no router-id ip-address
ip-address Router ID in IP address format.
To use a fixed router ID, use the router-id command in router configuration mode. To force OSPF to use the previous OSPF router ID behavior, use the no form of this command.
You can configure an arbitrary value in the IP address format for each router. However, each router ID must be unique.
If this command is used on an OSPF router process which is already active (has neighbors), the new router-ID is used at the next reload or at a manual OSPF process restart. To manually restart the OSPF process, use the clear ip ospf command.
The following example specifies a fixed router-id:Router(config-router)# router-id 10.1.1.1
clear ip ospf
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