%% You should probably cite draft-xu-isis-routable-ip-address instead of this I-D.
@techreport{xu-isis-ipv6-router-id-00,
    number =    {draft-xu-isis-ipv6-router-id-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-xu-isis-ipv6-router-id/00/},
    author =    {Xiaohu Xu},
    title =     {{Carrying IPv6 Router ID in IS-IS Router Capability TLV}},
    pagetotal = 3,
    year =      2014,
    month =     apr,
    day =       24,
    abstract =  {This document proposes a new sub-TLV of the IS-IS Router CAPABILITY TLV, called IPv6 Router ID sub-TLV.},
}