A network administrator configures a router with `router ospf 1`, then issues `router-id 10.10.10.10` under the OSPF process, but the router already has a loopback interface configured with IP address 1.1.1.1 and a physical interface with IP address 172.16.1.1, both already active before the `router-id` command was entered. Assuming OSPF has already formed adjacencies using the previously derived Router ID, what must the administrator do for the new Router ID to take effect?
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