%% You should probably cite rfc4667 instead of this I-D.
@techreport{ietf-l2tpext-l2vpn-07,
    number =    {draft-ietf-l2tpext-l2vpn-07},
    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-l2tpext-l2vpn/07/},
    author =    {Wei Luo},
    title =     {{Layer 2 Virtual Private Network (L2VPN) Extensions for Layer 2 Tunneling Protocol (L2TP)}},
    pagetotal = 15,
    year =      2006,
    month =     mar,
    day =       2,
    abstract =  {The Layer 2 Tunneling Protocol (L2TP) provides a standard method for setting up and managing L2TP sessions to tunnel a variety of L2 protocols. One of the reference models supported by L2TP describes the use of an L2TP session to connect two Layer 2 circuits attached to a pair of peering L2TP Access Concentrators (LACs), which is a basic form of Layer 2 Virtual Private Network (L2VPN). This document defines the protocol extensions for L2TP to set up different types of L2VPNs in a unified fashion. {[}STANDARDS-TRACK{]}},
}