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FLOATING STATIC ROUTE



A floating static route or backup route is a route that has a higher administrative distance then the current route in a routing table. The routes that have a lower administrative distance number will be the ones installed into the routing table whereas higher AD numbers will not.

By default a static route is always used rather than a routing protocol. By adding an AD number in our IP route statement, however we can efficiently create a backup route to our routing protocol. If our network is using OSPF and we need a backup route, add a static route with an AD greater than 110. OSPF will be used because its AD is better (lower) than the static route. If OSPF goes down, however the static route will be used in its place. This is known as a Floating Static Route.



On router R1

routerospf 1
network 1.1.1.1 0.0.0.0 area 0
network 10.1.12.0 0.0.0.255 area 0
ip route 2.2.2.2 255.255.255.255 10.1.12.2111
ip route 3.3.3.3 255.255.255.255 10.1.12.2 111
ip route 10.1.23.0 255.255.255.0 10.1.12.2 111


On router R2

routerospf 1
network 2.2.2.2 0.0.0.0 area 0
network 10.1.12.0 0.0.0.255 area 0
network 10.1.23.0 0.0.0.255 area 0
ip route 3.3.3.3 255.255.255.25510.1.23.3 111
ip route 1.1.1.1 255.255.255.255 10.1.12.1 111


On router R3

routerospf 1
network 3.3.3.3 0.0.0.0 area 0
network 10.1.23.0 0.0.0.255 area 0
ip route 2.2.2.2 255.255.255.255 10.1.23.2 111
ip route 10.1.12.0 255.255.255.010.1.23.2 111
ip route 1.1.1.1 255.255.255.255 10.1.23.2 111








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