%% You should probably cite rfc6930 instead of this I-D.
@techreport{ietf-softwire-6rd-radius-attrib-11,
    number =    {draft-ietf-softwire-6rd-radius-attrib-11},
    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-softwire-6rd-radius-attrib/11/},
    author =    {Dayong Guo and Sheng Jiang and Rémi Després and Roberta Maglione},
    title =     {{RADIUS Attribute for IPv6 Rapid Deployment on IPv4 Infrastructures (6rd)}},
    pagetotal = 12,
    year =      2013,
    month =     jan,
    day =       24,
    abstract =  {The IPv6 Rapid Deployment on IPv4 Infrastructures (6rd) provides both IPv4 and IPv6 connectivity services simultaneously during the IPv4/IPv6 coexistence period. The Dynamic Host Configuration Protocol (DHCP) 6rd option has been defined to configure the 6rd Customer Edge (CE). However, in many networks, the configuration information may be stored in the Authentication Authorization and Accounting (AAA) servers, while user configuration is mainly acquired from a Broadband Network Gateway (BNG) through the DHCP protocol. This document defines a Remote Authentication Dial-In User Service (RADIUS) attribute that carries 6rd configuration information from the AAA server to BNGs.},
}