%% You should probably cite draft-ietf-lsr-isis-sr-vtn-mt-08 instead of this revision. @techreport{ietf-lsr-isis-sr-vtn-mt-04, number = {draft-ietf-lsr-isis-sr-vtn-mt-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-lsr-isis-sr-vtn-mt/04/}, author = {Chongfeng Xie and Chenhao Ma and Jie Dong and Zhenbin Li}, title = {{Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual Transport Network}}, pagetotal = 9, year = 2023, month = mar, day = 13, 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 by the underlay network. A Virtual Transport Network (VTN) is a virtual underlay network which consists of a subset of network resources allocated on network nodes and links in a customized topology of the physical network. A VTN could be used as the underlay to support one or a group of VPN+ services. In some network scenarios, each VTN can be associated with a unique logical network topology. This document describes a mechanism to build the SR based VTNs using IS-IS Multi-Topology together with other well-defined IS-IS extensions.}, }