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IP Routing Primer by Robert Wright

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Using Floating Static Routes

Floating static routes are static routes that are always in the configuration of a router but are only installed in a routing table when a dynamic route to the same network is lost. The dynamic route overrides the static route because the static route is configured with a greater distance. The concept of distance was introduced in the section on metrics and distances in Chapter 2.

This type of static route can be used when the alternative link is a dial-up connection. Dynamic routing information is not usually sent or received over a dial-up link unless the link is intended to be up for a long period of time. Remember that dynamic routing protocols send updates at regular intervals, causing the link to go up ...

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