%% You should probably cite rfc5570 instead of this I-D.
@techreport{stjohns-sipso-11,
    number =    {draft-stjohns-sipso-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-stjohns-sipso/11/},
    author =    {Ran Atkinson and Michael StJohns},
    title =     {{Common Architecture Label IPv6 Security Option (CALIPSO)}},
    pagetotal = 52,
    year =      2009,
    month =     mar,
    day =       6,
    abstract =  {This document describes an optional method for encoding explicit packet Sensitivity Labels on IPv6 packets. It is intended for use only within Multi-Level Secure (MLS) networking environments that are both trusted and trustworthy. This memo provides information for the Internet community.},
}