Pseudowire Setup and Maintenance Using the Label Distribution Protocol (LDP) (RFC8077)
Original Publication Date: 2017-Feb-01
Included in the Prior Art Database: 2017-Feb-03
Internet Society Requests For Comment (RFCs)
L. Martini: AUTHOR [+4]
[RFC4619], [RFC4717], [RFC4618], and [RFC4448] explain how to encapsulate a Layer 2 Protocol Data Unit (PDU) for transmission over an MPLS-enabled network. Those documents specify that a "pseudowire header", consisting of a demultiplexer field, will be prepended to the encapsulated PDU. The pseudowire demultiplexer field is prepended before transmitting a packet on a pseudowire. When the packet arrives at the remote endpoint of the pseudowire, the demultiplexer is what enables the receiver to identify the particular pseudowire on which the packet has arrived. To transmit the packet from one pseudowire endpoint to another, the packet may need to travel through a "Packet Switched Network (PSN) tunnel"; this will require that an additional header be prepended to the packet.
Internet Engineering Task Force (IETF) L. Martini, Ed. Request for Comments: 8077 G. Heron, Ed. STD: 84 Cisco Obsoletes: 4447, 6723 February 2017 Category: Standards Track ISSN: 2070-1721
Pseudowire Setup and Maintenance Using the Label Distribution Protocol (LDP)
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 (PDUs) and then transmitting them over pseudowires (PWs). It is also possible to use pseudowires to provide low-rate Time-Division Multiplexed and Synchronous Optical NETworking circuit emulation over an MPLS-enabled network. This document specifies a protocol for establishing and maintaining the pseudowires, using extensions to the Label Distribution Protocol (LDP). Procedures for encapsulating Layer 2 PDUs are specified in other documents.
This document is a rewrite of RFC 4447 for publication as an Internet Standard.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc8077.
Heron Standards Track [Page 1]
RFC 8077 PWE3 Using LDP February 2017
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