[VIDEO LOGO]
So now, let's jump into trouble ticket 2.
This one again is going to be on OSPF topology 3.
But this time, we're looking towards router 5.
It says router 5 currently has no OSPF routes
in its routing table.
So we're going to have to jump over here and look at router 5.
Looking at our diagram, it looks like we're
going to be basically troubleshooting between router
5 and router 4.
So we'll check to see if router 4 has routes
and that sort of thing as well, but it
seems like the problem is generally
going to be in this area.
Maybe not.
Maybe router 4 doesn't have the routes either.
But let's just go ahead and check the situation here
and see what this situation looks like.
So let's start here on router 5, verifying the ticket.
Let's just do a show IP route OSPF.
And well, we can see that we do, in fact,
have no routes in the routing table on router 5.
So let's see if we have a neighborship with router 4.
We said that that might be an issue.
So let's do a show IP OSPF neighbor.
And as we can see, we have no neighbors either.
So this appears to be another neighborship issue.
So let's also take a look at our show IP OSPF interface brief.
And here we see a situation where
it appears that we only have our loopback 0
interface in the OSPF process.
Now, just to expand on this show IP OSPF interface
brief a little bit or show some alternatives,
there's also show OSPF interface brief.
But we need to be a little bit careful here.
Notice that this is showing me gigabit 2 and loopback 0,
but these are actually for the address family IPv6.
If you actually say show OSPF question mark, what we're
actually typing is show OSPFv3.
So what's interesting about this is if I were to say show OSPF--
and by the way, there's a choice here for IPv4.
But if I say IPv4 interface brief,
this still won't show our interfaces
because this would be OSPF version 3 IPv4 enabled
interfaces.
Now, if we were to change IPv4 to IPv6.
Well, this is the same command we typed earlier essentially.
We just left out the IPv6.
So this will show us the IPv6 enabled interfaces
or more specifically, the OSPFv3 enabled interfaces.
But again, in our case, we're trying
to run OSPF version 2 for this and we
don't have any interfaces enabled for IPv4
for OSPF version 3 anyway.
But this brings us back to the fundamental problem
that gigabit 2 is, in fact, not enabled for OSPF version 2.
So this is what we're going to need to fix.
Now, this is another situation where we have a couple of ways
that we could fix this.
We could, of course, use a network statement
under the OSPF process or we could enable it
under the interface.
I personally generally prefer to configure it
under the interface.
It's a little bit more exact, a little more precise control.
So that's what we'll go ahead and do.
So we'll simply go into interface, gigabit 2.
We'll say IP OSPF 1 area 0.
Exit configuration.
Let's look at our interfaces again.
We see that now gigabit 2 is, in fact,
enabled for OSPF version 2.
We also see out here it's listing a neighbor,
so let's verify that as well.
We do our show IP OSPF neighbor.
We see that, in fact, neighbor 4 is now up.
And if we do a show IP route OSPF,
we see that we now have a couple routes in our routing table.
Now, again, the routing table isn't real populous just yet.
We have just the two routes.
But before, we had none.
So this should be the problem that was being
referenced in this ticket.
It really looks like we solved it because we do now
have routes on router 5.
So here, we saw an example of simply not having
the correct interfaces enabled for the correct protocol.
I hope this has been informative for you,
and I'd like to thank you for viewing.