What is one reason to implement Control Plane Policing?

CoPP does not enable OSPF to advertise routes - OSPF functions independently; CoPP simply limits how many OSPF packets per second reach the CPU.

CoPP uses Cisco MQC policies applied to the control plane to police the rate of packets punted to the route processor, preventing CPU exhaustion from DoS attacks, traffic floods, or misconfigured devices. By limiting the rate of specific traffic classes (OSPF, BGP, ICMP, etc.) destined for the CPU, the router remains able to process legitimate control traffic and maintain routing stability. Without CoPP, a traffic flood can starve the route processor and cause routing protocol failures.

Network devices generate and receive packets regardless of CoPP - that is a fundamental function not governed by policing policy.

CoPP explicitly protects the control plane (CPU/route processor), not the data plane, which is handled by forwarding ASICs.