To check OSPF topology, follow these steps:
1. Access the command prompt or terminal on your router or switch.
2. Enter the command “show ip ospf neighbor”. This will display all the OSPF neighbors that the router has connected to.
3. Verify that the neighbors listed are correct and that they have the correct OSPF area assigned. If there are any discrepancies, you may need to troubleshoot further.
4. Enter the command “show ip ospf database”. This will display the OSPF database, which contains information about the network topology, including the routers, networks, and links.
5. Check the output for any errors, such as mismatched area IDs or invalid LSAs.
6. Use the command “show ip route” to verify the routing table. This will show the routes learned through OSPF and whether they were learned from a neighbor or an external source.
7. Verify that all the routes are correct and that there are no missing or unwanted routes.
If you notice any errors, troubleshoot them by verifying the OSPF configuration and checking for any issues with network connectivity.
