Okay, so we're moving on to complete the tasks that are topology number two. The first basically once we have built it apology now is to we have to start adding OSPF, OSPF protocol. And we'll start by configuring tunnel interfaces and making it ready for OSPF point to multipoint. Okay, so let's do that. So on r1 we have to go to call t interface, terminal one. And the first thing we will do is we will have to enable OSPF.
Netbook point to multipoint we will do the same thing on all the routers interface, tunnel one, IP voice peer network, point to multipoint. Same thing here with our three as well. interface just bring it up face perfect So now what we will do is we'll run OSPF, router OSPF one, router it, one to one dot one is to show IP interface brief show IP interface brief. So we have the interfaces here. So we're still in the OSPF mode. So, network.
Our first network is 101 dot one dot one 00 Okay, now let's go into face proof. Same thing will apply router voice peer network is going to be area zero is another network here which is 21 router three we have to apply to we have to define OSPF under these networks. Now that we have ran the OSPF router protocol on all the routers, one thing I need to see is show IP OSPF neighbor. So, as you can see here there is no neighbors established between the three there is a reason and the reason is the adjacency did not fall because basically multi month multicast was not allowed in the tunnels configuration. And we have to allow that. So, as you can as you know the routers use 224 dot zero dot zero dot five to send their Hello pack Hello packets to the Bring device.
So, we will have to do that and allow the allow the IP n HRP map multicast command on all the on all the tunnels. So let's do that and then we will see they will appear neighboring and there will be a neighboring adjacency established between the routers, okay. So if I do show interface show running show run interface tunnel one as you can see, I mean I don't have anything here that's that shows multicast at all. All right, so let's add that interface and this is really a very important important aspect of it that so we have to Consider when we are doing dmvpn in OSPF via IP nh RP or any eigrp as well as the same thing, multicast 192 168 dot two dot two IP in HRP map, multicast 192 168 dot two dot two and there's the second byte here which is multicast 192 dot 168 dot three dot three.
Let's do the same thing here. Face one plus one IP n HRP map for part two, which is our 192 168 101 192 168 dot one dot one Okay, so in this case we have grantee IP n, HRP map multicast and we have assigned the, the NVMe IP addresses of the neighboring devices. So let's see if there's an OSPF that has established here. So show IP OSPF neighbor and yes indeed we are seeing the neighbor same thing in our two four to show IP OSPF neighbor I do see it p OSPF paper. Okay. So basically we can see OSPF Is converged fully.
So if I go back to our three I'm not sure why it was taking time. But it did converge finally. So, when I did show IP OSPF neighbor, you can see tablished the neighbor ship relationship with r one and r two established a neighbor relationship with r1. And and r1 has also establish r1 has established a relationship with r one and r two. Okay, so we verified That now we are going to move to the last task which is basically to find the best path to switch number to VLAN 24 which is three which is switch the bottom here this one that has VLAN 24 perfect. So, if I look at our one show IP route OSPF.
So to reach r1 this switch is doing voice peer is doing equal load balancing as you can see, basically to be on 24 for you to reach it. It can take It will go through this part as well as through our part two, it will go through R three and r two. So um but we don't want that what we want is basically the traffic goes through hard three only. And our two can the Pat or two can can come up in case our three has a failure, which is basically what is common nowadays. For some reason and can we just because the network still conversion again Okay, so let's do that 10 so the first thing we need to do in this case is basically what we need to do in all the routers is on the tunnel interface. We will make the tunnel interfaces non broadcast network type.
Okay. So let's start out by doing that by configuring the tunnel interface from one we'll change it to voice. Tie network point to multipoint. It is point to multipoint. Anyway, but by default layer two and when it comes to us via layer two, it's always in a podcast. fashion.
So we have to make it on broadcast right channel one right here to point non broadcast care 1.22 point non broadcast. This will regenerate topology to go up and down but it will The routing table will I can update itself eventually. So that's good. We have done that now let's exit our to our tree. Now let's come back to our one because most of the work is going to be done here to basically we will put a command called neighboring command. So we know what is neighbor for the neighbors for our one but we will also change the cost.
So router OSPF one can say neighbor our first give the link to our to a higher cost. So that is 100 on top on top and the cost is 20 as to that and the neighbor hundred dot three which is our fee basically causes. So, higher cost means slower link or smaller bandwidth, lowest costs one means higher bandwidth. So now if I look at the routing table show IP OSPF I can see to get to to get to VLAN 24 or network 24. I'm going to on dot three, which is basically our three. I think it's still loading, but still loading.
Let's give it a minute. Okay, so basically this is the way it's done by increasing the cost on the lower on the link that has a lower bandwidth and reducing the cost On the link as a higher bandwidth will basically make the OSPF choose the link with the highest bandwidth as the preferred route for the traffic. So that's what we wanted to establish and this is what we achieved. I think we are good for now. There's nothing to add to this topology. I hope you have enjoyed.
And we will be moving on to the next topology, topology three. And so please continue with me. Thank you very much. Bye bye