rfc9551v2.txt   rfc9551.txt 
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On-path telemetry: on-path telemetry can be realized as a hybrid OAM On-path telemetry: on-path telemetry can be realized as a hybrid OAM
method. The origination of the telemetry information is method. The origination of the telemetry information is
inherently in band as packets in a DetNet flow are used as inherently in band as packets in a DetNet flow are used as
triggers. Collection of the on-path telemetry information can be triggers. Collection of the on-path telemetry information can be
performed using in-band or out-of-band OAM methods. performed using in-band or out-of-band OAM methods.
1.2. Requirements Language 1.2. Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP "OPTIONAL" in this document are to be interpreted as described in
14 [RFC2119] [RFC8174] when, and only when, they appear in all BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here. The requirements language is used in capitals, as shown here. The requirements language is used in
Sections 1.1 and 6, and applies to the implementations of DetNet OAM. Sections 1.1 and 6, and applies to the implementations of DetNet OAM.
2. Role of OAM in DetNet 2. Role of OAM in DetNet
DetNet networks are expected to provide communications with DetNet networks are expected to provide communications with
predictable low packet delay, packet loss, and packet misordering. predictable low packet delay, packet loss, and packet misordering.
Most critical applications will define a set of SLOs to be required Most critical applications will define a set of SLOs to be required
for the DetNet flows they generate. for the DetNet flows they generate.
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3. the monitoring of levels of resources allocated for a particular 3. the monitoring of levels of resources allocated for a particular
DetNet flow. Such resources include, but are not limited to, DetNet flow. Such resources include, but are not limited to,
buffer utilization and scheduler transmission calendar. buffer utilization and scheduler transmission calendar.
4. the monitoring of any subset of paths traversed through the 4. the monitoring of any subset of paths traversed through the
DetNet domain by a DetNet flow. DetNet domain by a DetNet flow.
6.2. For the DetNet Service Sub-layer 6.2. For the DetNet Service Sub-layer
The OAM functions for the DetNet service sub-layer allow, for The OAM functions for the DetNet service sub-layer allow, for
example, the recognization/discovery of DetNet relay nodes, the example, the recognizing/discovery of DetNet relay nodes, the
gathering of information about their configuration, and the checking gathering of information about their configuration, and the checking
of their operation or status. of their operation or status.
The requirements on OAM for a DetNet relay node are that DetNet OAM The requirements on OAM for a DetNet relay node are that DetNet OAM
MUST: MUST:
1. provide OAM functions for the DetNet service sub-layer. 1. provide OAM functions for the DetNet service sub-layer.
2. support the discovery of DetNet relay nodes in a DetNet network. 2. support the discovery of DetNet relay nodes in a DetNet network.
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