SRv6 and MPLS interworking for VPN service
draft-pzm-spring-interdomain-vpn-01

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BESS WG                                                     Zheng. Zhang
Internet-Draft                                              Shaofu. Peng
Intended status: Standards Track                            Greg. Mirsky
Expires: July 12, 2020                                   ZTE Corporation
                                                         January 9, 2020

               SRv6 and MPLS interworking for VPN service
                  draft-pzm-spring-interdomain-vpn-01

Abstract

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

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   This Internet-Draft will expire on July 12, 2020.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Specification . . . . . . . . . . . . . . . . . . . . . . . .   2
     2.1.  SRv6 to SR-MPLS domain signaling  . . . . . . . . . . . .   2
     2.2.  SR-MPLS to SRv6 domain signaling  . . . . . . . . . . . .   3
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   5.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     5.1.  Normative References  . . . . . . . . . . . . . . . . . .   4
     5.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

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.  Specification

2.1.  SRv6 to SR-MPLS domain signaling

   [I-D.ietf-bess-srv6-services] defines the new TLVs for the BGP
   Prefix-SID Attribute that can be used to signaling of SRv6 SID for L3
   and L2 services.  In this document, we use L3 case as the example,
   the procedures for L2 are the same as in L3 scenario.

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                   +-------------+         +-------------+
                   |    AS1      |         |     AS2     |
                   |             |         |             |
         CE1+----+PE1          ASBR1+---+ASBR2          PE2+----+CE2
                   |             |         |             |
                   |    SRV6     |         |   SR-MPLS   |
                   +-------------+         +-------------+
                          Figure 1

   For example, CE1 and CE2 are connected through a backbone that