http://www.rfc-editor.org/rfc/rfc4448.txt
RFC 4448: Encapsulation Methods for Transport of Ethernet over MPLS Networks, L. Martini, E. Rosen, N. El-Aawar, G. Heron2006-04-01T23:00:00-00:00An Ethernet pseudowire (PW) is used to carry Ethernet/802.3 Protocol Data Units (PDUs) over an MPLS network. This enables service providers to offer "emulated" Ethernet services over existing MPLS networks. This document specifies the encapsulation of Ethernet/802.3 PDUs within a pseudowire. It also specifies the procedures for using a PW to provide a "point-to-point Ethernet" service. [STANDARDS-TRACK]