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Catalyst 2960 Switch SoftwareConfiguration Guide
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Chapter29 Co nfiguring QoS
Configuring Standard QoS
To return to the default CoS input queue threshold map or the default DSCP input queue threshold map,
use the no mls qos srr-queue input cos-map or the no mls qos srr-queue input dscp-map global
configuration command. To return to the default WTD threshold percentages, use the no mls qos
srr-queue input threshold queue-id global configuration command.
This example shows how to map DSCP values 0 to 6 to ingress queue 1 and to threshold 1 with a drop
threshold of 50 percent. It maps DSCP values 20 to 26 to ingress queue 1 and t o threshold 2 with a drop
threshold of 70 percent:
Switch(config)# mls qos srr-queue input dscp-map queue 1 threshold 1 0 1 2 3 4 5 6
Switch(config)# mls qos srr-queue input dscp-map queue 1 threshold 2 20 21 22 23 24 25 26
Switch(config)# mls qos srr-queue input threshold 1 50 70
Command Purpose
Step1 configure terminal Enter global configuration mode.
Step2 mls qos srr-queue input dscp-map
queue queue-id threshold threshold-id
dscp1...dscp8
or
mls qos srr-queue input cos-map
queue queue-id threshold threshold-id
cos1...cos8
Map DSCP or CoS values to an ingress queue and to a threshold ID.
By default, DSCP values 0–39 and 48–63 are mapped to queue 1 and
threshold 1. DSCP values 40–47 are mapped to queue 2 and thres hold 1.
By default, CoS values 0–4, 6, and 7 are mapped to queue 1 and threshold
1. CoS value 5 is mapped to queue 2 and threshold 1.
•For queue-id, the range is 1 to 2.
•For threshold-id, the range is 1 to 3. The drop-threshold percentage
for threshold 3 is predefined. It is set to the queue-full state.
•For dscp1...dscp8, enter up to eight values, and separate each value
with a space. The range is 0 to 63.
•For cos1...cos8, enter up to eight values, and separate each value with
a space. The range is 0 to 7.
Step3 mls qos srr-queue input threshold
queue-id threshold-percentage1
threshold-percentage2
Assign the two WTD threshold percentages for (threshold 1 and 2) to an
ingress queue. The default, both thresholds are set to 100 percent.
•For queue-id, the range is 1 to 2.
•For threshold-percentage1 threshold-percentage2, the range is 1 to
100. Separate each value with a space.
Each threshold value is a percentage of the total number o f queue
descriptors allocated for the queue.
Step4 end Return to privileged EXEC mode.
Step5 show mls qos maps Verify your entries.
The DSCP input queue threshold map appears as a matrix. The d1 column
specifies the most-significant digit of the DSCP number; the d2 row
specifies the least-significant digit in the DSCP number. The intersection
of the d1 and the d2 values provides the queue ID and threshold ID; for
example, queue 2 and threshold 1 (02-01).
The CoS input queue threshold map shows the CoS value in the top row
and the corresponding queue ID and threshold ID in th e second row; for
example, queue 2 and threshold 2 (2-2).
Step6 copy running-config startup-config (Optional) Save your entries in the configuration file.