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Requirements for Generalized MPLS (GMPLS) Signaling Usage and Extensions for Automatically Switched Optical Network (ASON)
RFC 4139

Network Working Group                                   D. Papadimitriou
Request for Comments: 4139                                       Alcatel
Category: Informational                                         J. Drake
                                                                  Boeing
                                                                  J. Ash
                                                                     ATT
                                                               A. Farrel
                                                      Old Dog Consulting
                                                                  L. Ong
                                                                   Ciena
                                                               July 2005

       Requirements for Generalized MPLS (GMPLS) Signaling Usage
   and Extensions for Automatically Switched Optical Network (ASON)

Status of This Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2005).

Abstract

   The Generalized Multi-Protocol Label Switching (GMPLS) suite of
   protocols has been defined to control different switching
   technologies and different applications.  These include support for
   requesting Time Division Multiplexing (TDM) connections, including
   Synchronous Optical Network (SONET)/Synchronous Digital Hierarchy
   (SDH) and Optical Transport Networks (OTNs).

   This document concentrates on the signaling aspects of the GMPLS
   suite of protocols.  It identifies the features to be covered by the
   GMPLS signaling protocol to support the capabilities of an
   Automatically Switched Optical Network (ASON).  This document
   provides a problem statement and additional requirements for the
   GMPLS signaling protocol to support the ASON functionality.

Papadimitriou, et al.        Informational                      [Page 1]
RFC 4139     GMPLS Signaling Usage and Extensions for ASON     July 2005

1.  Introduction

   The Generalized Multi-Protocol Label Switching (GMPLS) suite of
   protocol specifications provides support for controlling different
   switching technologies and different applications.  These include
   support for requesting Time Division Multiplexing (TDM) connections,
   including Synchronous Optical Network (SONET)/Synchronous Digital
   Hierarchy (SDH) (see [ANSI-T1.105] and [ITU-T-G.707], respectively),
   and Optical Transport Networks (see [ITU-T-G.709]).  In addition,
   there are certain capabilities needed to support Automatically
   Switched Optical Networks control planes (their architecture is
   defined in [ITU-T-G.8080]).  These include generic capabilities such
   as call and connection separation, along with more specific
   capabilities such as support of soft permanent connections.

   This document concentrates on requirements related to the signaling
   aspects of the GMPLS suite of protocols.  It discusses the functional
   requirements required to support Automatically Switched Optical
   Networks that may lead to additional extensions to GMPLS signaling
   (see [RFC3471] and [RFC3473]) to support these capabilities.  In
   addition to ASON signaling requirements, this document includes GMPLS
   signaling requirements that pertain to backward compatibility
   (Section 5).  A terminology section is provided in the Appendix.

2.  Conventions Used in This Document

   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].

   While [RFC2119] describes interpretations of these key words in terms
   of protocol specifications and implementations, they are used in this
   document to describe design requirements for protocol extensions.

3.  Problem Statement

   The Automatically Switched Optical Network (ASON) architecture
   describes the application of an automated control plane for
   supporting both call and connection management services (for a
   detailed description see [ITU-T-G.8080]).  The ASON architecture
   describes a reference architecture, (i.e., it describes functional
   components, abstract interfaces, and interactions).

   The ASON model distinguishes reference points (representing points of
   information exchange) defined (1) between a user (service requester)
   and a service provider control domain, a.k.a. user-network interface
   (UNI), (2) between control domains, a.k.a. external network-network
   interface (E-NNI), and, (3) within a control domain, a.k.a. internal

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