Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual Transport Network
draft-xie-lsr-isis-sr-vtn-mt-00

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LSR Working Group                                                 C. Xie
Internet-Draft                                                     C. Ma
Intended status: Standards Track                           China Telecom
Expires: September 10, 2020                                      J. Dong
                                                                   Z. Li
                                                     Huawei Technologies
                                                           March 9, 2020

   Using IS-IS Multi-Topology (MT) for Segment Routing based Virtual
                           Transport Network
                    draft-xie-lsr-isis-sr-vtn-mt-00

Abstract

   Enhanced VPN (VPN+) as defined in I-D.ietf-teas-enhanced-vpn aims to
   provide enhanced VPN service to support some 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-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 IGP multi-
   topology together with other well-defined IS-IS extensions.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any

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Internet-Draft             IS-IS MT for SR VTN                March 2020

   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on September 10, 2020.

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   document authors.  All rights reserved.

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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
     3.2.  Associating VTNs with L2 Bundle Member Links  . . . . . .   4
   4.  Scalability Considerations  . . . . . . . . . . . . . . . . .   5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   5
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   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.  These
   properties cannot be met with pure overlay networks, as they 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

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