Pseudowire Setup and Maintenance Using the Label Distribution Protocol (LDP)
RFC 4447
Document | Type |
RFC - Proposed Standard
(April 2006; Errata)
Obsoleted by RFC 8077
|
|
---|---|---|---|
Authors | Toby Smith , Giles Heron , Eric Rosen , Nasser El-Aawar , Luca Martini | ||
Last updated | 2015-10-14 | ||
Stream | Internent Engineering Task Force (IETF) | ||
Formats | plain text html pdf htmlized (tools) htmlized bibtex | ||
Stream | WG state | (None) | |
Document shepherd | No shepherd assigned | ||
IESG | IESG state | RFC 4447 (Proposed Standard) | |
Action Holders |
(None)
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||
Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Mark Townsley | ||
Send notices to | danny@tcb.net, stbryant@cisco.com |
Network Working Group L. Martini, Ed. Request for Comments: 4447 E. Rosen Category: Standards Track Cisco Systems, Inc. N. El-Aawar Level 3 Communications, LLC. T. Smith Network Appliance, Inc. G. Heron Tellabs April 2006 Pseudowire Setup and Maintenance Using the Label Distribution Protocol (LDP) 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 Layer 2 services (such as Frame Relay, Asynchronous Transfer Mode, and Ethernet) can be "emulated" over an MPLS backbone by encapsulating the Layer 2 Protocol Data Units (PDU) and transmitting them over "pseudowires". It is also possible to use pseudowires to provide low-rate Time Division Multiplexed and a Synchronous Optical NETworking circuit emulation over an MPLS-enabled network. This document specifies a protocol for establishing and maintaining the pseudowires, using extensions to Label Distribution Protocol (LDP). Procedures for encapsulating Layer 2 PDUs are specified in a set of companion documents. Martini, et al. Standards Track [Page 1] RFC 4447 PWE3 Using LDP April 2006 Table of Contents 1. Introduction ....................................................3 2. Specification of Requirements ...................................5 3. The Pseudowire Label ............................................5 4. Details Specific to Particular Emulated Services ................7 4.1. IP Layer 2 Transport .......................................7 5. LDP .............................................................7 5.1. LDP Extensions .............................................8 5.2. The PWid FEC Element .......................................8 5.3. The Generalized PWid FEC Element ..........................10 5.3.1. Attachment Identifiers .............................11 5.3.2. Encoding the Generalized ID FEC Element ............13 5.3.2.1. Interface Parameters TLV ..................14 5.3.2.2. PW Grouping TLV ...........................14 5.3.3. Signaling Procedures ...............................15 5.4. Signaling of Pseudowire Status ............................16 5.4.1. Use of Label Mappings Messages .....................16 5.4.2. Signaling PW Status ................................17 5.4.3. Pseudowire Status Negotiation Procedures ...........18 5.5. Interface Parameters Sub-TLV ..............................19 6. Control Word ...................................................20 6.1. PW Types for Which the Control Word is REQUIRED ...........20 6.2. PW Types for Which the Control Word is NOT Mandatory ......21 6.3. LDP Label Withdrawal Procedures ...........................22 6.4. Sequencing Considerations .................................23 6.4.1. Label Advertisements ...............................23 6.4.2. Label Release ......................................24 7. IANA Considerations ............................................24 7.1. LDP TLV TYPE ..............................................24 7.2. LDP Status Codes ..........................................24 7.3. FEC Type Name Space .......................................25 8. Security Considerations ........................................25 8.1. Data-Plane Security .......................................25 8.2. Control-Plane Security ....................................26 9. Acknowledgements ...............................................27 10. Normative References ..........................................27 11. Informative References ........................................27 12. Additional Contributing Authors ...............................28 Appendix A. C-bit Handling Procedures Diagram .....................31 Martini, et al. Standards Track [Page 2] RFC 4447 PWE3 Using LDP April 2006Show full document text