Using Flex-Algo for Segment Routing based VTN
draft-zhu-lsr-isis-sr-vtn-flexalgo-00

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LSR Working Group                                                 Y. Zhu
Internet-Draft                                             China Telecom
Intended status: Standards Track                                 J. Dong
Expires: September 10, 2020                                        Z. Hu
                                                     Huawei Technologies
                                                           March 9, 2020

             Using Flex-Algo for Segment Routing based VTN
                 draft-zhu-lsr-isis-sr-vtn-flexalgo-00

Abstract

   As defined in I-D.ietf-teas-enhanced-vpn, enhanced VPN (VPN+) aims to
   provide enhanced VPN service to support the 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 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 mechanisms with
   necessary extensions to build a set of Segment Routing (SR) based
   VTNs.  This document describes a simplified mechanism to build the SR
   based VTNs using SR Flex-Algo with minor extensions to IGP L2 bundle.

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-Draft            Flex-Algo for SR VTN                March 2020

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

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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Advertisement of SR VTN Topology Attribute  . . . . . . . . .   3
   3.  Extensions to IGP L2 Bundles  . . . . . . . . . . . . . . . .   4
   4.  Scalability Considerations  . . . . . . . . . . . . . . . . .   5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   5
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     8.2.  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.  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
   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) need to be created, each with a subset of

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