HP Comware 5 Debug Manual Vol 3

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The packets from Router C are classified into three classes according to their DSCP values. A QoS
policy is applied to the packets in the outbound direction of the egress port of Router A:
 Applying assured forwarding (AF) policy for the packets with the DSCP value A F 11 or A F21,
setting the minimum to bandwidth percentage to 5%.
 Applying expedited forwarding (EF) policy to the packets with the DSCP value EF, setting the
maximum bandwidth percentage to 30%.
# Enable CBQ AF debugging and CBQ EF debugging on Router A. When the traffic of an AF class
exceeds the minimum bandwidth and the traffic of the EF class exceeds the maximum bandwidth, the
following information is generated:
<RouterA> debugging qos cbq af
<RouterA> debugging qos cbq ef
*Apr 26 05:19:13:589 2007 RouterA qos/7/qos_Debug:
QOS_CBQEF: Dropped a packet of class id 4 from the EF queue for token-bucket, and the
current length is 1
// Packets matching class ID 4 were dropped by the EF queue due to token bucket restrictions, and the
current EF queue length was 1.
*Apr 26 05:22:38:885 2007 RouterA QOS/7/QOS_Debug:
QOS_CBQAF: Dropped a packet of class id 2 from the AF queue for tail-drop, and the current
length is 64
// Packets matching class 2 were dropped by the AF queue in the way of tail-drop, and the current AF
queue length is 64.
debugging qos error
Use debugging qos error to enable QoS error debugging.
Use undo debugging qos error to disable QoS error debugging.
Syntax
debugging qos error
undo debugging qos error
Default
QoS error debugging is disabled.
Views
User view
Default command level
1: Monitor level
Usage guidelines
Table 7 describes output fields and messages for the debugging qos error command.
Table 162 Output from the debugging qos error command
Field
Description
Getting input packet link-layer-head length failed
QoS failed to obtain the link layer header length of
incoming packets.
Creating MQC flow-statistic timer failed QoS failed to create an MQC flow-statistics timer.
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