%% You should probably cite rfc6793 instead of this I-D.
@techreport{ietf-idr-rfc4893bis-06,
    number =    {draft-ietf-idr-rfc4893bis-06},
    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-idr-rfc4893bis/06/},
    author =    {Quaizar Vohra and Enke Chen},
    title =     {{BGP Support for Four-octet AS Number Space}},
    pagetotal = 12,
    year =      2012,
    month =     apr,
    day =       24,
    abstract =  {The Autonomous System (AS) number is encoded as a two-octet entity in the base BGP specification. This document describes extensions to BGP to carry the Autonomous System numbers as four-octet entities. This document obsoletes RFC 4893.},
}