Now, this may be a packaged tracer issue, but let's confirm that show ip protocols.
We are running OSPF on this router.
It's enabled on all interfaces.
Can we ping rather three?
Yes, we can show ip ospf neighbor.
The neighbor relationship is full.
The loopback address is configured.
OSPF is running on all interfaces in area to show IP OSPF database.
We have two routers configured in area two, but notice it's still got the wrong router ID in the database.
So let's do a clear IP.
OSPF process to re-establish the neighbor relationships.
Relationship has now come up show IP OSPF database.
That looks better.
We've got rather three as a rudder in area two it still showing rather two.
But notice that age is very high and is incrementing so that will eventually time out.
Rather two is not configured in area to show IP protocols.
Router two is configured in area zero and area one.
So this is because of the incorrect router ID previously that will eventually time out.
But let's check if out of three.
He's learning about the loopback of router four.
Yes, it is.
So we got some sudden updates there to the database.
But router three can now ping router four.
That looks good.
Notice on router two we see that a OSPF neighbor went down and then it came up again.
But now that the network has settled down, we can ping router four.
We have the loopback of router four in the routing table show ip ospf database.
Shows us that we have rather one and rather two.
In area one there is one designated router in Area one and we've learnt about routes from other areas
such as the loopback of router four and we can ping the loopback of router four.
So to confirm that things are working, we can ping the loopback of router one, router two, router
three and router four.
And on right before we can ping the loopback of writer one, router two and router three, we've successfully
corrected the errors in this network and it's all working now.
We fixed the router ID on router three and we reset the OSPF process on router four to force things
to happen quicker.
Show IP OSPF database.
But it still has rather four in the OSPF database, but that's going to time out.
Notice how large the AG is compared to other routers in the OSPF database.
I hope you found that useful.
Make sure that you understand and can troubleshoot OSPF for the CCNA exam.