%% You should probably cite draft-ietf-dhc-relay-port instead of this I-D.
@techreport{shen-dhc-client-port-00,
    number =    {draft-shen-dhc-client-port-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-shen-dhc-client-port/00/},
    author =    {Naiming Shen and Enke Chen},
    title =     {{Generalize Client UDP Port Number of DHCP Relay}},
    pagetotal = 5,
    year =      2016,
    month =     jun,
    day =       21,
    abstract =  {This document extends the DHCP and DHCPv6 protocols for the UDP transport from server to client and allows the port to be any valid number on the DHCP relay system.},
}