http://www.rfc-editor.org/rfc/rfc7319.txt
RFC 7319: IANA Considerations for Connectivity Fault Management (CFM) Code Points, D. Eastlake 3rd2014-07-01T23:00:00-00:00IEEE 802.1 has specified Connectivity Fault Management (CFM) Operations, Administration, and Maintenance (OAM) facilities. CFM messages are structured with an OpCode field and have provision for the inclusion of TLV-structured information. IEEE 802.1 has allocated blocks of CFM OpCodes and TLV Types to the IETF. This document specifies the IANA considerations for the assignment of values from these blocks.