Users Guide

For information about the current protocol to queue mapping and the rate-limit configured per queue, see show control-plane
info.
Configure control-plane policing
Rate-limiting the protocol CPU queues requires configuring control-plane type QoS policies.
● Create QoS policies, class maps and policy maps, for the desired CPU-bound queue.
● Associate the QoS policy with a particular rate-limit.
● Assign the QoS service policy to control plane queues.
By default, the peak information rate (pir) and committed information rate (cir) values are in packets per second (pps) for
control plane. CoPP for CPU queues converts the input rate from kilobits per second (kbps) to packets per second (pps),
assuming 64 bytes is the average packet size, and applies that rate to the corresponding queue – One kbps is roughly equivalent
to two pps.
1. Create a control-plane type class-map and configure a name for the class-map in CONFIGURATION mode.
class-map type control-plane example-copp-class-map-name
2. Return to CONFIGURATION mode.
exit
3. Create an input policy-map to assign the QoS policy to the desired service queues in CONFIGURATION mode.
policy-map type control-plane example-copp-policy-map-name
4. Associate a policy-map with a class-map in POLICY-MAP mode.
class example-copp-class-map-name
5. Configure marking for a specific queue number in POLICY-MAP-CLASS-MAP mode. Use the show control-plane
info command to view the list of control-plane queues.
set qos-group queue-number
6. Configure rate policing on incoming traffic in POLICY-MAP-CLASS-MAP mode.
police {cir committed-rate | pir peak-rate}
● cir committed-rate—Enter a committed rate value in pps, from 0 to 4000000.
● pir peak rate — Enter a peak-rate value in pps, from 0 to 40000000.
Create QoS policy for CoPP
OS10(config)# class-map type control-plane example-copp-class-map-name
OS10(config-cmap-control-plane)# exit
OS10(config)# policy-map type control-plane example-copp-policy-map-name
OS10(config-pmap-control-plane)# class example-copp-class-map-name
OS10(config-pmap-c)# set qos-group 2
OS10(config-pmap-c)# police cir 100 pir 100
View policy-map
OS10(config)# do show policy-map
Service-policy (control-plane) input: example-copp-policy-map-name
Class-map (control-plane): example-copp-class-map-name
set qos-group 2
police cir 100 bc 100 pir 100 be 100
Configuration notes
Dell EMC PowerSwitch S4200-ON Series:
● Shaping does not support traffic less than 468 kbps. Configure the shaping rates in multiples of 468.
● In System Flow ACL, ARP request and ARP response packets share the same CPU queue.
Quality of service
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