Cisco WS-C2960-24TC-S Software Guide - Page 558
Mapping DSCP or CoS Values to an Ingress Queue and Setting WTD Thresholds, con terminal
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Configuring Standard QoS Chapter 28 Configuring QoS • How much of the available bandwidth is allocated between the queues? • Is there traffic (such as voice) that should be given high priority? These sections contain this configuration information: • Mapping DSCP or CoS Values to an Ingress Queue and Setting WTD Thresholds, page 28-58 (optional) • Allocating Buffer Space Between the Ingress Queues, page 28-59 (optional) • Allocating Bandwidth Between the Ingress Queues, page 28-60 (optional) • Configuring the Ingress Priority Queue, page 28-61 (optional) 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 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 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. 28-58 Catalyst 2960 Switch Software Configuration Guide OL-8603-04
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