Transport of Layer 2 Frames Over MPLS
RFC 4906
| Document | Type |
RFC - Historic
(June 2007; Errata)
Was draft-martini-l2circuit-trans-mpls (individual in int area)
|
|
|---|---|---|---|
| Authors | Nasser El-Aawar , Luca Martini , Eric Rosen | ||
| 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 4906 (Historic) | |
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Mark Townsley | ||
| Send notices to | (None) | ||
Network Working Group L. Martini, Ed.
Request for Comments: 4906 E. Rosen, Ed.
Category: Historic Cisco Systems, Inc.
N. El-Aawar, Ed.
Level 3 Communications, LLC
June 2007
Transport of Layer 2 Frames Over MPLS
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.
Copyright Notice
Copyright (C) The IETF Trust (2007).
Abstract
This document describes methods for transporting the Protocol Data
Units (PDUs) of layer 2 protocols such as Frame Relay, Asynchronous
Transfer Mode (ATM) Adaption Layer 5 (AAL5), and Ethernet, and for
providing a Synchronized Optical Network (SONET) circuit emulation
service across an MPLS network. This document describes the so-
called "draft-martini" protocol, which has since been superseded by
the Pseudowire Emulation Edge to Edge Working Group specifications
described in RFC 4447 and related documents.
Martini, et al. Historic [Page 1]
RFC 4906 Transport of Layer 2 Frames Over MPLS June 2007
Table of Contents
1. Introduction ....................................................3
2. Specification of Requirements ...................................3
3. Special Note ....................................................3
4. Tunnel Labels and Virtual Circuit (VC) Labels ...................4
5. Protocol-Specific Details .......................................5
5.1. Frame Relay ................................................5
5.2. ATM ........................................................6
5.2.1. ATM AAL5 VCC Transport ..............................6
5.2.2. ATM Transparent Cell Transport ......................6
5.2.3. ATM VCC and VPC Cell Transport ......................6
5.2.4. OAM Cell Support ....................................6
5.2.5. ILMI Support ........................................7
5.3. Ethernet VLAN ..............................................7
5.4. Ethernet ...................................................8
5.5. HDLC .......................................................8
5.6. PPP ........................................................8
6. LDP .............................................................8
6.1. Interface Parameters Field ................................10
6.2. C Bit Handling Procedures .................................12
6.2.1. VC Types for Which the Control Word is REQUIRED ....12
6.2.2. VC Types for Which the Control Word is NOT
Mandatory ..........................................12
6.2.3. Status Codes .......................................15
6.3. LDP Label Withdrawal Procedures ...........................15
6.4. Sequencing Considerations .................................15
6.4.1. Label Mapping Advertisements .......................15
6.4.2. Label Mapping Release ..............................16
7. IANA Considerations ............................................16
8. Security Considerations ........................................16
9. Normative References ...........................................17
10. Informative References ........................................18
11. Co-Authors ....................................................18
Martini, et al. Historic [Page 2]
RFC 4906 Transport of Layer 2 Frames Over MPLS June 2007
1. Introduction
In an MPLS network, it is possible to carry the Protocol Data Units
(PDUs) of layer 2 protocols by prepending an MPLS label stack to
these PDUs. This document specifies the necessary label distribution
procedures for accomplishing this using the encapsulation methods in
[RFC4905]. We restrict discussion to the case of point-to-point
transport. Quality of service (QoS)-related issues are not discussed
in this document. This document describes methods for transporting a
number of protocols; in some cases, transporting a particular
protocol may have several modes of operation. Each of these
protocols and/or modes may be implemented independently.
An accompanying document [CEM] also describes a method for
transporting time division multiplexed (TDM) digital signals (TDM
circuit emulation) over a packet-oriented MPLS network. The
transmission system for circuit-oriented TDM signals is the
Synchronous Optical Network (SONET) [ANSI.T1.105] / Synchronous
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