%% You should probably cite draft-ietf-dhc-relay-port instead of this I-D.
@techreport{shen-dhc-client-port-02,
    number =    {draft-shen-dhc-client-port-02},
    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/02/},
    author =    {Naiming Shen and Enke Chen},
    title =     {{Generalized Source UDP Port of DHCP Relay}},
    pagetotal = 7,
    year =      2016,
    month =     jul,
    day =       18,
    abstract =  {This document extends the DHCP and DHCPv6 protocols for the UDP transport from relay agent to server and allows the port to be any valid number on the DHCP relay system.},
}