H3C Technologies H3C S7500E Series Switches - Manual (Page 24)

3-5
Ethernet OAM link events Description
Errored frame period event
An errored frame period event occurs if the number of frame
errors in specific number of received frames exceeds the
predefined threshold.
Errored frame seconds event
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.
z 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)
z If errored frames appear in a certain second, this second is called 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 to
its peer. In this way, you can keep track of link status in time through the log information and
troubleshoot in time. Table 3-5 lists the critical link events and the transmission frequencies of the
corresponding OAMPDUs.
Table 3-5 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.