Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual Transport Network
draft-xie-lsr-isis-sr-vtn-mt-02

Document Type Active Internet-Draft (individual)
Authors Chongfeng Xie  , Chenhao Ma  , Jie Dong  , Zhenbin Li 
Last updated 2020-10-12
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LSR Working Group                                                 C. Xie
Internet-Draft                                                     C. Ma
Intended status: Informational                             China Telecom
Expires: April 16, 2021                                          J. Dong
                                                                   Z. Li
                                                     Huawei Technologies
                                                        October 13, 2020

   Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual
                           Transport Network
                    draft-xie-lsr-isis-sr-vtn-mt-02

Abstract

   Enhanced VPN (VPN+) as defined in I-D.ietf-teas-enhanced-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 network
   which consists of a subset of the network topology 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-lsr-sr-enhanced-vpn defines the IGP extensions to build a
   set of Segment Routing (SR) based VTNs.  This document describes a
   simplified mechanism to build the SR based VTNs using IS-IS Multi-
   Topology together with other well-defined IS-IS extensions.

Status of This Memo

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   This Internet-Draft will expire on April 16, 2021.

Xie, et al.              Expires April 16, 2021                 [Page 1]
Internet-Draft             IS-IS MT for SR VTN              October 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Advertisement of SR VTN Topology Attribute  . . . . . . . . .   3
   3.  Advertisement of SR VTN Resource Attribute  . . . . . . . . .   4
     3.1.  Advertising Topology-specific TE attributes . . . . . . .   4
   4.  Forwarding Plane Operations . . . . . . . . . . . . . . . . .   5
   5.  Scalability Considerations  . . . . . . . . . . . . . . . . .   5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   6
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

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 underlay and the overlay
   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 may be used for
   5G transport network slicing, and will also be of use in other
   generic scenarios.

   To meet the requirement of enhanced VPN services, a number of virtual
   transport networks (VTN) can be created, each with a subset of the
   underlay network topology and a subset of network resources allocated
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