RFC 8077
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) 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 (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…