%% You should probably cite rfc7775 instead of this I-D.
@techreport{ietf-isis-route-preference-02,
    number =    {draft-ietf-isis-route-preference-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-ietf-isis-route-preference/02/},
    author =    {Les Ginsberg and Stephane Litkowski and Stefano Previdi},
    title =     {{IS-IS Route Preference for Extended IP and IPv6 Reachability}},
    pagetotal = 11,
    year =      2015,
    month =     oct,
    day =       16,
    abstract =  {In existing specifications, the route preferences for IPv4/IPv6 Extended Reachability TLVs are not explicitly stated. There are also inconsistencies in the definition of how the up/down bit applies to route preference when the prefix advertisement appears in Level 2 Link State Protocol Data Units (LSPs). This document addresses these issues.},
}