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)
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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 This document describes the so- called "draft-martini" protocol, which has since been superseded by the Pseudowire Emulation Edge to Edge Working Group specifications described in RFC 4447 and related documents.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] / SynchronousShow full document text