HP Cisco Catalyst Blade Switch 3020 Cisco Catalyst Blade Switch 3020 for HP So - Page 586
Configuring the Ingress Priority Queue, mls qos srr-queue
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Configuring Standard QoS Chapter 27 Configuring QoS Beginning in privileged EXEC mode, follow these steps to allocate bandwidth between the ingress queues. This procedure is optional. Step 1 Step 2 Command configure terminal mls qos srr-queue input bandwidth weight1 weight2 Step 3 Step 4 Step 5 end show mls qos interface queueing or show mls qos input-queue copy running-config startup-config Purpose Enter global configuration mode. Assign shared round robin weights to the ingress queues. The default setting for weight1 and weight2 is 4 (1/2 of the bandwidth is equally shared between the two queues). For weight1 and weight2, the range is 1 to 100. Separate each value with a space. SRR services the priority queue for its configured weight as specified by the bandwidth keyword in the mls qos srr-queue input priority-queue queue-id bandwidth weight global configuration command. Then, SRR shares the remaining bandwidth with both ingress queues and services them as specified by the weights configured with the mls qos srr-queue input bandwidth weight1 weight2 global configuration command. For more information, see the "Configuring the Ingress Priority Queue" section on page 27-68. Return to privileged EXEC mode. Verify your entries. (Optional) Save your entries in the configuration file. To return to the default setting, use the no mls qos srr-queue input bandwidth global configuration command. This example shows how to assign the ingress bandwidth to the queues. Priority queueing is disabled, and the shared bandwidth ratio allocated to queue 1 is 25/(25+75) and to queue 2 is 75/(25+75): Switch(config)# mls qos srr-queue input priority-queue 2 bandwidth 0 Switch(config)# mls qos srr-queue input bandwidth 25 75 Configuring the Ingress Priority Queue You should use the priority queue only for traffic that needs to be expedited (for example, voice traffic, which needs minimum delay and jitter). The priority queue is guaranteed part of the bandwidth to reduce the delay and jitter under heavy network traffic on an oversubscribed ring (when there is more traffic than the backplane can carry, and the queues are full and dropping frames). SRR services the priority queue for its configured weight as specified by the bandwidth keyword in the mls qos srr-queue input priority-queue queue-id bandwidth weight global configuration command. Then, SRR shares the remaining bandwidth with both ingress queues and services them as specified by the weights configured with the mls qos srr-queue input bandwidth weight1 weight2 global configuration command. 27-68 Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide OL-8915-01
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