%% You should probably cite rfc7839 instead of this I-D.
@techreport{ietf-dhc-access-network-identifier-01,
    number =    {draft-ietf-dhc-access-network-identifier-01},
    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-dhc-access-network-identifier/01/},
    author =    {Shwetha Bhandari and Sri Gundavelli and Jouni Korhonen and Mark Grayson},
    title =     {{Access-Network-Identifier Option in DHCP}},
    pagetotal = 17,
    year =      2013,
    month =     oct,
    day =       21,
    abstract =  {This document specifies the format and mechanism for encoding access network identifiers in DHCPv4 and DHCPv6 messages by defining new access network identifier options and sub-options.},
}