%% You should probably cite rfc9243 instead of this I-D.
@techreport{ietf-dhc-dhcpv6-yang-21,
    number =    {draft-ietf-dhc-dhcpv6-yang-21},
    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-dhcpv6-yang/21/},
    author =    {Ian Farrer},
    title =     {{YANG Data Model for DHCPv6 Configuration}},
    pagetotal = 102,
    year =      ** No value found for 'doc.pub_date.year' **,
    month =     ** No value found for 'doc.pub_date' **,
    day =       ** No value found for 'doc.pub_date.day' **,
    abstract =  {This document describes YANG data modules for the configuration and management of DHCPv6 (Dynamic Host Configuration Protocol for IPv6) servers, relays, and clients.},
}