%% You should probably cite draft-ietf-mpls-tp-shared-ring-protection instead of this I-D.
@techreport{cheng-mpls-tp-shared-ring-protection-04,
    number =    {draft-cheng-mpls-tp-shared-ring-protection-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-cheng-mpls-tp-shared-ring-protection/04/},
    author =    {Weiqiang Cheng and Lei Wang and Han Li and Huub van Helvoort and Kai Liu and Jie Dong and He Jia and Fang Li and Yang Jian and Junfang Wang},
    title =     {{MPLS-TP Shared-Ring protection (MSRP) mechanism for ring topology}},
    pagetotal = 42,
    year =      2015,
    month =     feb,
    day =       2,
    abstract =  {This document describes requirements, architecture and solutions for MPLS-TP Shared Ring Protection (MSRP) in the ring topology for point- to-point (P2P) services. The mechanism of MSRP is illustrated and how it satisfies the requirements in RFC 5654 for optimized ring protection is analyzed.},
}