An Architecture for Multi-Segment Pseudowire Emulation Edge-to-Edge
RFC 5659
Network Working Group M. Bocci
Request for Comments: 5659 Alcatel-Lucent
Category: Informational S. Bryant
Cisco Systems
October 2009
An Architecture for Multi-Segment Pseudowire Emulation Edge-to-Edge
Abstract
This document describes an architecture for extending pseudowire
emulation across multiple packet switched network (PSN) segments.
Scenarios are discussed where each segment of a given edge-to-edge
emulated service spans a different provider's PSN, as are other
scenarios where the emulated service originates and terminates on the
same provider's PSN, but may pass through several PSN tunnel segments
in that PSN. It presents an architectural framework for such multi-
segment pseudowires, defines terminology, and specifies the various
protocol elements and their functions.
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.
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Bocci & Bryant Informational [Page 1]
RFC 5659 Multi-Segment PWE3 Architecture October 2009
Table of Contents
1. Introduction ....................................................3
1.1. Motivation and Context .....................................3
1.2. Non-Goals of This Document .................................6
1.3. Terminology ................................................6
2. Applicability ...................................................8
3. Protocol Layering Model .........................................8
3.1. Domain of MS-PW Solutions ..................................9
3.2. Payload Types ..............................................9
4. Multi-Segment Pseudowire Reference Model ........................9
4.1. Intra-Provider Connectivity Architecture ..................11
4.1.1. Intra-Provider Switching Using ACs .................11
4.1.2. Intra-Provider Switching Using PWs .................11
4.2. Inter-Provider Connectivity Architecture ..................11
4.2.1. Inter-Provider Switching Using ACs .................12
4.2.2. Inter-Provider Switching Using PWs .................12
5. PE Reference Model .............................................13
5.1. Pseudowire Pre-Processing .................................13
5.1.1. Forwarding .........................................13
5.1.2. Native Service Processing ..........................14
6. Protocol Stack Reference Model .................................14
7. Maintenance Reference Model ....................................15
8. PW Demultiplexer Layer and PSN Requirements ....................16
8.1. Multiplexing ..............................................16
8.2. Fragmentation .............................................17
9. Control Plane ..................................................17
9.1. Setup and Placement of MS-PWs .............................17
9.2. Pseudowire Up/Down Notification ...........................18
9.3. Misconnection and Payload Type Mismatch ...................18
10. Management and Monitoring .....................................18
11. Congestion Considerations .....................................19
12. Security Considerations .......................................20
13. Acknowledgments ...............................................23
14. References ....................................................23
14.1. Normative References .....................................23
14.2. Informative References ...................................23
Bocci & Bryant Informational [Page 2]
RFC 5659 Multi-Segment PWE3 Architecture October 2009
1. Introduction
RFC 3985 [1] defines the architecture for pseudowires, where a
pseudowire (PW) both originates and terminates on the edge of the
same packet switched network (PSN). The PW label is unchanged
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