http://www.rfc-editor.org/rfc/rfc6941.txt
RFC 6941: MPLS Transport Profile (MPLS-TP) Security Framework, L. Fang, B. Niven-Jenkins, S. Mansfield, R. Graveman2013-04-01T23:00:00-00:00This document is a product of a joint Internet Engineering Task Force (IETF) / International Telecommunication Union Telecommunication Standardization Sector (ITU-T) effort to include an MPLS Transport Profile within the IETF MPLS and Pseudowire Emulation Edge-to-Edge (PWE3) architectures to support the capabilities and functionality of a packet transport network.