Dell S5148F-ON OS10 Enterprise Edition User Guide Release 10.3.2E-R2 - Page 455

If the rate of control packets towards the CPU is higher than it can handle, CoPP provides a method to selectively drops some of the control traffic so the CPU can process high-priority control traffic. You can use CoPP to rate-limit traffic through each CPU port queue of the NPU. CoPP applies policy actions on all control-plane traffic. The control-plane class map does not use any match criteria. To enforce rate-limiting or rate policing on control-plane traffic, create policy maps. You can use the control-plane command to attach the CoPP service policies directly to the control-plane. The default rate limits apply to 12 CPU queues and the protocols mapped to each CPU queue. The control packet type to CPU ports control queue assignment is fixed. The only way you can limit the traffic towards the CPU is choose a low priority queue, and apply ratelimits on that queue to find a high rate of control traffic flowing through that queue. See show control-plane info for specific information on protocols and rate limits of CPU queues. 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 - 1 kbps is roughly equivalent to 2 pps. 1 Create a class-map of type control-plane and configure a name for the class-map in CONFIGURATION mode. class-map type control-plane 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 policy-map-name 4 Associate a policy-map with a class-map in POLICY-MAP mode. class class-name 5 Configure marking for a specific queue number in POLICY-MAP-CLASS-MAP mode (0 to 11). 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 (0 to 4000000). • pir peak rate - Enter a peak-rate value in pps (0 to 40000000). Create QoS policy for CoPP OS10(config)# class-map type control-plane copp OS10(conf-cmap-control-plane)# exit OS10(config)# policy-map type control-plane copp1 OS10(conf-pmap-control-plane)# class copp OS10(conf-pmap-c)# set qos-group 2 OS10(conf-pmap-c)# police cir 100 pir 100 View policy-map OS10(conf-pmap-c)# do show policy-map Service-policy(control-plane) input: copp1 Class-map (control-plane): copp Quality of service 455