Hello, folks, we have submitted a new draft of https://tools.ietf.org/html/draft-xie-lsr-isis-sr-vtn-mt-00 .
It is about Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual Transport Network. Enhanced VPN (VPN+) as defined in I-D.ietf-teas-enhanced-vpn aims to provide enhanced VPN service to support some applications's needs of enhanced isolation and stringent performance requirements. VPN+ requries integration between the overlay VPN and the underlay network. A Virtual Transport Network (VTN) is a virtual network which consists of a subset of the network toplogy and network resources allocated from the underlay network. A VTN could be used as the underlay for one or a group of VPN+ services. This document describes a simplified mechanism to build the SR based VTNs using IGP multi- topology together with other well-defined IS-IS extensions. Comments and suggestions are highly appreciated. Chongfeng Xie
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