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

• Status
• IESG evaluation record
• IESG writeups
• Email expansions
• History

• Versions
• 00
• 01

BESS WG                                                     Zheng. Zhang
Internet-Draft                                              Shaofu. Peng
Intended status: Standards Track                            Greg. Mirsky
Expires: July 6, 2020                                    ZTE Corporation
                                                         January 3, 2020

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

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   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 July 6, 2020.

Copyright Notice

   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
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Zhang, et al.             Expires July 6, 2020                  [Page 1]
Internet-Draft        BESS SPRING inter-domain VPN          January 2020

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.

Zhang, et al.             Expires July 6, 2020                  [Page 2]
Internet-Draft        BESS SPRING inter-domain VPN          January 2020

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

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