Dell EMC SmartFabric OS10 User Guide Release 10.5.0

Policing traffic

Use policing to limit the rate of ingress traffic flow. The flow can be all the ingress traffic on a port or a particular flow defined using a QoS class-map.

Peak rate is the maximum rate for traffic arriving or leaving an interface under normal traffic conditions. Peak burst size indicates the maximum size of unused peak bandwidth that is aggregated. This aggregated bandwidth enables brief durations of burst traffic that exceeds the peak rate.

Interface rate policing limits the rate of traffic that is received on an interface.

Configure Interface rate policing

1. Create a QoS type empty class-map to match all the traffic.

   OS10(config)# class-map example-cmap-all-traffic

2. Create a QoS type policy-map to define a policer.

   OS10(config)# policy-map example-interface-policer
   OS10(config-pmap-qos)# class example-cmap-all-traffic
   OS10(config-pmap-c-qos)#police cir 4000 pir 6000
   

3. Apply the QoS type policy-map to an interface.

   OS10(config)# interface ethernet 1/1/14
   OS10(conf-if-eth1/1/14)# service-policy input type qos example-interface-policer
   

Flow rate policing controls the rate of flow of traffic.

Configure flow rate policing

1. Create a QoS type class-map to match the traffic flow.

   OS10(config)# class-map example-cmap-cos3 
   OS10(config-cmap-qos)# match cos 3

2. Create a QoS type policy-map to define a policer, and optionally assign a traffic class ID for the CoS flow to redirect the policed traffic to a nondefault queue.

   OS10(config)# policy-map example-flow-policer
   OS10(config-pmap-qos)# class example-cmap-cos3
   OS10(config-pmap-c-qos)# set qos-group 3
   OS10(config-pmap-c-qos)#police cir 4000 pir 6000

3. Apply the QoS type policy-map to an interface.

   OS10(config)# interface ethernet 1/1/15
   OS10(conf-if-eth1/1/15)# service-policy input type qos example-flow-policer