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8.2.3 Configuring Related Parameters of Ethernet CFM
By adjusting parameters of Ethernet CFM, you can detect connectivity of an Ethernet network
from end to end.
Before You Start
Before configuring parameters of Ethernet CFM, familiarize yourself with the usage scenario,
complete the pre-configuration tasks, and obtain the required data.
Usage Scenario
If Ethernet CFM is enabled, you can adjust related parameters according to your requirement.
In different application environments, you can adjust the following parameters:
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RMEP activation time
After the local device is enabled with the function of receiving CCMs from a certain RMEP,
the local device can display RMEP connectivity alarm in one of the following situations:
–
If the CC detects a connectivity fault between the local MEP and the RMEP, then, the
local device displays the alarm of the RMEP connectivity fault..
–
The physical link works normally between the local MEP and the RMEP. The peer
device is not configured with a MEP when the CC is performed; or, the MEP
configuration is performed after the CC is performed. In this case, if the local MEP does
not receive any CCMs from the RMEP in three consecutive sending intervals, the local
device considers that a connectivity fault occurs between the local MEP and the RMEP.
According to the preceding description, the RMEP connectivity fault alarm is incorrect.
To solve the problem, you can set the RMEP activation time.
If the local device is configured with the RMEP activation time and enabled with the
function of receiving CCMs from a certain RMEP, the local device can receive CCMs at
the set RMEP activation time. That is, the activation time for receiving CCMs from the
RMEP is the time reserved for configuring the RMEP.
At the set RMEP activation time, if the local MEP does not receive any CCMs in three
consecutive sending intervals, this means that a connectivity fault occurs between the local
MEP and the RMEP. In addition, the local device displays the alarm of the RMEP
connectivity fault.
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Anti-jitter time during alarm restoration
All the RMEPs of each MA use the following timers:
–
Alarm generation timer: Its interval is set to the anti-jitter time during alarm generation.
–
Alarm restoration timer: Its interval is set to the anti-jitter time during alarm restoration.
When the RMEP detects an alarm, the alarm generation timer is activated. After the timer
expires, the alarm is notified to the device. When the RMEP detects that the alarm is
restored, the alarm restoration timer is activated. After the timer expires, the alarm
restoration event is notified to the device.
If the RMEP frequently detects the alarm and alarm restoration signals, this means that
alarm flapping occurs.
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.
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