Next-Hop Verification for Static Routes Overview

You can configure either Bidirectional Forwarding Detection (BFD) or Response Time Reporter (RTR) probes to further control when a static route is installed in the routing table. Using either BFD or RTR, static route installation is based on two factors: whether the next hop to the specified destination is resolved, and whether an IP service running above the static route application is currently available.

Next-hop verification is useful for static route configurations in which the layer 2 and layer 3 interfaces are up and the next hop to the specified destination is available, but the IP services that run above the static route are currently unavailable. When the upper-layer IP services are unavailable, the router does not install the static route in its routing table.