Description

The control plane in an Open Systems Interconnection (OSI) Layer 3 device provides traffic routing functions by building the device routing and forwarding tables. This often involves cooperation with nearby devices using dynamic routing protocols. These interactions must be controlled in multiple aspects by authenticating the associations between devices, discarding malicious routing information, and protecting the resources of each device against excessive use. This course examines a number of defenses in Cisco IOS Software that protect the control plane: infrastructure access control lists (ACLs), Control Plane Policing (CoPP), Control Plane Protection, routing protocol authentication, and routing protocol information filtering.