At the moment, rather one is able to ping or out of five acting as PC two.
And that's because we've configured a tunnel.
But we've also configured ERP to learn remote routes.
So ERP has learnt about network ten 120 via ten 132 through Tunnel zero.
So if we removed ERP, rather, one would no longer be able to ping right of five.
Because rather to has no route to get to that network.
It can send the traffic of via rider three, but rather three also has no visibility of that network.
So on router three, show IP route shows us only directly connected interfaces.
So in this example, it's enable OSPF so rather OSPF one network.
And I'll once again only enable OSPF on network ten, not on network four.
Show IP OSPF interface.
And let's do a brief.
OSPF is enabled on tunnel zero and on Fost Ethernet zero zero.
Notice the cost is very high and it's a point to point link.
We need to configure router for router four.
So the neighbor relationship go down to router two when we remove the IGP.
So now let's remove Ethiopia and rather for.
And enable OSPF so network ten 000 with the relevant mask show ip ospf interface brief before presenter
notice the neighbor relationship has already come up.
You can see tunnel zero and Foster Ethernet zero zero have OSPF enabled on them.
So IP OSPF neighbor neighbor relationship to ten 131 is full notice.
It's a point to point link so we don't see any election taking place but rather for now has a relationship
directly to rather two through tunnel zero.
So show IP route.
We have now learnt about a Route ten 110 through OSPF from this neighbor rather to through tunnel zero.
So can router one now ping router five and the answer is yes.
So we've successfully changed the writing protocol used across the jury tunnel from IP to OSPF rather
one can trace as an example to router five.