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Routing TCP/IP, Volume I (CCIE Professional Development) by Jeff Doyle

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Static or Dynamic Routing?

When reading (or being lectured about ) all the glorious details of dynamic routing protocols, it's hard not to come away with the impression that dynamic routing is always better than static routing. It's important to keep in mind that the primary duty of a dynamic routing protocol is to automatically detect and adapt to topological changes in the internetwork. The price of this “automation” is paid in bandwidth and maybe queue space, in memory, and in processing time.

A frequent objection to static routing is that it is hard to administer. This criticism may be true of medium to large topologies with many alternative routes, but it is certainly not true of small internetworks with few or no alternative routes. ...

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