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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Configuring CoPP for CPU Queues

Controlling traffic on the CPU queues does not require ACL rules, but does require QoS policies.

CoPP for CPU queues converts the input rate from kbps to pps, assuming 64 bytes is the average packet size, and applies that rate to the corresponding queue. Consequently, 1 kbps is roughly equivalent to 2 pps.

The basics for creating a CoPP service policy is to create QoS policies for the desired CPU bound queue and associate it with a particular rate-limit. The QoS policies are assigned to a control-plane service policy for each port-pipe.

  1. Create a QoS input policy for the router and assign the policing. CONFIGURATION mode qos-policy-input name cpu-qos
  2. Create an input policy-map to assign the QoS policy to the desired service queues.l. CONFIGURATION mode policy-map--input name cpu-qos service-queue 0 qos-policy name
  3. Enter Control Plane mode. CONFIGURATION mode control-plane-cpuqos
  4. Assign a CPU queue-based service policy on the control plane in cpu-qos mode. Enabling this command sets the queue rates according to those configured. CONTROL-PLANE mode service-policy rate-limit-cpu-queues name

Example of Creating the QoS Policy 

Dell#conf
                                 Dell(conf)#qos-policy-input cpuq_1
                                 Dell(conf-qos-policy-in)#rate-police 3000 40 peak 500 40
                                 Dell(conf-qos-policy-in)#exit
                                 
                                 Dell(conf)#qos-policy-input cpuq_2
                                 Dell(conf-qos-policy-in)#rate-police 5000 80 peak 600 50
                                 Dell(conf-qos-policy-in)#exit
                              
Dell(conf)#policy-map-input cpuq_rate_policy cpu-qos
                                 Dell(conf-qos-policy-in)#service-queue 5 qos-policy cpuq_1
                                 Dell(conf-qos-policy-in)#service-queue 6 qos-policy cpuq_2
                                 Dell(conf-qos-policy-in)#service-queue 7 qos-policy cpuq_1
                              
Dell#conf
                                 Dell(conf)#control-plane
                                 Dell(conf-control-plane)#service-policy rate-limit-cpu-queues cpuq_rate_policy

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