Dell PowerSwitch S4112F-ON OS10 Enterprise Edition User Guide Release 10.4.1.0 - Page 675
Bandwidth allocation, Strict priority queuing
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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. In S5148F-ON, bandwidth weight is equally applied to UC and MC. 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 View class-map OS10(conf-cmap-queuing)# do show class-map Class-map (queuing): solar (match-any) Match: qos-group 5 View policy-map OS10(conf-pmap-c-que)# do show policy-map Service-policy (queuing) output: solar Class-map (queuing): lunar bandwidth percent 80 Strict priority queuing OS10 uses queues for egress QoS policy-types. You can enable priorities to dequeue all packets from the assigned queue before servicing any other queues. When more than one queue is assigned strict priority, the highest number queue receives the highest priority. You can configure strict priority to any number of queues. By default, all queues schedule traffic per WDRR. You can use the priority command to assign the priority to a single unicast queue-this configuration supersedes the bandwidth percent configuration. A queue with priority enabled can starve other queues for the same egress interface. Consider the following when enabling priority queueing in S5148F-ON: Quality of service 675