Encapsulation Methods for Transport of Ethernet over MPLS Networks
RFC 4448
| Document | Type | RFC - Proposed Standard (April 2006; Errata) | |
|---|---|---|---|
| Authors | Luca Martini , Nasser El-Aawar , Eric Rosen , Giles Heron | ||
| Last updated | 2013-03-02 | ||
| Stream | Internent Engineering Task Force (IETF) | ||
| Formats | plain text html pdf htmlized (tools) htmlized bibtex | ||
| Stream | WG state | WG Document | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 4448 (Proposed Standard) | |
| Action Holders |
(None)
|
||
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Mark Townsley | ||
| Send notices to | stbryant@cisco.com, danny@tcb.net, lmartini@cisco.com | ||
Network Working Group L. Martini, Ed.
Request for Comments: 4448 E. Rosen
Category: Standards Track Cisco Systems, Inc.
N. El-Aawar
Level 3 Communications, LLC
G. Heron
Tellabs
April 2006
Encapsulation Methods for Transport of Ethernet over MPLS Networks
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 Internet Society (2006).
Abstract
An Ethernet pseudowire (PW) is used to carry Ethernet/802.3 Protocol
Data Units (PDUs) over an MPLS network. This enables service
providers to offer "emulated" Ethernet services over existing MPLS
networks. This document specifies the encapsulation of
Ethernet/802.3 PDUs within a pseudowire. It also specifies the
procedures for using a PW to provide a "point-to-point Ethernet"
service.
Martini, et al. Standards Track [Page 1]
RFC 4448 Encapsulation of Ethernet over MPLS April 2006
Table of Contents
1. Introduction ....................................................3
2. Specification of Requirements ...................................6
3. Applicability Statement .........................................6
4. Details Specific to Particular Emulated Services ................7
4.1. Ethernet Tagged Mode .......................................7
4.2. Ethernet Raw Mode ..........................................8
4.3. Ethernet-Specific Interface Parameter LDP Sub-TLV ..........8
4.4. Generic Procedures .........................................9
4.4.1. Raw Mode vs. Tagged Mode ............................9
4.4.2. MTU Management on the PE/CE Links ..................11
4.4.3. Frame Ordering .....................................11
4.4.4. Frame Error Processing .............................11
4.4.5. IEEE 802.3x Flow Control Interworking ..............11
4.5. Management ................................................12
4.6. The Control Word ..........................................12
4.7. QoS Considerations ........................................13
5. Security Considerations ........................................14
6. PSN MTU Requirements ...........................................14
7. Normative References ...........................................15
8. Informative References .........................................15
9. Significant Contributors .......................................17
Appendix A. Interoperability Guidelines ...........................20
A.1. Configuration Options .....................................20
A.2. IEEE 802.3x Flow Control Considerations ...................21
Appendix B. QoS Details ...........................................21
B.1. Adaptation of 802.1Q CoS to PSN CoS .......................22
B.2. Drop Precedence ...........................................23
Martini, et al. Standards Track [Page 2]
RFC 4448 Encapsulation of Ethernet over MPLS April 2006
1. Introduction
An Ethernet pseudowire (PW) allows Ethernet/802.3 [802.3] Protocol
Data Units (PDUs) to be carried over a Multi-Protocol Label Switched
[MPLS-ARCH] network. In addressing the issues associated with
carrying an Ethernet PDU over a packet switched network (PSN), this
document assumes that a pseudowire (PW) has been set up by using a
control protocol such as the one as described in [PWE3-CTRL]. The
design of Ethernet pseudowire described in this document conforms to
the pseudowire architecture described in [RFC3985]. It is also
assumed in the remainder of this document that the reader is familiar
with RFC 3985.
The Pseudowire Emulation Edge-to-Edge (PWE3) Ethernet PDU consists of
the Destination Address, Source Address, Length/Type, MAC Client
Data, and padding extracted from a MAC frame as a concatenated octet
sequence in their original order [PDU].
In addition to the Ethernet PDU format used within the pseudowire,
this document discusses:
- Procedures for using a PW in order to provide a pair of Customer
Edge (CE) routers with an emulated (point-to-point) Ethernet
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