Dell PowerSwitch S5212F-ON EMC SmartFabric OS10 User Guide Release 10.5.1 - Page 1332
Rate adjustment
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1. Apply the policy-map to the interface in INTERFACE mode or all interfaces in SYSTEM-QOS mode. system qos OR interface ethernet node/slot/port[:subport] 2. Enter the output service-policy in SYSTEM-QOS mode or INTERFACE mode. service-policy {output} type {queuing} policy-map-name Enable strict priority on class-map and apply the policy-map globally OS10(config)# class-map type queuing example-cmap-strictpriority OS10(config-cmap-queuing)# match queue 7 OS10(config-cmap-queuing)# exit OS10(config)# policy-map type queuing example-pmap-strictpriority OS10(config-pmap-queuing)# class example-cmap-strictpriority OS10(config-pmap-c-que)# priority OS10(config-pmap-c-que)# exit OS10(config-pmap-queuing)# exit OS10(config)# system qos OS10(config-sys-qos)# service-policy output type queuing example-pmap-strictpriority Enable strict priority on interface NOTE: You can apply a policy-map globally in SYSTEM-QOS mode or apply it on the interface. OS10 does not support applying the same policy-map in SYSTEM-QOS mode as well as at the interface level. However, you can apply a different queuing policy-map in SYSTEM-QOS mode or at the interface level. In this case, the policy-map applied at the interface takes precedence over the policy-map applied globally. OS10(config)# interface ethernet 1/1/5 OS10(conf-if-eth1/1/5)# service-policy output type queuing example-pmap-strictpriority View policy-map OS10(conf-if-eth1/1/5)# do show policy-map Service-policy(queuing) output: example-pmap-strictpriority Class-map (queuing): example-cmap-strictpriority priority Configuration notes Dell EMC PowerSwitch S4200-ON Series: If PFC is provisioned, the control packets injected by CPU shares queue-7 while egressing on a front panel interface. If queues other than queue-7 are provisioned as strict priority, it is recommended to provision queue-7 as strict priority too, to reduce latency or loss of control packets. Rate adjustment QoS features such as policing and shaping do not include overhead fields such as Preamble, smart frame delimiter (SFD), interframe gap (IFG), and so on. For rate calculations, these feature only include the frame length between the destination MAC address (DMAC) and the CRC field. You can optionally include the following overhead fields in rate calculations by enabling rate adjustment: ● Preamble-7 bytes ● Start frame delimiter-1 byte ● Destination MAC address-6 bytes ● Source MAC address-6 bytes ● Ethernet type/length-2 bytes ● Payload-variable ● Cyclic redundancy check-4 bytes 1332 Quality of service
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