Dell S4148U-ON OS10 Enterprise Edition User Guide Release 10.4.0E R2 - Page 559

Shaping traffic You can configure to shape the rate of egress traffic. When you enable rate shaping, the system buffers all traffic exceeding the specified rate till buffer memory is exhausted. The rate shaping mechanism uses all buffers reserved for an interface or queue and then shared buffer memory, till it reaches the configured threshold. Configure traffic shaping 1 Enter the policy-map type as queuing and configure a policy-map name in CONFIGURATION mode. policy-map type queuing policy-map-name 2 Enter a class name to apply to the shape rate in POLICY-MAP-QUEUEING mode-up to 32 characters. class class-name 3 (Optional) If you need rate shaping on a specific queue, match the corresponding qos-group in the class-map. If you do not configure the match qos-group command, rate shaping applies to all queues. match qos-group queue-number 4 Enter a minimum and maximum shape rate value in POLICY-MAP-QUEUEING-CLASS mode. shape {min {kbps | mbps | pps}min-value} {max {kbps | mbps | pps}max-value} • 0 to 40000000-kilobits per second kilobits per second-kbps • 0 to 40000 - megabits per second-mbps • 1 to 268000000 - in packets per second (pps) Bandwidth allocation You can allocate relative bandwidth to limit large flows and prioritize smaller flows. Allocate the relative amount of bandwidth to nonpriority queues when priorities queues are consuming maximum link bandwidth. Each egress queue of an interface can be scheduled as per Weighted Deficit Round Robin (WDRR) or by strict-priority (SP), which are mutually exclusive. If the bandwidth percent command is present, you cannot configure the priority command as it is used to assign bandwidth to a queue. 1 Create a class-map of type queuing and configure a name for the class-map in CONFIGURATION mode. class-map type queuing class-map-name 2 Apply the match criteria for the QoS group in CLASS-MAP mode. qos-group queue-number 3 Return to the CONFIGURATION mode. exit 4 Create a policy-map of type queuing and configure a policy-map name in CONFIGURATION mode. policy-map type queuing policy-map-name 5 Configure a queuing class in POLICY-MAP mode. class class-name 6 Assign a bandwidth percent (1 to 100) to nonpriority queues in POLICY-MAP-CLASS-MAP mode. bandwidth percent value Configure bandwidth allocation OS10(config)# class-map type queuing solar OS10(conf-cmap-queuing)# match qos-group 5 OS10(conf-cmap-queuing)# exit OS10(config)# policy-map lunar OS10(config)# policy-map type queuing lunar OS10(conf-pmap-queuing)# class solar OS10(conf-pmap-c-que)# bandwidth percent 80 Quality of service 559