SRv6 and MPLS interworking for VPN service
draft-pzm-spring-interdomain-vpn-02

Document Type Active Internet-Draft (individual)
Authors Zheng Zhang  , Shaofu Peng  , Greg Mirsky  , Yubao Wang 
Last updated 2020-08-13
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BESS WG                                                         Z. Zhang
Internet-Draft                                                   S. Peng
Intended status: Standards Track                               G. Mirsky
Expires: February 14, 2021                                       Y. Wang
                                                         ZTE Corporation
                                                         August 13, 2020

               SRv6 and MPLS interworking for VPN service
                  draft-pzm-spring-interdomain-vpn-02

Abstract

   This document describes a method to achieve an inter-domain
   connection for a VPN (Virtual Private Network) service.

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
   Task Force (IETF).  Note that other groups may also distribute
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   This Internet-Draft will expire on February 14, 2021.

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   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   2
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   2
     2.2.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   3.  Theory of operation . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  SRv6 to SR-MPLS domain signaling  . . . . . . . . . . . .   3
     3.2.  SR-MPLS to SRv6 domain signaling  . . . . . . . . . . . .   4
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   [I-D.agrawal-spring-srv6-mpls-interworking] describes SRv6 and MPLS/
   SR-MPLS interworking and co-existence procedures.  The document
   leverages the function defined in
   [I-D.ietf-spring-srv6-network-programming] to give guidance to the
   forwarding in routers.

   [RFC4364] describes a method by which a Service Provider may use an
   IP backbone to provide IP Virtual Private Networks (VPNs) for its
   customers.  When SRv6 and SR-MPLS are co-existed in the backbone,
   controller or a control plane, for example, using BGP, should be used
   to instantiate the VPN service as described in
   [I-D.agrawal-spring-srv6-mpls-interworking].

   In case of option B inter-domain interconnection [RFC4364], only ASBR
   needs to do the stitching work between two ASes.  Thus PEs in SRv6
   and SR-MPLS domains do not have to support both SRv6 and SR-MPLS
   functions.  This document discusses the use of BGP for achieving VPN
   service through option B defined in [RFC4364] across a backbone that
   includes SRv6 and SR-MPLS domains.

2.  Conventions used in this document

2.1.  Terminology

   ASBR - Autonomous System Boundary Router

   PE - Provider's Equipment

   AS - Autonomous System

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   SR - Segment Routing

   SRv6 - Segment Routing over IPv6 data plane

   SR-MPLS - Segment Routing over MPLS data plane

   SID - Segment Identifier

   IMET - Inclusive Multicast Ethernet Tag

2.2.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
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