H3C S5120-EI Series, Руководство по эксплуатации

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1-5
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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)
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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 1-5 lists the critical link events and the transmission frequencies of the
corresponding OAMPDUs.
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.
The support of S5120-EI series Ethernet switches for information OAMPDUs carrying critical link events
is as follows:
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S5120-EI series Ethernet switches are able to receive information OAMPDUs carrying the critical
link events listed in
Table 1-5 .
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Only the Gigabit optical ports are able send information OAMPDUs carrying Link Fault events.
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S5120-EI series Ethernet switches are able to send information OAMPDUs carrying Dying Gasp
events when the device is rebooted or relevant ports are manually shut down. Physical IRF ports,
however, are unable to send this type of OAMPDUs. For more information about physical IRF ports,
see
IRF Configuration
in the
System Volume
.
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S5120-EI series Ethernet switches are unable to send information OAMPDUs carrying Critical
Events.
Remote loopback
Remote loopback is available only after the Ethernet OAM connection is established. With remote
loopback enabled, the Ethernet OAM entity operating in active Ethernet OAM mode sends