Synchronous Optical Network/Synchronous Digital Hierarchy (SONET/SDH) Circuit Emulation Service over MPLS (CEM) Encapsulation
RFC 5143

 
Document
Type RFC - Historic (February 2008; No errata)
Obsoleted by RFC 4842
Last updated 2013-03-02
Stream ISE
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ISE state (None)
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IESG
IESG state RFC 5143 (Historic)
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Responsible AD Mark Townsley
Send notices to andrew.g.malis@verizon.com

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Network Working Group                                           A. Malis
Request for Comments: 5143                        Verizon Communications
Obsoleted by: 4842                                            J. Brayley
Category: Historic                                            J. Shirron
                                                        ECI Telecom Inc.
                                                              L. Martini
                                                     Cisco Systems, Inc.
                                                            S. Vogelsang
                                                          Alcatel-Lucent
                                                           February 2008

 Synchronous Optical Network/Synchronous Digital Hierarchy (SONET/SDH)
       Circuit Emulation Service over MPLS (CEM) Encapsulation

Status of This Memo

   This memo defines a Historic Document for the Internet community.  It
   does not specify an Internet standard of any kind.  Distribution of
   this memo is unlimited.

IESG Note

   The IESG thinks that this work is related to IETF work done in WG
   PWE3, but this does not prevent publishing.

Abstract

   This document describes a historical method for encapsulating
   Synchronous Optical Network/Synchronous Digital Hierarchy (SONET/SDH)
   Path signals for transport across packet-switched networks (PSNs).
   The PSNs explicitly supported by this document include MPLS and IP.
   Note that RFC 4842 describes the standards-track protocol for this
   functionality, and new implementations must use RFC 4842 rather than
   this document except when interoperability with older implementations
   is desired.

Malis, et al.                   Historic                        [Page 1]
RFC 5143         SONET/SDH Circuit Emulation over MPLS     February 2008

Table of Contents

   1. Introduction ....................................................3
   2. Conventions Used in This Document ...............................3
   3. Scope ...........................................................3
   4. CEM Encapsulation Format ........................................4
      4.1. Transport Encapsulation ....................................6
           4.1.1. MPLS Transport ......................................6
           4.1.2. IP Transport ........................................7
   5. CEM Operation ...................................................8
      5.1. Introduction and Terminology ...............................8
           5.1.1. CEM Packetizer and De-Packetizer ....................9
           5.1.2. CEM DBA .............................................9
      5.2. Description of Normal CEM Operation .......................10
      5.3. Description of CEM Operation during DBA ...................10
      5.4. Packet Synchronization ....................................11
           5.4.1. Acquisition of Packet Synchronization ..............11
           5.4.2. Loss of Packet Synchronization .....................11
   6. SONET/SDH Maintenance Signals ..................................12
      6.1. SONET/SDH to PSN ..........................................12
           6.1.1. AIS-P Indication ...................................13
           6.1.2. STS SPE Unequipped Indication ......................14
           6.1.3. CEM-RDI ............................................14
      6.2. PSN to SONET/SDH ..........................................15
           6.2.1. AIS-P Indication ...................................15
           6.2.2. STS SPE Unequipped Indication ......................15
   7. Clocking Modes .................................................16
      7.1. Synchronous ...............................................16
           7.1.1. Synchronous Unstructured CEM .......................16
           7.1.2. Synchronous Structured CEM .........................16
      7.2. Asynchronous ..............................................17
   8. CEM LSP Signaling ..............................................17
   9. Security Considerations ........................................18
   10. IANA Considerations ...........................................18
   11. References ....................................................18
      11.1. Normative References .....................................18
      11.2. Informative References ...................................19
   Appendix A. SONET/SDH Rates and Formats ...........................20
   Appendix B. ECC-6 Definition ......................................21

Malis, et al.                   Historic                        [Page 2]
RFC 5143         SONET/SDH Circuit Emulation over MPLS     February 2008

1.  Introduction

   This document describes a historical method for encapsulating
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