HP Cisco Catalyst Blade Switch 3020 Cisco Catalyst Blade Switch 3020 for HP So - Page 587
Configuring Egress Queue Characteristics, mls qos srr-queue input
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Chapter 27 Configuring QoS Configuring Standard QoS Beginning in privileged EXEC mode, follow these steps to configure the priority queue. This procedure is optional. Step 1 Step 2 Command configure terminal mls qos srr-queue input priority-queue queue-id bandwidth weight 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 a queue as the priority queue and guarantee bandwidth on the internal ring if the ring is congested. By default, the priority queue is queue 2, and 10 percent of the bandwidth is allocated to it. • For queue-id, the range is 1 to 2. • For bandwidth weight, assign the bandwidth percentage of the internal ring. The range is 0 to 40. The amount of bandwidth that can be guaranteed is restricted because a large value affects the entire ring and can degrade performance. 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 priority-queue queue-id global configuration command. To disable priority queueing, set the bandwidth weight to 0, for example, mls qos srr-queue input priority-queue queue-id bandwidth 0. This example shows how to assign the ingress bandwidths to the queues. Queue 1 is the priority queue with 10 percent of the bandwidth allocated to it. The bandwidth ratios allocated to queues 1 and 2 is 4/(4+4). SRR services queue 1 (the priority queue) first for its configured 10 percent bandwidth. Then SRR equally shares the remaining 90 percent of the bandwidth between queues 1 and 2 by allocating 45 percent to each queue: Switch(config)# mls qos srr-queue input priority-queue 1 bandwidth 10 Switch(config)# mls qos srr-queue input bandwidth 4 4 Configuring Egress Queue Characteristics Depending on the complexity of your network and your QoS solution, you might need to perform all of the tasks in the next sections. You will need to make decisions about these characteristics: • Which packets are mapped by DSCP or CoS value to each queue and threshold ID? • What drop percentage thresholds apply to the queue-set (four egress queues per port), and how much reserved and maximum memory is needed for the traffic type? • How much of the fixed buffer space is allocated to the queue-set? • Does the bandwidth of the port need to be rate limited? • How often should the egress queues be serviced and which technique (shaped, shared, or both) should be used? OL-8915-01 Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide 27-69
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