1-5
Table 1-5 Critical link error events
Ethernet OAM link events Description
Link Fault Peer link signal is lost.
Dying Gasp An unexpected fault, such as power failure, occurred.
Critical event An undetermined critical event happened.
As Information OAMPDUs are exchanged periodically across established OAM connections, an
Ethernet OAM entity can inform one of its OAM peers of link faults through Information OAMPDUs.
Therefore, the network administrator can keep track of link status in time through the log information
and troubleshoot in time.
Remote loopback testing
Remote loopback testing is available only after the Ethernet OAM connection is established. With
remote loopback enabled, the Ethernet OAM entity operating in active Ethernet OAM mode issues
remote loopback requests and the peer responds to them. If the peer operates in the loopback mode, it
returns all the PDUs except Ethernet OAMPDUs to the senders along the original paths.
Performing remote loopback testing periodically helps to detect network faults in time. Furthermore,
performing remote loopback testing by network segments helps to locate network faults.
Standards and Protocols
Ethernet OAM is defined in IEEE 802.3h.
Ethernet OAM Configuration Task List
Complete the following tasks to configure Ethernet OAM:
Task Remarks
Configuring Basic Ethernet OAM Functions Required
Configuring Errored Symbol Event Detection Optional
Configuring Errored Frame Event Detection Optional
Configuring Errored Frame Period Event Detection Optional
Configuring Link
Monitoring
Configuring Errored Frame Seconds Event Detection Optional
Enabling OAM Loopback Testing Optional
Configuring Basic Ethernet OAM Functions
As for Ethernet OAM connection establishment, a device can operate in active mode or passive mode.
After Ethernet OAM is enabled on an Ethernet port, according to its Ethernet OAM mode, the Ethernet
port establishes an Ethernet OAM connection with its peer port.
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