Floating Static route

A floating static route is a static route with an administrative distance higher than that of the routing protocol in use. In this way, the floating static route will only appear in the routing table if the dynamically learned route is lost.

Actually it is a backup for the Dynamic routing protocol route.

To change the Administrative Distance of a static route to 250:

RouterA(config)# ip route 172.18.0.0 255.255.0.0 172.17.1.2 250

Static routes will only remain in the routing table as long as the interface connecting to the next-hop router is up. To ensure a static route remains permantly in the routing table, even if the next-hop interface is down:

RouterA(config)# ip route 172.18.0.0 255.255.0.0 172.17.1.2 permanent

Static routes can additionally be used to discard traffic to specific networks, by directing that traffic to a virtual null interface:

RouterA(config)# ip route 10.0.0.0 255.0.0.0 null0

For Further Studies please check the following Links:-

Basic Video to understand the Floating Static route further, Please visit the Following Youtube Link
http://www.youtube.com/watch?v=jNN4Xt59pJ8

Showing Floating Static route in a Design
http://mp3king.froggypwns.com/Tcm%20266%20Hassan%20Marzouk/Lab%20manual/Pdf/Lab%203%5B1%5D.6.4.pdf

Sample Configuration PDF's
http://www.cisco.com/image/gif/paws/10212/5.pdf


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