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MPLS Transport Profile User-to-Network and Network-to-Network Interfaces
RFC 6215

Internet Engineering Task Force (IETF)                          M. Bocci
Request for Comments: 6215                                     L. Levrau
Updates: 5921                                             Alcatel-Lucent
Category: Informational                                         D. Frost
ISSN: 2070-1721                                                    Cisco
                                                              April 2011

                 MPLS Transport Profile User-to-Network
                   and Network-to-Network Interfaces

Abstract

   The framework for MPLS in transport networks (RFC 5921) provides
   reference models for the MPLS Transport Profile (MPLS-TP) Transport
   Service Interfaces, which are a User-to-Network Interface (UNI), and
   a Network-to-Network Interface (NNI).  This document updates those
   reference models to show detailed reference points for these
   interfaces, along with further clarification of the functional
   architecture of MPLS-TP at a UNI and NNI.

   This document is a product of a joint Internet Engineering Task Force
   (IETF) / International Telecommunication Union Telecommunication
   Standardization Sector (ITU-T) effort to include an MPLS Transport
   Profile within the IETF MPLS and Pseudowire Emulation Edge-to-Edge
   (PWE3) architectures to support the capabilities and functionalities
   of a packet transport network as defined by the ITU-T.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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).  Not all documents
   approved by the IESG are a candidate for any level of Internet
   Standard; see 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/rfc6215.

Bocci, et al.                 Informational                     [Page 1]
RFC 6215                   MPLS-TP UNI and NNI                April 2011

Copyright Notice

   Copyright (c) 2011 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.

1.  Introduction

   The framework for MPLS in transport networks [RFC5921] provides
   reference models for the MPLS Transport Profile (MPLS-TP) Transport
   Service Interfaces, which are a User-to-Network Interface (UNI) and a
   Network-to-Network Interface (NNI).  This document updates those
   reference models to show detailed reference points for these
   interfaces, along with further clarification of the functional
   architecture of MPLS-TP at a UNI and NNI.

   This document is a product of a joint Internet Engineering Task Force
   (IETF) / International Telecommunication Union Telecommunication
   Standardization Sector (ITU-T) effort to include an MPLS Transport
   Profile within the IETF MPLS and PWE3 architectures to support the
   capabilities and functionalities of a packet transport network as
   defined by the ITU-T.

1.1.  Updates to the MPLS-TP UNI and NNI

   The Transport Service Interfaces for MPLS-TP are defined in Section
   3.4.3 of [RFC5921].  These definitions are illustrated by showing
   MPLS-TP Provider Edges (PEs) containing a UNI and an NNI.  The
   figures illustrate the UNI and the NNI as a span.  However, it is
   convention to illustrate these interfaces as reference points.
   Furthermore, in the case of a UNI, it is useful to illustrate the
   distribution of UNI functions between the Customer Edge (CE) side and
   the PE side of the UNI, i.e., the UNI-C (User-to-User Interface,
   Client side) and UNI-N (User-to-Network Interface, Network side), in
   order to show their relationship to one another.

Bocci, et al.                 Informational                     [Page 2]
RFC 6215                   MPLS-TP UNI and NNI                April 2011

   This document provides updated illustrations of the MPLS-TP UNI and
   MPLS-TP NNI to show these additional details.  These illustrations

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