Virtual Private Wire Service Support in Ethernet VPN
RFC 8214

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Internet Engineering Task Force (IETF)                        S. Boutros
Request for Comments: 8214                                        VMware
Category: Standards Track                                     A. Sajassi
ISSN: 2070-1721                                                 S. Salam
                                                                   Cisco
                                                                J. Drake
                                                        Juniper Networks
                                                              J. Rabadan
                                                                   Nokia
                                                             August 2017

          Virtual Private Wire Service Support in Ethernet VPN

Abstract

   This document describes how Ethernet VPN (EVPN) can be used to
   support the Virtual Private Wire Service (VPWS) in MPLS/IP networks.
   EVPN accomplishes the following for VPWS: provides Single-Active as
   well as All-Active multihoming with flow-based load-balancing,
   eliminates the need for Pseudowire (PW) signaling, and provides fast
   protection convergence upon node or link failure.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8214.

Boutros, et al.              Standards Track                    [Page 1]
RFC 8214                  VPWS Support in EVPN               August 2017

Copyright Notice

   Copyright (c) 2017 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.

Table of Contents

   1. Introduction ....................................................3
      1.1. Terminology ................................................5
   2. Service Interface ...............................................6
      2.1. VLAN-Based Service Interface ...............................6
      2.2. VLAN Bundle Service Interface ..............................7
           2.2.1. Port-Based Service Interface ........................7
      2.3. VLAN-Aware Bundle Service Interface ........................7
   3. BGP Extensions ..................................................7
      3.1. EVPN Layer 2 Attributes Extended Community .................8
   4. Operation ......................................................10
   5. EVPN Comparison to PW Signaling ................................11
   6. Failure Scenarios ..............................................12
      6.1. Single-Homed CEs ..........................................12
      6.2. Multihomed CEs ............................................12
   7. Security Considerations ........................................13
   8. IANA Considerations ............................................13
   9. References .....................................................13
      9.1. Normative References ......................................13
      9.2. Informative References ....................................14
   Acknowledgements ..................................................16
   Contributors ......................................................16
   Authors' Addresses ................................................17

Boutros, et al.              Standards Track                    [Page 2]
RFC 8214                  VPWS Support in EVPN               August 2017

1.  Introduction

   This document describes how EVPN can be used to support VPWS in
   MPLS/IP networks.  The use of EVPN mechanisms for VPWS (EVPN-VPWS)
   brings the benefits of EVPN to Point-to-Point (P2P) services.  These
   benefits include Single-Active redundancy as well as All-Active
   redundancy with flow-based load-balancing.  Furthermore, the use of
   EVPN for VPWS eliminates the need for the traditional way of PW
   signaling for P2P Ethernet services, as described in Section 4.

   [RFC7432] provides the ability to forward customer traffic to/from a