Segment Routing for Enhanced VPN Service
draft-dong-spring-sr-for-enhanced-vpn-05

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Last updated 2019-10-16
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SPRING Working Group                                             J. Dong
Internet-Draft                                       Huawei Technologies
Intended status: Standards Track                               S. Bryant
Expires: April 18, 2020                           Futurewei Technologies
                                                             T. Miyasaka
                                                        KDDI Corporation
                                                                  Y. Zhu
                                                           China Telecom
                                                                  F. Qin
                                                                   Z. Li
                                                            China Mobile
                                                        October 16, 2019

                Segment Routing for Enhanced VPN Service
                draft-dong-spring-sr-for-enhanced-vpn-05

Abstract

   Enhanced VPN (VPN+) is an enhancement to VPN services to enable it to
   support the needs of new applications, particularly applications that
   are associated with 5G services.  These applications require better
   isolation from both control and data plane's perspective and have
   more stringent performance requirements than can be provided with
   overlay VPNs.  The characteristics of an enhanced VPN as perceived by
   its tenant needs to be comparable to those of a dedicated private
   network.  This requires tight integration between the overlay VPN and
   the underlay network topology and resources in a scalable manner.  An
   enhanced VPN may form the underpinning of 5G network slicing, but
   will also be of use in its own right.  This document describes how to
   use segment routing based mechanisms to provide the enhanced VPN
   service with the required network topology and resources.  The
   overall mechanism of providing segment routing based enhanced VPN
   service is also described.  The proposed mechanism is applicable to
   both segment routing with MPLS data plane (SR-MPLS) and segment
   routing with IPv6 data plane (SRv6).

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.

Dong, et al.             Expires April 18, 2020                 [Page 1]
Internet-Draft                 SR for VPN+                  October 2019

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   This Internet-Draft will expire on April 18, 2020.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Segment Routing with Topology and Resource Awareness  . . . .   4
     2.1.  SR-MPLS . . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.2.  SRv6  . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   3.  Control Plane Considerations  . . . . . . . . . . . . . . . .   7
   4.  Procedures  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     4.1.  Virtual Network Topology and Resource Computation . . . .   8
     4.2.  Network Resource and SID Allocation . . . . . . . . . . .   9
     4.3.  Construction of SR Virtual Networks . . . . . . . . . . .  11
     4.4.  VPN Service to SR Virtual Network Mapping . . . . . . . .  12
     4.5.  Virtual Network Visibility to Customer  . . . . . . . . .  13
   5.  Benefits of the Proposed Mechanism  . . . . . . . . . . . . .  13
   6.  Service Assurance . . . . . . . . . . . . . . . . . . . . . .  14
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
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