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Practical BGP by Sangli Srihari, Russ White, Danny McPherson

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BGP Graceful Restart

A large number of the larger-scale routers used in networks, such as the Cisco 12000 and Cisco 10000, separates the control plane from the data plane; in other words, the control plane is not involved in the processes required to switch packets from one connected segment to another. Figure 7.6 illustrates this concept.

Figure 7.6. Separation of forwarding and control information.

If the control plane could restart without impacting the data used by the data plane, it should be possible to install new software, replace certain pieces of hardware, and perform other such tasks without causing the network to lose routing through ...

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