H3C Technologies H3C S12500-X Series Switches - Manual (Page 11)

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Table 3 Ethernet OAM link error events
Ethernet OAM link events Description
Errored symbol event
An errored symbol event occurs when the number of detected symbol errors
in the detection window (specified number of received symbols) exceeds the
predefined threshold.
Errored frame event
An errored frame event occurs when the number of detected error frames in
the detection window (specified detection interval) exceeds the predefined
threshold.
Errored frame period event
An errored frame period event occurs when the number of frame errors in
the detection window (specified number of received frames) exceeds the
predefined threshold.
Errored frame seconds event
An errored frame seconds event occurs when the number of errored frame
seconds (the second in which an errored frame appears is called an
"errored frame second") detected on a port in the detection window
(specified detection interval) reaches the predefined threshold.
Remote fault detection
Information OAMPDUs are exchanged periodically among Ethernet OAM entities across established
OAM connections. In a network where traffic is interrupted due to device failures or unavailability, the
flag field defined in Information OAMPDUs allows an Ethernet OAM entity to send error information (any
critical link event type shown in Table 4 ) to its peer. You can use the log information to track ongoing link
status and troubleshoot problems promptly.
Table 4 Critical link events
Type Description OAMPDU transmission frequencies
Link Fault Peer link signal is lost. Once per second.
Dying Gasp
An unexpected fault, such as power failure,
occurred.
Non-stop.
Critical Event An undetermined critical event happened. Non-stop.
The switch is able to receive Information OAMPDUs carrying the critical link events listed in Table 4 .
The switch is unable to send Information OAMPDUs carrying Link Fault events.
The switch is able to send Information OAMPDUs carrying Dying Gasp events when the switch is
rebooted or relevant ports are manually shut down. Physical IRF ports, however, are unable to send this
type of OAMPDUs.
The switch is unable to send Information OAMPDUs carrying Critical Events.
Protocols and standards
IEEE 802.3ah, Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and
Physical Layer Specifications