A method of fault monitoring in a fault monitoring entity of a network node of a network having at least a first connection-oriented network layer (OTN 22), having first network layer protection measures (40a, 40b) associated therewith, and a second connection-oriented network layer (MPLS-TP 26) having second network layer protection measures (42a, 42b) associated therewith, at least part of a working path of the second connection-oriented network layer (MPLS-TP 26, MPLS-TP 28) being carried by the first connection-oriented network layer (OTN 22) and routed through the network node, comprising the step of: monitoring a service condition status of the first connection-oriented network layer (OTN 22) terminating at the network node using first network layer protection measures (40a, 40b) received at the network node within the first connection-oriented network layer (OTN 22); determining second network layer protection measures (46, 44) for onward transmission from the network node within the second connection-oriented network layer (MPLS-TP 28) depending on the monitored service condition status of the first connection-oriented network layer (OTN 22), the method further characterized by: in the step of determining second network layer protection measures (44, 46), a switch-inhibiting second network layer protection message (44, 46), which inhibits switching of the working path of the second connection-oriented network layer, is determined for onward transmission within the second connection-oriented network layer if the step of monitoring the service condition status of the first connection-oriented network layer (OTN 22) indicates that the first connection-oriented network layer (OTN 22) has a fault recoverable by the first connection-oriented network layer (OTN 22). monitoring a service condition status of the first connection-oriented network layer (OTN 22) terminating at the network node using first network layer protection measures (40a, 40b) received at the network node within the first connection-oriented network layer (OTN 22); determining second network layer protection measures (46, 44) for onward transmission from the network node within the second connection-oriented network layer (MPLS-TP 28) depending on the monitored service condition status of the first connection-oriented network layer (OTN 22), the method further characterized by: in the step of determining second network layer protection measures (44, 46), a switch-inhibiting second network layer protection message (44, 46), which inhibits switching of the working path of the second connection-oriented network layer, is determined for onward transmission within the second connection-oriented network layer if the step of monitoring the service condition status of the first connection-oriented network layer (OTN 22) indicates that the first connection-oriented network layer (OTN 22) has a fault recoverable by the first connection-oriented network layer (OTN 22). in the step of determining second network layer protection measures (44, 46), a switch-inhibiting second network layer protection message (44, 46), which inhibits switching of the working path of the second connection-oriented network layer, is determined for onward transmission within the second connection-oriented network layer if the step of monitoring the service condition status of the first connection-oriented network layer (OTN 22) indicates that the first connection-oriented network layer (OTN 22) has a fault recoverable by the first connection-oriented network layer (OTN 22).