Floating Static Routes

By changing the AD of a static route, you can make it less preferred than routes learned by a dynamic routing protocol to the same destination (make sure the AD is higher than the routing protocol's AD!). This is called a 'floating static route'.

The route will be inactive (not in the routing table) unless the route learned by the dynamic routing protocol is removed (for example, the remote router stops advertising it for some reason, or an interface failure causes an adjacency with a neighbor to be lost).