http://www.rfc-editor.org/rfc/rfc6671.txt
RFC 6671: Allocation of a Generic Associated Channel Type for ITU-T MPLS Transport Profile Operation, Maintenance, and Administration (MPLS-TP OAM), M. Betts2012-11-01T23:00:00-00:00This document assigns a Generic Associated Channel (G-ACh) Type for carrying ITU-T MPLS Transport Profile Operations, Administration, and Management (MPLS-TP OAM) messages in the MPLS Generic Associated Channel. This document is not an Internet Standards Track specification; it is published for informational purposes.