Pseudo Wire Emulation Edge-to-Edge (PWE3) Architecture
RFC 3985
| Document | Type |
RFC - Informational
(March 2005; No errata)
Updated by RFC 5462
Was draft-ietf-pwe3-arch (pwe3 WG)
|
|
|---|---|---|---|
| Authors | Prayson Pate , Stewart Bryant | ||
| Last updated | 2015-10-14 | ||
| Stream | IETF | ||
| Formats | plain text html pdf htmlized bibtex | ||
| Stream | WG state | (None) | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 3985 (Informational) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Jon Peterson | ||
| Send notices to | <danny@tcb.net> | ||
Network Working Group S. Bryant, Ed.
Request for Comments: 3985 Cisco Systems
Category: Informational P. Pate, Ed.
Overture Networks, Inc.
March 2005
Pseudo Wire Emulation Edge-to-Edge (PWE3) Architecture
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
This document describes an architecture for Pseudo Wire Emulation
Edge-to-Edge (PWE3). It discusses the emulation of services such as
Frame Relay, ATM, Ethernet, TDM, and SONET/SDH over packet switched
networks (PSNs) using IP or MPLS. It presents the architectural
framework for pseudo wires (PWs), defines terminology, and specifies
the various protocol elements and their functions.
Table of Contents
1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Pseudo Wire Definition. . . . . . . . . . . . . . . . . 2
1.2. PW Service Functionality. . . . . . . . . . . . . . . . 3
1.3. Non-Goals of This Document. . . . . . . . . . . . . . . 4
1.4. Terminology . . . . . . . . . . . . . . . . . . . . . . 4
2. PWE3 Applicability. . . . . . . . . . . . . . . . . . . . . . 6
3. Protocol Layering Model . . . . . . . . . . . . . . . . . . . 6
3.1. Protocol Layers . . . . . . . . . . . . . . . . . . . . 7
3.2. Domain of PWE3. . . . . . . . . . . . . . . . . . . . . 8
3.3. Payload Types . . . . . . . . . . . . . . . . . . . . . 8
4. Architecture of Pseudo Wires. . . . . . . . . . . . . . . . . 11
4.1. Network Reference Model . . . . . . . . . . . . . . . . 12
4.2. PWE3 Pre-processing . . . . . . . . . . . . . . . . . . 12
4.3. Maintenance Reference Model . . . . . . . . . . . . . . 16
4.4. Protocol Stack Reference Model. . . . . . . . . . . . . 17
4.5. Pre-processing Extension to Protocol Stack Reference
Model . . . . . . . . . . . . . . . . . . . . . . . . . 17
5. PW Encapsulation. . . . . . . . . . . . . . . . . . . . . . . 18
Bryant & Pate Standards Track [Page 1]
RFC 3985 PWE3 Architecture March 2005
5.1. Payload Convergence Layer . . . . . . . . . . . . . . . 19
5.2. Payload-independent PW Encapsulation Layers . . . . . . 21
5.3. Fragmentation . . . . . . . . . . . . . . . . . . . . . 24
5.4. Instantiation of the Protocol Layers. . . . . . . . . . 24
6. PW Demultiplexer Layer and PSN Requirements . . . . . . . . . 27
6.1. Multiplexing. . . . . . . . . . . . . . . . . . . . . . 27
6.2. Fragmentation . . . . . . . . . . . . . . . . . . . . . 28
6.3. Length and Delivery . . . . . . . . . . . . . . . . . . 28
6.4. PW-PDU Validation . . . . . . . . . . . . . . . . . . . 28
6.5. Congestion Considerations . . . . . . . . . . . . . . . 28
7. Control Plane . . . . . . . . . . . . . . . . . . . . . . . . 29
7.1. Set-up or Teardown of Pseudo Wires. . . . . . . . . . . 29
7.2. Status Monitoring . . . . . . . . . . . . . . . . . . . 30
7.3. Notification of Pseudo Wire Status Changes. . . . . . . 30
7.4. Keep-alive. . . . . . . . . . . . . . . . . . . . . . . 31
7.5. Handling Control Messages of the Native Services. . . . 32
8. Management and Monitoring . . . . . . . . . . . . . . . . . . 32
8.1. Status and Statistics . . . . . . . . . . . . . . . . . 32
8.2. PW SNMP MIB Architecture. . . . . . . . . . . . . . . . 33
8.3. Connection Verification and Traceroute. . . . . . . . . 36
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 37
10. Security Considerations . . . . . . . . . . . . . . . . . . . 37
11. Acknowledgements. . . . . . . . . . . . . . . . . . . . . . . 38
12. References. . . . . . . . . . . . . . . . . . . . . . . . . . 38
12.1. Normative References . . . . . . . . . . . . . . . . . 38
12.2. Informative References . . . . . . . . . . . . . . . . 39
13. Co-Authors. . . . . . . . . . . . . . . . . . . . . . . . . . 40
14. Editors' Addresses. . . . . . . . . . . . . . . . . . . . . . 41
Full Copyright Statement. . . . . . . . . . . . . . . . . . . 42
1. Introduction
This document describes an architecture for Pseudo Wire Emulation
Edge-to-Edge (PWE3) in support of [RFC3916]. It discusses the
emulation of services such as Frame Relay, ATM, Ethernet, TDM, and
SONET/SDH over packet switched networks (PSNs) using IP or MPLS. It
presents the architectural framework for pseudo wires (PWs), defines
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