%% You should probably cite draft-zhu-lsr-isis-sr-vtn-flexalgo-07 instead of this revision.
@techreport{zhu-lsr-isis-sr-vtn-flexalgo-03,
    number =    {draft-zhu-lsr-isis-sr-vtn-flexalgo-03},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-zhu-lsr-isis-sr-vtn-flexalgo/03/},
    author =    {Yongqing Zhu and Jie Dong and Zhibo Hu},
    title =     {{Using Flex-Algo for Segment Routing based VTN}},
    pagetotal = 9,
    year =      2021,
    month =     jul,
    day =       12,
    abstract =  {Enhanced VPN (VPN+) aims to provide enhanced VPN service to support some application's needs of enhanced isolation and stringent performance requirements. VPN+ requires integration between the overlay VPN connectivity and the characteristics provided the underlay network. A Virtual Transport Network (VTN) is a virtual underlay network which has a customized network topology and a set of network resources allocated from the physical network. A VTN could be used as the underlay for one or a group of VPN+ services. The topology of a VTN can be defined using Flex-Algo. In some network scenarios, each VTN can be associated with a unique Flex- Algo, and the set of network resources of the VTN can be instantiated as sub-interfaces or member links of the L3 interfaces. This document describes the mechanisms to build the SR based VTNs using SR Flex-Algo and IGP L2 bundle with minor extensions.},
}