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Configuring OAM (Only for Certain Devices) Ethernet OAM
User Guide 989
1
Ethernet OAM
1.1 Overview
Note:
Ethernet OAM is only available on certain devices. To check whether your device supports this feature,
refer to the actual web interface. If Ethernet OAM is available, there is MAINTENANCE > Ethernet OAM
in the menu structure.
Ethernet OAM (Operation, Administration, and Maintenance) is a Layer 2 protocol for monitoring
and troubleshooting Ethernet networks. It can monitor link performance, monitor faults and
generate alarms so that a network administrator can manage the network effectively. TP-Link
switches support EFM OAM which is defined in IEEE 802.3ah.
The following basic concepts of OAM will be introduced: OAM entity, OAMPDUs (OAM Protocol
Data Units), and OAM connection.
OAM Entity
A port that is enabled with OAM on the switch is called an OAM entity.
OAMPDUs
Through OAMPDUs exchanged between OAM entities, failure conditions on the network are
reported to network administrators. The OAMPDUs are defined as follows:
â– Information OAMPDU: The Information OAMPDU is used to send state information,
such as local information, remote information, and user-defined information, to the
remote OAM entity for maintaining OAM connection.
â– Event Notification OAMPDU: The Event Notification OAMPDU is used for the Link
Monitoring feature. The local OAM entity can use the Event Notification OAMPDU to
notify the remote OAM entity that a fault has occurred to the link.
â– Loopback Control OAMPDU: Loopback Control OAMPDU is used for the Remote
Loopback feature. The local OAM entity can control OAM remote loopback state of the
remote OAM entity through the Loopback Control OAMPDU.
OAM Connection
OAM connection is established between OAM entities before OAM works. An OAM entity
can operate in two modes: active and passive. Only the active OAM entity can initiate
an OAM connection; the passive OAM entity waits and responds to OAM connection
establishment requests. So at least one of the two entities should be in active mode.
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