%% You should probably cite draft-ietf-isis-udl instead of this I-D.
@techreport{ginsberg-isis-udl-01,
    number =    {draft-ginsberg-isis-udl-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-ginsberg-isis-udl/01/},
    author =    {Les Ginsberg and Sina Mirtorabi and Stefano Previdi and Abhay Roy},
    title =     {{IS-IS Support for Unidirectional Links}},
    pagetotal = 17,
    year =      2013,
    month =     jul,
    day =       13,
    abstract =  {This document defines support for the operation of IS-IS over Unidirectional Links without the use of tunnels or encapsulation of IS-IS Protocol Data Units. Adjacency establishment when the return path from the router at the receive end of a unidirectional link to the router at the transmit end of the unidirectional link is via another unidirectional link is supported. The extensions defined here are backwards compatible - only the routers directly connected to a unidirectional link need to be upgraded.},
}