LSP-Ping and BFD encapsulation over ACH

LSP-Ping and BFD for MPLS are existing and widely deployment OAM mechanisms for MPLS LSPs. This document describes how LSP-Ping and BFD for MPLS can be used to perform OAM on MPLS-TP LSPs. This document describes extensions to LSP-Ping when IP addressing is not in use, in a MPLS-TP deployment scenario. These extensions are also meant to be applicable when it is desirable to avoid the use of IP encapsulation for exchanging LSP-Ping OAM messages. This document also clarifies the use of BFD for MPLS-TP LSPs when IP addressing may not be available and/or it may not be desirable to encapsulate BFD packets in IP.