%% You should probably cite rfc9465 instead of this I-D.
@techreport{ietf-pim-null-register-packing-06,
    number =    {draft-ietf-pim-null-register-packing-06},
    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-pim-null-register-packing/06/},
    author =    {Vikas Ramesh Kamath and Ramakrishnan Cokkanathapuram Sundaram and Raunak Banthia and Ananya Gopal},
    title =     {{PIM Null-Register packing}},
    pagetotal = 9,
    year =      2020,
    month =     oct,
    day =       31,
    abstract =  {In PIM-SM networks PIM Register messages are sent by the Designated Router (DR) to the Rendezvous Point (RP) to signal the presence of Multicast sources in the network. There are periodic PIM Null- Registers sent by a DR to the RP to keep the state alive at the RP as long as the source is active. The PIM Null-Register message carries information about a single Multicast source and group. This document defines a standard to send information about multiple multicast sources and multicast groups in a single PIM Null-Register message, in a packed format. This document also discusses the interoperability between PIM routers that support the new packed message format and PIM routers that do not support the new format.},
}