Configuring Copp For Cpu Queues - Dell S4820T Configuration Manual

The following example shows matching the QoS class map to the QoS policy.
Dell(conf)#policy-map-input egressFP_rate_policy cpu-qos
Dell(conf-policy-map-in-cpuqos)#class-map class_ospf qos-policy rate_limit_500k
Dell(conf-policy-map-in-cpuqos)#class-map class_bgp qos-policy rate_limit_400k
Dell(conf-policy-map-in-cpuqos)#class-map class_lacp qos-policy rate_limit_200k
Dell(conf-policy-map-in-cpuqos)#class-map class-ipv6 qos-policy rate_limit_200k
Dell(conf-policy-map-in-cpuqos)#exit
The following example shows creating the control plane service policy.
Dell(conf)#control-plane-cpuqos
Dell(conf-control-cpuqos)#service-policy rate-limit-protocols
egressFP_rate_policy
Dell(conf-control-cpuqos)#exit

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
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
Control Plane Policing (CoPP)
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