In Modular Quality of Service (MQC), the statement class-map defines the name of the classes. It consists of one or more match statements that includes the classification of the packets. The keyword match supports the following items:

• Can contain access-control lists
• Can contain the IP type of service packets
• Can contain ARP protocol packets

The following steps show the configuration of CoPP:

The following commands show how to configure a control-plane policing to reduce the ARP traffic sent to Router A to 75% and to drop the Telnet traffic from Router C to Router A.

The first step is  create a class-map for the ARP traffic and Telnet, then create a policy map and apply the policy map to the control plane:

RouterA(config)#class-map ARP
RouterA(config-cmap)#match protocol arp

After the creation of class-map that matches the ARP protocol, create a policy map to reduce the packets to 75% per second:

RouterA(config)#policy-map POLICY
RouterA(config-pmap)#class ARP
RouterA(config-pmap-c)#police rate ?
 <1-2000000000> Rate value in the range 8000-2,000,000,000 bps or 1-2,000,000
 pps
 percent % of interface bandwidth for rate
RouterA(config-pmap-c)#police rate 75 pps
RouterA(config-pmap-c-police)#exit

Now the ARP protocol on RouterA is reduced to 75% packets per second.

The next step is to create an access-list to group the Telnet packets:

RouterA(config)#ip access-list extended TELNET
RouterA(config-ext-nacl)#permit tcp host 192.168.22.2 any eq telnet
RouterA(config-ext-nacl)#exit
RouterA(config)#class-map TELNET
RouterA(config-cmap)#match access-group name TELNET
RouterA(config-cmap)#exit

Then, configure policing for the TELNET class map you created:

RouterA(config-pmap)#class TELNET
RouterA(config-pmap-c)#?
QoS policy-map class configuration commands:
 bandwidth          Bandwidth
 compression        Activate Compression
 drop               Drop all packets
 exit               Exit from QoS class action configuration mode
 netflow-sampler    NetFlow action
RouterA(config-pmap-c)#drop
RouterA(config-pmap-c)#exit
RouterA(config-pmap)#exit
RouterA(config)#control-plane
RouterA(config-cp)#?
Control Plane configuration commands:
 exit                          Exit from control-plane configuration mode
 no                            Negate or set default values of a command
 service-policy                Configure QOS Service Policy
RouterA(config-cp)#service-policy input POLICY
RouterA(config-cp)#exit