Chapter 5. Implementing High Availability

A highly available network is the goal of every network engineer. Having a highly available network makes the job easier because it helps to prevent network outages and minimize downtime.

Components of High Availability

There are five components to high availability: redundancy, technology, people, processes, and tools. The first two can be obtained through network design; the last three are more difficult to implement and control.


Redundancy attempts to eliminate single points of failure by providing duplicate devices and links. This costs more, so the added cost must be balanced against the added benefit. Add redundancy where it will have the most ...

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