White Papers

Table Of Contents
Control Plane Policing (CoPP)
Control plane policing (CoPP) uses access control list (ACL) rules and quality of service (QoS) policies to create filters for
a systems control plane. That filter prevents traffic not specifically identified as legitimate from reaching the system control
plane, rate-limits, traffic to an acceptable level.
CoPP increases security on the system by protecting the routing processor from unnecessary or DoS traffic, giving priority to
important control plane and management traffic. CoPP uses a dedicated control plane configuration through the ACL and QoS
command line interfaces (CLIs) to provide filtering and rate-limiting capabilities for the control plane packets.
The following illustration shows an example of the difference between having CoPP implemented and not having CoPP
implemented.
NOTE: The purpose of the following illustrations is to showcase the effect on a network when CoPP is implemented against
a scenario when CoPP is not implemented. The number of queues shown in the figure do not match the actual number of
queues (12) that are supported on the platform.
Figure 27. Control Plane Policing
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