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

The information below is for an old version of the document.
Document Type
This is an older version of an Internet-Draft whose latest revision state is "Active".
Expired & archived
Authors Chongfeng Xie , Chenhao Ma , Jie Dong , Zhenbin Li
Last updated 2023-01-11 (Latest revision 2022-07-10)
Replaces draft-xie-lsr-isis-sr-vtn-mt
RFC stream Internet Engineering Task Force (IETF)
Additional resources Mailing list discussion
Stream WG state WG Document
Document shepherd (None)
IESG IESG state Expired
Consensus boilerplate Unknown
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


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.


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.)