8
exchange of Event Notification OAMPDUs. When detecting a link error event listed in
OAM entity sends an Event Notification OAMPDU to notify the remote OAM entity. With the log
information, network administrators can keep track of network status in time.
Table 7
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 over a specific detection
interval exceeds the configured threshold.
Errored frame event
An errored frame event occurs when the number of
detected error frames over a specific interval exceeds
the configured threshold.
Errored frame period event
An errored frame period event occurs if the number of
frame errors in a specified number of received frames
exceeds the configured threshold.
Errored frame seconds event
An errored frame seconds event occurs when the
number of error frame seconds detected on a port
over a detection interval reaches the error threshold.
NOTE:
•
The system transforms the period of detecting errored frame period events into the maximum number of
64-byte frames that a port can send in the specific period. The system takes the maximum number of
frames sent as the period. The maximum number of frames sent is calculated using this formula: the
maximum number of frames = interface bandwidth (bps) × errored frame period event detection period
(in ms)/(64 × 8 × 1000)
•
If errored frames appear in a certain second, this second is an errored frame second.
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—the critical link event type—to its peer. In this way, you can keep track of link status in time
through the log information and troubleshoot in time.
Table 8
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
