Huawei AR530 Series Configuration Manual page 279

Huawei AR530&AR550 Series Industrial Switch Routers
Configuration Guide - Reliability
Fault Notification
After the OAM discovery process finishes, two EFM entities at both ends of an EFM connection
exchange Information OAMPDUs to monitor link connectivity. When traffic is interrupted
because the remote EFM entity fails or becomes unavailable, the faulty EFM entity will send an
Information OAMPDU carrying a critical link event listed in
entity. After receiving the notification, the local EFM entity sends a trap to the NMS. An
administrator can view the trap on the NMS to determine the link status and take measures to
rectify the fault.
Table 7-5 Critical link event
Critical Link Event
Link fault
Dying gasp
Critical event
Link Loss
Remote Loopback
Figure 7-4
non-OAMPDUs to a remote interface, the remote interface loops the non-OAMPDUs back to
the local interface, not to the destination addresses of the non-OAMPDUs. This is remote
loopback. An EFM connection must be established to implement remote loopback.
Figure 7-4 Implementation of remote loopback
Interface 1
Issue 01 (2014-11-30)
demonstrates the implementation of remote loopback. When a local interface sends
NOTE
An OAM entity that initiates a loopback request must work in active mode.
All packets except EFM packets
(Active Mode)
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Description
If a loss of signal (LoS) error occurs because a physical link fails,
the local device sends a trap to the NMS.
If an unexpected status change or event occurs because a remote
device or board is reset, the local device sends a trap to the NMS.
If an unidentified critical event occurs because a fault is detected
using association between the remote EFM entity and a specific
feature, the local device sends a trap to the NMS. Remote EFM
entities can be associated with protocols, including bidirectional
forwarding detection (BFD) and connectivity fault management
(CFM).
If a loss of signal (LoS) error occurs because the interval at which
OAMPDUs are sent elapses, the local device sends a trap to the
NMS.
Interface 2
(Passive Mode)
Data Flow
7 EFM Configuration
Table 7-5 to the local EFM
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