Users Guide

1. Define a policy-map and create a policy-map name CONFIGURATION mode.
policy-map type queuing policy-map-name
2. Create a queuing class and configure a name for the policy-map in POLICY-MAP mode.
class class-map-name
3. Set the scheduler as strict priority in POLICY-MAP-CLASS-MAP mode.
priority
Apply policy-map
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.
Quality of service
1553