Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 769
Allocating Bandwidth to Queue, Specifying WRED Drop Precedence, Queue
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rate-shape {kbps | pps} peak-rate {burst-kbps | burst-packets} [committed {kbps | pps} committed-rate {burst-kbps | burst-packets}] In a QoS output policy, you can configure rate-shaping on egress traffic: • In either kilobits per second (kbps) or packets per second (pps) • By specifying peak rate and the peak burst, and (optionally) committed rate and committed burst size You must configure the peak rate and peak burst size using the same value: kilobits or packets per second. Similarly, you must configure the committed rate and committed burst size with the same measurement. Peak rate refers to the maximum rate for traffic arriving or exiting an interface under normal traffic conditions. Peak burst size indicates the maximum size of unused peak bandwidth that is aggregated. This aggregated bandwidth enables brief durations of burst traffic that exceeds the peak rate and committed burst. Committed rate refers to the guaranteed bandwidth for traffic entering or leaving the interface under normal network conditions. When traffic propagates at an average rate that is less than or equal to the committed rate, it is considered to be green-colored or coded. When the transmitted traffic falls below the committed rate, the bandwidth, which is not used by any traffic that is traversing the network, is aggregated to form the committed burst size. Traffic is considered to be green-colored up to the point at which the unused bandwidth does not exceed the committed burst size. Allocating Bandwidth to Queue The switch schedules packets for egress based on Deficit Round Robin (DRR). This strategy offers a guaranteed data rate. Allocate bandwidth to queues only in terms of percentage in 4-queue and 8-queue systems. The following table shows the default bandwidth percentage for each queue. Table 72. Default Bandwidth Weights Queue Default Bandwidth Percentage for 4- Queue System 0 6.67% 1 13.33% 2 26.67% 3 53.33% 4 - 5 - 6 - 7 - Default Bandwidth Percentage for 8- Queue System 1% 2% 3% 4% 5% 10% 25% 50% When you assign a percentage to one queue, note that this change also affects the amount of bandwidth that is allocated to other queues. Therefore, whenever you are allocating bandwidth to one queue, Dell Networking recommends evaluating your bandwidth requirements for all other queues as well. • Allocate bandwidth to queues. bandwidth-percentage Assign each queue a bandwidth percentage ranging from 1 to 100%, in increments of 1%. Specifying WRED Drop Precedence You can configure the WRED drop precedence in an output QoS policy. • Specify a WRED profile to yellow and/or green traffic. QOS-POLICY-OUT mode Quality of Service (QoS) 769
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