@misc{rfc2189,
    series =    {Request for Comments},
    number =    2189,
    howpublished =  {RFC 2189},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC2189},
    url =       {https://www.rfc-editor.org/info/rfc2189},
    author =    {Anthony J. Ballardie},
    title =     {{Core Based Trees (CBT version 2) Multicast Routing -- Protocol Specification --}},
    pagetotal = 23,
    year =      1997,
    month =     sep,
    abstract =  {This document describes the Core Based Tree (CBT version 2) network layer multicast routing protocol. CBT builds a shared multicast distribution tree per group, and is suited to inter- and intra-domain multicast routing. This memo defines an Experimental Protocol for the Internet community.},
}