%% You should probably cite rfc7555 instead of this I-D.
@techreport{ietf-mpls-proxy-lsp-ping-04,
    number =    {draft-ietf-mpls-proxy-lsp-ping-04},
    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-mpls-proxy-lsp-ping/04/},
    author =    {George Swallow and Vanson Lim and Sam Aldrin},
    title =     {{Proxy MPLS Echo Request}},
    pagetotal = 25,
    year =      2015,
    month =     feb,
    day =       27,
    abstract =  {This document defines a means of remotely initiating Multiprotocol Label Switched Protocol Pings on Label Switched Paths. An MPLS Proxy Ping Request is sent to any Label Switching Router along a Label Switched Path. The primary motivations for this facility are first to limit the number of messages and related processing when using LSP Ping in large Point-to-Multipoint LSPs, and second to enable leaf to leaf/root tracing.},
}