![Huawei Quidway NetEngine40E Configuration Manual - Reliability Download Page 666](http://html.mh-extra.com/html/huawei/quidway-netengine40e/quidway-netengine40e_configuration-manual-reliability_169453666.webp)
Table 8-13
Minor link events
Minor Link Event
Description
Errored symbol event
An errored symbol event occurs when the number of
symbol errors detected during a specified interval
exceeds a predefined threshold.
Errored frame event
An errored frame event occurs when the number of
errored frames detected during a specified interval
exceeds a predefined threshold.
Errored frame second event
An errored frame second event occurs when the
number of errored frame seconds detected during a
specified interval exceeds a predefined threshold.
l
Remote loopback
When an interface sends non-EFM PDUs to the peer, the peer loops back the PDUs to the
transmitting interface, instead of forwarding the PDUs to their destination addresses. This
function is called remote loopback.
Remote loopback can be used for fault location and link performance testing. Performing
remote loopback periodically provides a way to detect network faults rapidly. Furthermore,
performing remote loopback by network segment helps engineers locate the network
segment where faults occur.
l
Remote fault indication
When traffic is interrupted because a remote EFM entity fails or becomes unavailable, the
remote EFM entity will send an OAMPDU carrying one of the critical link events listed in
to the local EFM entity. This helps administrators to understand link status in
real time and troubleshoot link faults promptly.
Table 8-14
Critical link events
Critical Link Event
Description
Link Fault
A loss of signal (LoS) error occurs because a physical link
fails.
Dying Gasp
An unexpected status change or event occurs because a
remote device or board is reset.
Critical Event
An unidentified critical event occurs because a fault is
detected using association between the remote EFM entity
and a specific feature.
EFM Features Supported by the NE80E/40E
This section describes EFM features supported by the NE80E/40E. Familiarizing yourself with
these features helps you complete the configuration tasks quickly and efficiently.
EFM is link-level OAM, and provides the following functions:
HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
8 Ethernet OAM Configuration
Issue 02 (2014-09-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
649