If a link failure occurs on a network with IGP (OSPF for example), static, and blackhole routes, static routes may be iterated to a blackhole route to remain active. Static routes are preferentially selected over OSPF routes because they have a higher priority. Although active, the static routes are unreachable because they have been iterated to a blackhole route, resulting in service interruptions.
To address this problem, prevent static routes from being iterated to a blackhole route so that OSPF routes will be preferentially selected.