Enabling Single-Ended Frame Loss Measurement On A Vll - Huawei NetEngine80E Configuration Manual - Reliability
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HUAWEI NetEngine80E/40E Router
Configuration Guide - Reliability
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9.2.4 Enabling Single-Ended Frame Loss Measurement on a VLL
Single-ended frame loss measurement on a VLL includes on-demand single-ended frame loss
measurement and proactive single-ended frame loss measurement.
Context
On-demand OAM refers to OAM actions that are initiated by manual intervention for a limited
time to carry out diagnostics. On-demand OAM results in singular or periodic OAM actions
during the diagnostics time. Proactive OAM refers to OAM actions that are carried out
continuously to permit proactive reporting of faults or performance results. Single-ended frame
loss measurement on a VLL includes on-demand single-ended frame loss measurement and
proactive single-ended frame loss measurement.
l
l
Issue 02 (2011-09-10)
NOTE
If 8021p 8021p-value is specified, frame loss measurement based on a specified 802.1p priority is
performed on the receiving device. If 8021p 8021p-value is not specified, frame loss measurement based
on all priorities is performed on the receiving device.
To implement singular or periodic frame loss measurement on a PW, configure on-demand
single-end frame loss measurement on a VLL.
To implement continual frame loss measurement on a PW, configure proactive single-
ended frame loss measurement on a VLL.
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 on the VLL are 1 and 2.
Frame loss 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 loss measurement is sent
out after frame loss 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 loss measurement fails to reach PE2 in time, causing incorrect frame loss statistics.
802.1p-priority-based single-ended frame loss measurement can be configured for the VLL
for accurate proactive frame loss tests.
NOTE
The configuration of 802.1p priority mapping for AC-side packets allows flexible frame loss
measurement on PWs.
l Priority mapping based on simple traffic classification can map a traffic priority on one type of
network to that on another type of network. This enables traffic to be transmitted on another type
of network based on the previous priority or the priority configured by users. After receiving
packets, a PE maps external priorities to internal priorities and re-marks DiffServ CoS values
and colors. Before sending packets, the PE maps the internal priorities to external priorities.
l One-way frame loss measurement on a VLL can be configured based on simple traffic
classification. Priority mappings are set on PEs to change priorities in packets or re-classify the
packets. This allows flexible frame loss measurement.
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9 Y.1731 Configuration
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