Troubleshooting Procedure
NOTE
Saving the results of each troubleshooting step is recommended. If troubleshooting fails to correct the fault,
you will have a record of your actions to provide Huawei technical support personnel.
Procedure
Step 1 Check that queue-based traffic shaping parameters are set correctly.
Run the display this command in the interface view to check whether the qos queue-profile
command is used.
l If the qos queue-profile command is used, run the display qos queue-profile queue-profile-
name command to check the queue profile configuration.
– If the value of the GTS (CIR/CBS) field is -/-, queue-based traffic shaping is not
configured in the queue profile. Run the queue gts command in the queue profile view
to configure queue-based traffic shaping.
– If the value of the GTS (CIR/CBS) field is not -/-, queue-based traffic shaping is
configured in the queue profile. Record the index of the queue configured with traffic
shaping and go to step 2.
l If the qos queue-profile command is not used, run the qos queue-profile command to
configure a queue profile.
Step 2 Check whether the interface is configured with interface-based traffic shaping.
Check whether the qos gts command is used on the interface.
l If yes, go to step 3.
l If not, go to step 4.
Step 3 Check whether the CIR value for interface-based traffic shaping is greater than the sum of CIR
values for traffic shaping in queues on the interface.
Compare the CIR value for interface-based traffic shaping with the sum of CIR values of traffic
shaping in queues on the interface:
l If the CIR value for interface-based traffic shaping is smaller than the sum of CIR values for
traffic shaping in queues on the interface, queues on the interface cannot obtain sufficient
bandwidth. The traffic shaping result may be incorrect. Run the qos gts command to modify
interface-based traffic shaping parameters to ensure that the CIR value for interface-based
traffic shaping is greater than the sum of CIR values for traffic shaping in queues on the
interface.
l If the CIR value for interface-based traffic shaping is greater than the sum of CIR values for
traffic shaping in queues on the interface, go to step 4.
Step 4 Check whether packets enter traffic shaping queues.
Run the display qos queue statistics interface interface-type interface-number command to
view the packet statistics on each queue on the interface.
l If the values of Passed and Dropped fields in the command output are 0/0, packets do not
enter traffic shaping queues. Rectify the fault according to 9.2.1 Packets Enter Incorrect
Queues.
l If the values of Passed and Dropped fields in the command output are not 0/0, packets enter
traffic shaping queues. Check whether a large number of packets enter PQ queues (for
Huawei AR2200-S Series Enterprise Routers
Troubleshooting 9 QoS
Issue 01 (2012-01-06) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
254
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