H3C LS-3100-52P-OVS-H3 Operation Manual page 213

The interval to send Information OAMPDUs is determined by a timer. Up to ten Information OAMPDUs
can be sent in a second.
Link monitoring
Error detection in an Ethernet is difficult, especially when the physical connection in the network is not
disconnected but network performance is degrading gradually. Link monitoring is used to detect and
indicate link faults in various environments. Ethernet OAM implements link monitoring through the
exchange of Event Notification OAMPDUs. Upon detecting a link error event listed in
local 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.
link events.
Table 1-4 Ethernet OAM link error events
Ethernet OAM link events
Errored symbol event
Errored frame event
Errored frame period event
Errored frame seconds event
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, that is, 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 called an errored frame second.
Remote fault detection
In a network where traffic is interrupted due to device failures or unavailability, the flag field defined in
Ethernet OAMPDUs allows an Ethernet OAM entity to send error information to its peer. It can identify
the critical link error events listed in
An errored symbol event occurs when the number of detected
symbol errors over a specific detection interval exceeds the
predefined threshold.
An errored frame event occurs when the number of detected
error frames over a specific interval exceeds the predefined
threshold.
An errored frame period event occurs if the number of frame
errors in specific number of received frames exceeds the
predefined threshold.
When the number of error frame seconds detected on a port over
a detection interval reaches the error threshold, an errored frame
seconds event occurs.
Table 1-5.
1-4
Table 1-4
Description
Table 1-4, the
describes the