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MPLS Transport Profile (MPLS-TP) Next-Hop Ethernet Addressing
RFC 7213

Internet Engineering Task Force (IETF)                          D. Frost
Request for Comments: 7213                                      Blue Sun
Category: Standards Track                                      S. Bryant
ISSN: 2070-1721                                            Cisco Systems
                                                                M. Bocci
                                                          Alcatel-Lucent
                                                               June 2014

     MPLS Transport Profile (MPLS-TP) Next-Hop Ethernet Addressing

Abstract

   The MPLS Transport Profile (MPLS-TP) is the set of MPLS protocol
   functions applicable to the construction and operation of packet-
   switched transport networks.  This document presents considerations
   for link-layer addressing of Ethernet frames carrying MPLS-TP
   packets.

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 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7213.

Copyright Notice

   Copyright (c) 2014 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
   (http://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.

Frost, et al.                Standards Track                    [Page 1]
RFC 7213               MPLS-TP Ethernet Addressing             June 2014

1.  Introduction

   The MPLS Transport Profile (MPLS-TP) [RFC5921] is the set of protocol
   functions that meet the requirements [RFC5654] for the application of
   MPLS to the construction and operation of packet-switched transport
   networks.  The MPLS-TP data plane consists of those MPLS-TP functions
   concerned with the encapsulation and forwarding of MPLS-TP packets
   and is described in [RFC5960].

   This document presents considerations for link-layer addressing of
   Ethernet frames carrying MPLS-TP packets.  Since MPLS-TP packets are
   MPLS packets, existing procedures ([RFC3032], [RFC5332]) for the
   encapsulation of MPLS packets over Ethernet apply.  Because IP
   functionality is optional in an MPLS-TP network, IP-based protocols
   for Media Access Control (MAC) address learning, such as the Address
   Resolution Protocol (ARP) [RFC826] and IPv6 Neighbor Discovery
   [RFC4861], may not be available.  This document specifies the options
   for the determination and selection of the next-hop Ethernet MAC
   address when MPLS-TP is used between nodes that do not have an IP
   data plane.

1.1.  Terminology

   Term    Definition
   ------- ---------------------------
   ARP     Address Resolution Protocol
   G-ACh   Generic Associated Channel
   LSP     Label Switched Path
   LSR     Label Switching Router
   MAC     Media Access Control
   MPLS-TP MPLS Transport Profile

   Additional definitions and terminology can be found in [RFC5960] and
   [RFC5654].

1.2.  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 [RFC2119].

2.  Point-to-Point Link Addressing

   When two MPLS-TP nodes are connected by a point-to-point Ethernet
   link, the question arises as to what destination Ethernet Media
   Access Control (MAC) address should be specified in Ethernet frames
   transmitted to the peer node over the link.  The problem of
   determining this address does not arise in IP/MPLS networks because

Frost, et al.                Standards Track                    [Page 2]
RFC 7213               MPLS-TP Ethernet Addressing             June 2014

   of the presence of the Ethernet Address Resolution Protocol (commonly

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