Value,Meaning,Reference
0x0000,No return code,[RFC7110]
0x0001,Malformed Reply Path TLV was received,[RFC7110]
0x0002,One or more of the sub-TLVs in the Reply Path TLV were not understood,[RFC7110]
0x0003,The echo reply was sent successfully using the specified Reply Path,[RFC7110]
0x0004,"The specified Reply Path was not found, the echo reply was sent via other LSP",[RFC7110]
0x0005,"The specified Reply Path was not found, the echo reply was sent via pure IP forwarding (non-MPLS) path",[RFC7110]
0x0006,Use Reply Path TLV from this echo reply for building the next echo request,[RFC9716]
0x0007,Local policy does not allow dynamic return path building,[RFC9716]
0x0008-0xFFFB,Unassigned,[RFC7110]
0xFFFC-0xFFFF,Reserved for Experimental Use,[RFC7110]