Route management redundancy provides redundancy in case the next-hop gateway (the router) becomes unreachable.
When you configure your Ethernet interfaces, you specify a default next-hop gateway (router) in your default Ethernet interface configuration. You can then configure additional Ethernet interfaces with static routes to different next-hop gateways. The CTP device monitors the reachability of the next-hop gateway. If the gateway becomes unreachable, the CTP software removes the configured static route to the gateway from its routing table.