Dell PowerSwitch S4128F-ON OS10 Enterprise Edition User Guide Release 10.4.3.0 - Page 975

2 Create a QoS type policy-map to color the traffic flow. OS10(config)# policy-map ect-color OS10(config-pmap-qos)# class cmap-dscp-3-ect OS10(config-pmap-c-qos)# set qos-group 3 OS10(config-pmap-c-qos)# set color yellow Modify packet fields You can modify the value of CoS or DSCP fields. 1 Create a QoS type class-map to match a traffic flow. OS10(config)# class-map cmap-dscp-3 OS10(config-cmap-qos)# match ip dscp 3 2 Modify the policy-map to update the DSCP field. OS10(config)# policy-map modify-dscp OS10(config-pmap-qos)# class cmap-dscp-3 OS10(config-pmap-c-qos)# set qos-group 3 OS10(config-pmap-c-qos)# set dscp 10 Shaping traffic You can shape the rate of egress traffic. When you enable rate shaping, the system buffers all traffic exceeding the specified rate until the buffer memory is exhausted. Rate shaping uses all buffers reserved for an interface or queue and shares buffer memory, until it reaches the configured threshold. Configure traffic shaping 1 Enter the queuing type policy-map 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. A maximum of 32 characters. class class-name 3 (Optional) Configure rate shaping on a specific queue by matching 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}min-value} {max {kbps | mbps}max-value} • 0 to 40000000-kilobits per second kilobits per second-kbps • 0 to 40000 - megabits per second-mbps 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. Schedule each egress queue of an interface 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. In S5148F-ON, bandwidth weight is equally applied to UC and MC. 1 Create a queuing type class-map 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 CONFIGURATION mode. exit Quality of service 975