Synchronous Optical Network/Synchronous Digital Hierarchy (SONET/SDH) Circuit Emulation over Packet (CEP)
RFC 4842
Document | Type |
RFC - Proposed Standard
(April 2007; Errata)
Obsoletes RFC 5143
Was draft-ietf-pwe3-sonet (pwe3 WG)
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Authors | Prayson Pate , David Zelig , Ron Cohen , Andy Malis | ||
Last updated | 2020-01-21 | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized with errata bibtex | ||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 4842 (Proposed Standard) | |
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Mark Townsley | ||
Send notices to | (None) |
Network Working Group A. Malis Request for Comments: 4842 Verizon Communications Category: Standards Track P. Pate Overture Networks R. Cohen, Ed. Resolute Networks D. Zelig Corrigent Systems April 2007 Synchronous Optical Network/Synchronous Digital Hierarchy (SONET/SDH) Circuit Emulation over Packet (CEP) Status of This Memo This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited. Copyright Notice Copyright (C) The IETF Trust (2007). Abstract This document provides encapsulation formats and semantics for emulating Synchronous Optical Network/Synchronous Digital Hierarchy (SONET/SDH) circuits and services over MPLS. Malis, et al. Standards Track [Page 1] RFC 4842 SONET/SDH Circuit Emulation April 2007 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3. Requirements Notation . . . . . . . . . . . . . . . . . . . . 4 4. Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 5. CEP Encapsulation Format . . . . . . . . . . . . . . . . . . . 5 5.1. SONET/SDH Fragment . . . . . . . . . . . . . . . . . . . . 6 5.2. CEP Header . . . . . . . . . . . . . . . . . . . . . . . . 7 5.3. RTP Header . . . . . . . . . . . . . . . . . . . . . . . . 9 5.4. PSN Encapsulation . . . . . . . . . . . . . . . . . . . . 11 6. CEP Operation . . . . . . . . . . . . . . . . . . . . . . . . 11 6.1. CEP Packetizer and De-Packetizer . . . . . . . . . . . . . 11 6.2. Packet Synchronization . . . . . . . . . . . . . . . . . . 12 6.2.1. Acquisition of Packet Synchronization . . . . . . . . 13 6.2.2. Loss of Packet Synchronization . . . . . . . . . . . . 13 7. SONET/SDH Maintenance Signals . . . . . . . . . . . . . . . . 13 7.1. SONET/SDH to PSN . . . . . . . . . . . . . . . . . . . . . 13 7.1.1. CEP-AIS: AIS-P/V Indication . . . . . . . . . . . . . 13 7.1.2. Unequipped Indication . . . . . . . . . . . . . . . . 14 7.1.3. CEP-RDI: Remote Defect Indication . . . . . . . . . . 15 7.2. PSN to SONET/SDH . . . . . . . . . . . . . . . . . . . . . 15 7.2.1. CEP-AIS: AIS-P/V Indication . . . . . . . . . . . . . 15 7.2.2. Unequipped Indication . . . . . . . . . . . . . . . . 16 8. SONET/SDH Transport Timing . . . . . . . . . . . . . . . . . . 16 9. SONET/SDH Pointer Management . . . . . . . . . . . . . . . . . 17 9.1. Explicit Pointer Adjustment Relay (EPAR) . . . . . . . . . 17 9.2. Adaptive Pointer Management (APM) . . . . . . . . . . . . 19 10. CEP Performance Monitors . . . . . . . . . . . . . . . . . . . 19 10.1. Near-End Performance Monitors . . . . . . . . . . . . . . 19 10.2. Far-End Performance Monitors . . . . . . . . . . . . . . . 20 11. Payload Compression Options . . . . . . . . . . . . . . . . . 20 11.1. Dynamic Bandwidth Allocation . . . . . . . . . . . . . . . 21 11.2. Service-Specific Payload Formats . . . . . . . . . . . . . 21 11.2.1. Fractional STS-1 (VC-3) Encapsulation . . . . . . . . 21 11.2.1.1. Fractional STS-1 CEP Header . . . . . . . . . . . 23 11.2.1.2. B3 Compensation . . . . . . . . . . . . . . . . . 24 11.2.1.3. Actual Payload Size . . . . . . . . . . . . . . . 24 11.2.2. Asynchronous T3/E3 STS-1 (VC-3) Encapsulation . . . . 25 11.2.2.1. T3 Payload Compression . . . . . . . . . . . . . 25 11.2.2.2. E3 Payload Compression . . . . . . . . . . . . . 26 11.2.3. Fractional VC-4 Encapsulation . . . . . . . . . . . . 26 11.2.3.1. Fractional VC-4 Mapping . . . . . . . . . . . . . 27 11.2.3.2. Fractional VC-4 CEP Header . . . . . . . . . . . 28 11.2.3.3. B3 Compensation . . . . . . . . . . . . . . . . . 29 11.2.3.4. Actual Payload Sizes . . . . . . . . . . . . . . 30 12. Signaling of CEP Pseudowires . . . . . . . . . . . . . . . . . 30 12.1. CEP/TDM Payload Bytes . . . . . . . . . . . . . . . . . . 31 Malis, et al. Standards Track [Page 2]Show full document text