Common Causes
This fault is commonly caused by one of the following:
l Congestion avoidance is not configured on the outbound interface.
l WRED parameters are set incorrectly.
l Packets enter incorrect queues.
Troubleshooting Flowchart
Figure 9-12 shows the troubleshooting flowchart.
Figure 9-12 Troubleshooting flowchart for ineffective congestion avoidance
Congestion
avoidance fails to
take effect
Configure a queue profile
on outbound interface
Is fault rectified?
End
No
Do packets
enter specified
queues?
See “Packets Enter
Incorrect Queues”
Is fault rectified?
No
Yes
Yes
No
No
No
Is fault rectified?
Yes
No
Yes
Yes
Yes
Seek technical
support
Set WRED parameters
Are WRED
parameters correct?
Is congestion
avoidance set on outbound
interface?
Huawei AR2200-S Series Enterprise Routers
Troubleshooting 9 QoS
Issue 01 (2012-01-06) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
258
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