@techreport{ietf-spring-sr-for-enhanced-vpn-02, number = {draft-ietf-spring-sr-for-enhanced-vpn-02}, type = {Internet-Draft}, institution = {Internet Engineering Task Force}, publisher = {Internet Engineering Task Force}, note = {Work in Progress}, url = {https://datatracker.ietf.org/doc/html/draft-ietf-spring-sr-for-enhanced-vpn-02}, author = {Jie Dong and Stewart Bryant and Takuya Miyasaka and Yongqing Zhu and Fengwei Qin and Zhenqiang Li and Francois Clad}, title = {{Segment Routing based Virtual Transport Network (VTN) for Enhanced VPN}}, pagetotal = 19, year = 2022, month = mar, day = 5, abstract = {Segment Routing (SR) leverages the source routing paradigm. A node steers a packet through an ordered list of instructions, called "segments". A segment can represent topological or service based instructions. A segment can further be associated with a set of network resources used for executing the instruction. Such a segment is called resource-aware segment. Resource-aware Segment Identifiers (SIDs) may be used to build SR paths with a set of reserved network resources. In addition, a group of resource-aware SIDs may be used to build SR based virtual underlay networks, which have customized network topology and resource attributes required by one or a group of customers and/or services. Such virtual networks are the SR instantiations of Virtual Transport Networks (VTNs). This document describes a suggested use of resource-aware SIDs to build SR based VTNs.}, }