NOTE
If the trust command with override configured has been used or packets do not carry the priority trusted
by the inbound interface, the AR2200-S searches the mappings between 802.1p priorities and other types
of priorities based on the default 802.1p priority configured by using the port priority command, and
changes packet priorities.
l If packets do not carry the priority trusted by the inbound interface, run the trust command
to configure the inbound interface to trust the priority in packets.
l If packets carry the priority trusted by the inbound interface, go to step 2.
l If packets carry the priority trusted by the inbound interface, check whether override is
configured in the trust command.
– If override is not configured, the AR2200-S does not change packet priorities after
performing priority mapping. Configure override in the trust command.
– If override is configured, go to step 2.
Step 2 Check whether priority mappings are correct.
Run the display qos map-table command to check whether the priority trusted by the interface
and priority mapping are correct.
l If not, run the qos map-table command to modify the configuration.
l If yes, go to step 3.
Step 3 Check whether there are configurations affecting priority mapping on the inbound interface.
1. Check whether traffic policing defining the re-marking action is configured on the inbound
interface.
Interface-based traffic policing takes precedence over priority mapping. If interface-based
traffic policing defining remark-8021p or remark-dscp is configured on the inbound
interface, the AR2200-S re-marks packet priorities.
Run the display this command in the view of the inbound interface to check whether the
qos car inbound command with remark-8021p or remark-dscp configured has been
used.
l If yes, delete the re-marking action or run the undo qos car inbound command to delete
traffic policing.
l If not, go to step b.
2. Check whether the traffic policy defining the re-marking action is configured in the inbound
direction on the inbound interface.
A traffic policy takes precedence over priority mapping. If the traffic policy used on the
inbound interface contains priority re-marking, remark local-precedence, or car with
remark-8021p or remark-dscp, the AR2200-S re-marks priorities of packets matching
the traffic classifier.
Run the display this command in the view of the inbound interface to check whether the
traffic-policy inbound command has been used.
l If the traffic-policy inbound command has been used, run the display traffic-policy
applied-record command to check the traffic policy record and the traffic behavior in
the traffic policy.
If the traffic policy has been applied successfully, run the display traffic behavior
user-defined command to check whether the traffic behavior contains packet priority
re-marking, internal priority re-marking, or car with remark-8021p or remark-dscp.
Huawei AR2200-S Series Enterprise Routers
Troubleshooting 9 QoS
Issue 01 (2012-01-06) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
242
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