Configuring Copp For Cpu Queues - Dell Z9500 Configuration Manual

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 rate-police [rate-kbps] [burst-kbytes] peak [rate-kbps] [burst-
kbytes]
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 queue-number qos-policy name
On the Z9500, the range of queue-number values is from 0 to 23. The twenty-four control–plane queues are divided into
groups of eight queues for the Route Processor, Control Processor, and line-card CPUs as follows:
• Queues 0 to 7 process packets destined to the Control Processor CPU .
• Queues 8 to 15 process packets destined to the Route Processor CPU.
• Queues 16 to 23 process packets destined to the line-card CPU.
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 input-policy-map
Examples of Configuring CoPP for CPU Queues
The following example shows 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
The following example shows assigning the QoS policy to the queues.
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
The following example shows creating the control plane service policy.
Dell#conf
Dell(conf)#control-plane
Dell(conf-control-plane)#service-policy rate-limit-cpu-queues cpuq_rate_policy
Control Plane Policing (CoPP) 220