Deterministic networking operations administration and maintenance for deterministic network service sub-layer

A method performed by a relay node of a deterministic network, DetNet, for providing operation, administration, and maintenance, OAM, for the DetNet, the method comprising:

• receiving, via a communication path used by a data flow, a first OAM message comprising an indication of a target node;
• responsive to receiving the first OAM message, determining whether the relay node is the target node;
• and
• when the relay node is not the target node,
• performing, based on determination of a function that the relay node is configured to perform, a packet elimination function, PEF, comprising
• determining whether a copy of the first OAM message has been previously received by the relay node based on a value comprised in the first OAM message that is distinct from a data flow specific sequence number associated with data packets of the data flow, and
• transmitting a second OAM message, or preventing the first OAM message from being forwarded to another relay node, based on the determination whether a copy of the first OAM message has been previously received by the relay node.