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)
Last updated 2013-03-02
Stream IETF
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Stream WG state (None)
Consensus Unknown
Document shepherd No shepherd assigned
IESG IESG state RFC 4906 (Historic)
Telechat date
Responsible AD Mark Townsley
Send notices to lmartini@cisco.com
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   called "draft-martini" protocol, which has since been superseded by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
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