2341 instead of this I-D.
@techreport{valencia-l2f-00,
    number =    {draft-valencia-l2f-00},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-valencia-l2f/00/},
    author =    {Morgan Littlewood and Andy Valencia and Tim Kolar and Tim Kolar and Tim Kolar},
    title =     {{Cisco Layer Two Forwarding (Protocol) "L2F"}},
    pagetotal = 29,
    year =      1997,
    month =     oct,
    day =       7,
    abstract =  {This document describes the Layer Two Forwarding protocol (L2F) which permits the tunneling of the link layer (i.e., HDLC, async HDLC, or SLIP frames) of higher level protocols. This memo describes a historic protocol for the Internet community. It does not specify an Internet standard of any kind.},
}