![Huawei Quidway NetEngine40E Configuration Manual - Reliability Download Page 760](http://html.mh-extra.com/html/huawei/quidway-netengine40e/quidway-netengine40e_configuration-manual-reliability_169453760.webp)
802.1p priorities carried by packets on a network are used to differentiate services, and
therefore different policies can be deployed for services. As shown in
802.1p priority values contained in traffic passing through the P are 1 and 2.
Two-way frame delay measurement is performed for the link between PE1 and PE2.
Assume that traffic (with the priority value of 2) that is not involved in frame delay
measurement is sent out after two-way frame delay measurement is enabled. The traffic is
forwarded preferentially, because its priority is high. As a result, the traffic (with the priority
value of 1) that is involved in frame delay measurement fails to reach PE2 in time, causing
incorrect frame delay statistics.
802.1p-priority-based two-way frame delay measurement can be configured for the VLL
for accurate proactive frame delay tests.
Figure 8-50
Networking diagram for priority-based frame loss measurement on a VLL
CE1
PE1
PE2
CE2
User
Network
User
Network
MEP
Y.1731
P
Priority 1
Priority 2
Procedure
l
Configure on-demand two-way frame delay measurement.
–
Configure on-demand two-way frame delay measurement for a PW.
1.
Perform the following steps on the devices at both ends of a PW where two-way
frame delay measurement will be implemented:
a.
Run:
system-view
The system view is displayed.
b.
Run:
cfm md
md-name
The MD view is displayed.
c.
Run:
ma
ma-name
The MA view is displayed.
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.
743