If you think the wrong route has been added to your routing table and you want to check it out, you first have to remove that route from your table before seeing if it is added back in or not. You can clear all or some OSPF neighbor connections (sessions) using the execute router clear ospf command. The exec router clear command is much more limiting for OSPF than it is for BGP. See “Clearing routing table entries”.

For example, if you have routes in the OSPF routing table and you want to clear the specific route to IP address 10.10.10.1, you will have to clear all the OSPF entries. Enter the command: