%% You should probably cite rfc7981 instead of this I-D.
@techreport{ietf-isis-rfc4971bis-01,
    number =    {draft-ietf-isis-rfc4971bis-01},
    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-isis-rfc4971bis/01/},
    author =    {Les Ginsberg and Stefano Previdi and Mach Chen},
    title =     {{IS-IS Extensions for Advertising Router Info}},
    pagetotal = 9,
    year =      2016,
    month =     apr,
    day =       13,
    abstract =  {This document defines a new optional Intermediate System to Intermediate System (IS-IS) TLV named CAPABILITY, formed of multiple sub-TLVs, which allows a router to announce its capabilities within an IS-IS level or the entire routing domain.},
}