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After remote loopback is disabled, run the
display efm session
command on either of the devices
on the link. The command output shows that the EFM status on the interfaces connecting the
two devices is
Detect
or
Discovery
.
<HUAWEI>
display efm session interface gigabitethernet 1/0/1
Interface EFM State Loopback Timeout
----------------------------------------------------------------------
GigabitEthernet1/0/1
Detect
--
After test packets are sent, run the
display test-packet result
command on the device where the
interface in active EFM mode resides to display statistics about returned test packets.
<HUAWEI>
display test-packet result
TestResult Value
--------------------------------------------------------
PacketsSend : 5
PacketsReceive : 0
PacketsLost : 5
BytesSend : 320
BytesReceive : 0
BytesLost : 320
StartTime : 11-13-2008 14:44:13
EndTime : 11-13-2008 14:44:14
8.3.5 Configuring Remote Fault Indication
Remote fault indication is used to detect remote device faults and monitor Ethernet link
performance.
Context
After setting up an EFM connection, two EFM entities exchange information OAMPDUs
periodically. When traffic is interrupted because an EFM entity fails or becomes unavailable,
the faulty EFM entity will send an information OAMPDU carrying a critical link event flag to
its remote EFM entity, record a log, and send an alarm. This mechanism helps administrators to
understand the link status in real time and troubleshoot link faults promptly.
On the network shown in
, if a fault occurs on PE2, PE2 sends an information
OAMPDU carrying a critical link event flag to the CE. Association between EFM and Port1 is
triggered and services are switched to the backup path. This association ensures reliable traffic
transmission.
Figure 8-32
Remote fault indication and association between EFM and an interface
PE1
PE2
CE
User
Network
DSLAM
Port1
EFM
IP/MPLS
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.
666