%% You should probably cite draft-xu-mpls-payload-protocol-identifier-09 instead of this revision.
@techreport{xu-mpls-payload-protocol-identifier-06,
    number =    {draft-xu-mpls-payload-protocol-identifier-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-xu-mpls-payload-protocol-identifier/06/},
    author =    {Xiaohu Xu and Hamid Assarpour and Shaowen Ma and Francois Clad},
    title =     {{MPLS Payload Protocol Identifier}},
    pagetotal = 8,
    year =      2019,
    month =     mar,
    day =       25,
    abstract =  {The MPLS label stack has no explicit protocol identifier field to indicate the protocol type of the MPLS payload. This document proposes a mechanism for containing a protocol identifier field within the MPLS packet, which is useful for any new encapsulation header which may need to be encapsulated with an MPLS header.},
}