Cisco WS-C2960-24TC-S Software Guide - Page 567
Configuring SRR Shared Weights on Egress Queues, no srr-queue bandwidth share, con terminal
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Chapter 28 Configuring QoS Configuring Standard QoS Configuring SRR Shared Weights on Egress Queues In shared mode, the queues share the bandwidth among them according to the configured weights. The bandwidth is guaranteed at this level but not limited to it. For example, if a queue empties and does not require a share of the link, the remaining queues can expand into the unused bandwidth and share it among them. With sharing, the ratio of the weights controls the frequency of dequeuing; the absolute values are meaningless. Note The egress queue default settings are suitable for most situations. You should change them only when you have a thorough understanding of the egress queues and if these settings do not meet your QoS solution. Beginning in privileged EXEC mode, follow these steps to assign the shared weights and to enable bandwidth sharing on the four egress queues mapped to a port. This procedure is optional. Step 1 Step 2 Command configure terminal interface interface-id Step 3 srr-queue bandwidth share weight1 weight2 weight3 weight4 Step 4 Step 5 Step 6 end show mls qos interface interface-id queueing copy running-config startup-config Purpose Enter global configuration mode. Specify the port of the outbound traffic, and enter interface configuration mode. Assign SRR weights to the egress queues. By default, all four weights are 25 (1/4 of the bandwidth is allocated to each queue). For weight1 weight2 weight3 weight4, enter the weights to control the ratio of the frequency in which the SRR scheduler sends packets. Separate each value with a space. The range is 1 to 255. 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 srr-queue bandwidth share interface configuration command. This example shows how to configure the weight ratio of the SRR scheduler running on an egress port. Four queues are used, and the bandwidth ratio allocated for each queue in shared mode is 1/(1+2+3+4), 2/(1+2+3+4), 3/(1+2+3+4), and 4/(1+2+3+4), which is 10 percent, 20 percent, 30 percent, and 40 percent for queues 1, 2, 3, and 4. This means that queue 4 has four times the bandwidth of queue 1, twice the bandwidth of queue 2, and one-and-a-third times the bandwidth of queue 3. Switch(config)# interface gigabitethernet0/1 Switch(config-if)# srr-queue bandwidth share 1 2 3 4 OL-8603-04 Catalyst 2960 Switch Software Configuration Guide 28-67
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