BGP-LS with Flex-Algo for Segment Routing based Virtual Transport Networks

The information below is for an old version of the document
Document Type Expired Internet-Draft (individual)
Authors Yongqing Zhu  , Jie Dong  , Zhibo Hu
Last updated 2020-09-10 (latest revision 2020-03-09)
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This Internet-Draft is no longer active.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+) as defined in I-D.ietf-teas-enhanced-vpn aims to provide enhanced VPN service to support 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. I-D.dong-idr-bgpls-sr-enhanced-vpn defines the BGP-LS extensions to distribute the information of Segment Routing (SR) based VTNs to external entities, such as the network controllers. This document describes a simplified mechanism to distribute the information of SR based VTNs using BGP-LS with Flex-Algo.


Yongqing Zhu (
Jie Dong (
Zhibo Hu (

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