Cisco Cisco IOS Software Release 12.4(4)T

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The Control Plane Protection feature is an extension of the policing functionality provided by the 
existing Control-plane Policing feature. The Control-plane Policing feature allows Quality of Service 
(QoS) policing of aggregate control-plane traffic destined to the route processor. The Control Plane 
Protection feature extends this policing functionality by allowing finer policing granularity.

The functionality added with Control Plane Protection includes a traffic classifier, which intercepts 
traffic and classifies it into three control-plane categories. New port-filtering and queue-thresholding 
features have also been added. The port-filtering feature provides for policing of packets going to closed 
or nonlistened TCP/UDP ports, while queue-thresholding limits the number of packets for a specified 
protocol that will be allowed in the control-plane IP input queue.

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12.4(4)T

This feature was introduced.