Understanding the Control Plane

This section reviews what you can do to protect network devices in the event of attacks involving traffic directed to (nontransit traffic) the network device itself.

The route processor, the CPU on a router, can only do so much. So, whenever possible, the router is going to cache information about how to forward packets (transit packets going from one device on the network to some other device). By using cached information when a packet shows up that needs to be forwarded, the CPU has to expend little effort. Forwarding of traffic is the data plane, and that is what really benefits from using cached information.

So, what has that got to do with the control plane? If a packet, such as an Open Shortest Path First ...

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