![]() ![]() Let’s shut the OSPF process on R1: R1(config)# router ospf 1 Right now, these two routers are OSPF neighbors: R1# show ip ospf neighbor I will use these two routers that are running OSPF: This will trigger other OSPF router to fall back to init state. Send hello packets with the DR/BDR set to 0.0.0.0 and an empty neighbor list.Flood updated LSAs where all information (prefix, neighbors) from the selected interface is removed.Drop all neighbor adjacencies on the interface you selected.If you shut OSPF on the interface level with the ip ospf shutdown command, it will do this: This will trigger other OSPF routers to fall back to init state. ![]() Flush all LSAs that the router originated by setting the age to 3600 seconds.If you want to do a graceful shutdown globally, you have to use the shutdown command under the OSPF process. You can do this globally or on the interface level. This allows you to gracefully stop the OSPF routing process without removing the configuration from your router. Similar to using the shutdown command on an interface, there is also a shutdown command for OSPF. ![]()
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