BGP SPF for Virtual Transport Network (VTN)
draft-dong-lsvr-bgp-spf-vtn-00

Document Type Active Internet-Draft (individual)
Authors Jie Dong  , Zhenbin Li  , Haibo Wang 
Last updated 2021-02-22
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LSVR Working Group                                               J. Dong
Internet-Draft                                                     Z. Li
Intended status: Standards Track                                 H. Wang
Expires: August 26, 2021                             Huawei Technologies
                                                       February 22, 2021

              BGP SPF for Virtual Transport Network (VTN)
                     draft-dong-lsvr-bgp-spf-vtn-00

Abstract

   A Virtual Transport Network (VTN) is a virtual underlay network which
   consists of a customized network topology and a set of network
   resource allocated from the physical network.  In a network, multiple
   VTNs can be created to meet different service requirements, and
   services may be mapped to the same or different VTNs.

   In networks where BGP Shortest Path First (SPF) is used to distribute
   the link-state information among network nodes, the information of
   VTNs needs to be distributed along with the basic network
   information.  This document specifies the BGP SPF mechanisms with
   necessary extensions to distribute the VTN information and perform
   VTN-specific path computaton.

Status of This Memo

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

Copyright Notice

   Copyright (c) 2021 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Applicability of VTN related BGP-LS Extensions to BGP SPF . .   3
     2.1.  Reuse of BGP-LS TLVs for BGP SPF VTN  . . . . . . . . . .   3
     2.2.  VTN Topology and Resource Distribution  . . . . . . . . .   5
   3.  SPF Calculation for VTNs  . . . . . . . . . . . . . . . . . .   5
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   6.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   6
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   The concept of Virtual Transport Network (VTN) is introduced in
   [I-D.ietf-teas-enhanced-vpn].  A VTN is a virtual underlay network
   which has customized network topology and a set of dedicated or
   shared network resources.  In a network, different VTNs may be
   created to meet different service requirements, and services can be
   mapped to the same or different VTNs.

   [I-D.ietf-spring-sr-for-enhanced-vpn] describes the use of resource-
   aware segments [I-D.ietf-spring-resource-aware-segments] to build SR
   based VTNs.  The SIDs of each VTN and the associated topology and
   resource attributes need to be distributed using the control plane.
   [I-D.dong-lsr-sr-enhanced-vpn] specifies the IGP mechanism and
   extensions to build a set of SR based VTNs.
   [I-D.dong-idr-bgpls-sr-enhanced-vpn] further specifies the BGP-LS
   mechanisms and extensions to advertise the VTN information in each
   domain and the VTN information on the inter-domain links to the
   network controller, so that the controller could use the collected
   information to build the inter-domain SR VTNs.

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