Dell C1048P Port Extender Networking Configuration Guide for the C9000 Series - Page 851
Strict-Priority Queuing, Configuring Policy-Based Rate Shaping, Allocating Bandwidth to Queue
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qos-policy-output 2. After you configure an output QoS policy, do one or more of the following: Strict-Priority Queuing Configuring Policy-Based Rate Shaping Allocating Bandwidth to Queue Specifying WRED Drop Precedence Strict-Priority Queuing You can configure strict-priority queueing in an output QoS policy. Strict-priority means that the system de-queues all packets from the assigned queue before servicing any other queues. Strict-priority queueing is performed using the Scheduler Strict feature. When scheduler strict is applied to multiple queues, the higher queue number takes precedence. For more information, see Enabling Strict-Priority Queueing. NOTE: Strict priority on a a global level is not supported. Configuring Policy-Based Rate Shaping To configure policy-based rate-shaping, use the rate-shape command. • Configure rate-shaping on egress traffic. QOS-POLICY-OUT mode 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. Quality of Service (QoS) 851
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