Cisco WS-C3560G-24PS-E Software Configuration Guide - Page 575
Mapping DSCP or CoS Values to an Ingress Queue and Setting WTD Thresholds
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Chapter 28 Configuring QoS Configuring Standard QoS Mapping DSCP or CoS Values to an Ingress Queue and Setting WTD Thresholds You can prioritize traffic by placing packets with particular DSCPs or CoSs into certain queues and adjusting the queue thresholds so that packets with lower priorities are dropped. Beginning in privileged EXEC mode, follow these steps to map DSCP or CoS values to an ingress queue and to set WTD thresholds. This procedure is optional. Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Command configure terminal 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 mls qos srr-queue input threshold queue-id threshold-percentage1 threshold-percentage2 end show mls qos maps copy running-config startup-config Purpose Enter global configuration mode. 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 threshold 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. 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 of queue descriptors allocated for the queue. Return to privileged EXEC mode. 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 the second row; for example, queue 2 and threshold 2 (2-2). (Optional) Save your entries in the configuration file. 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. 78-16156-01 Catalyst 3560 Switch Software Configuration Guide 28-53
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