BGP-LS with Flex-Algo for Segment Routing based Virtual Transport Networks
draft-zhu-idr-bgpls-sr-vtn-flexalgo-01

Document Type Active Internet-Draft (individual)
Authors Yongqing Zhu  , Jie Dong  , Zhibo Hu
Last updated 2021-02-22
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IDR Working Group                                                 Y. Zhu
Internet-Draft                                             China Telecom
Intended status: Standards Track                                 J. Dong
Expires: August 26, 2021                                           Z. Hu
                                                     Huawei Technologies
                                                       February 22, 2021

   BGP-LS with Flex-Algo for Segment Routing based Virtual Transport
                                Networks
                 draft-zhu-idr-bgpls-sr-vtn-flexalgo-01

Abstract

   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 a particular set of resources in the underlay
   network.  A Virtual Transport Network (VTN) is a virtual underlay
   network which has a customized network topology and a set of network
   resources allocated from the physical network.  A VTN could be used
   to support one or a group of VPN+ services.

   When Segment Routing is used as the data plane to provide VTNs, each
   VTN can be allocated with a group of SIDs to identify the topology
   and resource attributes of network segments in the VTN.  The
   association between the network topology, the network resource
   attributes and the SR SIDs may need to be distributed to a
   centralized network controller.  For network scenarios where each VTN
   can be identified by a unique Flex-Algo ID, this document describes a
   mechanism to distribute the information of SR based VTNs using BGP-LS
   with Flex-Algo.

Status of This Memo

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Zhu, et al.              Expires August 26, 2021                [Page 1]
Internet-Draft         BGP-LS Flex-Algo for SR VTN         February 2021

   This Internet-Draft will expire on August 26, 2021.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Advertisement of VTN Topology Attribute . . . . . . . . . . .   3
     2.1.  Intra-domain Topology Advertisement . . . . . . . . . . .   4
     2.2.  Inter-Domain Topology Advertisement . . . . . . . . . . .   4
   3.  Advertisement of VTN Resource Attribute . . . . . . . . . . .   6
   4.  Scalability Considerations  . . . . . . . . . . . . . . . . .   7
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   7
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   Enhanced VPN (VPN+) is an enhancement to VPN services to support the
   needs of new applications, particularly including the applications
   that are associated with 5G services.  These applications require
   enhanced isolation and have more stringent performance requirements
   than that can be provided with traditional overlay VPNs.  Thus these
   properties require integration between the overlay VPN and the
   underlay networks.  [I-D.ietf-teas-enhanced-vpn] specifies the
   framework of enhanced VPN and describes the candidate component
   technologies in different network planes and layers.  An enhanced VPN
   can be used for 5G network slicing, and will also be of use in other
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