Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual Transport Network

Document Type Replaced Internet-Draft (individual)
Authors Chongfeng Xie  , Chenhao Ma  , Jie Dong  , Zhenbin Li 
Last updated 2021-02-22
Replaced by draft-ietf-lsr-isis-sr-vtn-mt
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Intended RFC status (None)
Expired & archived
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IESG IESG state Replaced by draft-ietf-lsr-isis-sr-vtn-mt
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


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 and the underlay network. A Virtual Transport Network (VTN) is a virtual underlay network which consists of a subset of the network topology and network resources allocated from the physical network. A VTN could be used as the underlay for one or a group of VPN+ services. In some network scenarios, each VTN can be associated with a unique logicial 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.


Chongfeng Xie (
Chenhao Ma (
Jie Dong (
Zhenbin Li (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)