Hello, this is your host Javier Korea and in this topology I will be showing you step by step process of how to configure OSPF authentication. So let's start right away and get this configured and achieve these two tasks. interfaces to serial 00 and I think put that one IP address 10 dot one dot one dot one 255-255-2552 or two, phase zero. The other two phases is zero. That's the one facing od one. Time one dot one dot two To find another interfaces here's rashwan address let's make it 15 dot one dot one are three serious questions facing our to address Okay, so perfect so we have configured the interface interfaces and we have brought them up now we will Now we will create the route enable OSPF.

So let's do that. And we will give it router IDs as well. OSPF one router r1. One dot one router ID. And so we have two interfaces. Here's your network.

Another network here which is level one We will have to put the OSPF process the same everywhere router ID would be two as we, as it believe that that is the right one just to identify the router. So here we have three interfaces so zero So we can see their distances from between r two and r one which is good. Let's go to r three and we will do the same thing. And we can see establishing a relationship with her too. So that's great. So if I do show IP route Yeah.

I can see it seeing the routing table, it's getting updated. So IP OSPF neighbor can see the neighbor. And he can probably ping 10 dot 10 dot 10 dot 10 from our tree which is the loopback address of our one. So our first task here is to configure OSPF Education using a clear text and the password should be CCIE. So as indicated I mean you can apply 20 occation at the global level first we have to tell that there will be an authentication that will be used when we enable OSPF. And then the password has to be applied at the interface level.

So in case of r1 will apply at the serial interface zero slash zero. In case of r two we will apply that material interfaces as zero slash zero as well as zero slash one. And for our three we will apply it at zero slash zero slash one. So we will go through this, this process step by step and and hopefully we can achieve Quickly. So, router OSPF one first thing we have to do is we know the zero and we will say great. And after that we will do interface serial zero slash zero.

And we will apply the OSPF authentication and we'll call it PCI. That's all we have to do. So let's move to now if you see actually there's the neighboring relationship has ended. The reason is we are planning authentication on r1 and we did not do it in our two so the routing the neighboring relationship cut off the adjacency between the two routers. So let's do the same thing on our 210 occation interface zero slash zero to IP OSPF authentication attempting to add the interface zero slash one, IP OSPF authentication, the CCI So as we were applying the key, the neighboring relationship was it was established between r two and r one. But as we applied the key to the interface s zero slash one neighboring relationship between r two and r three expired for it came down basically So, so let's move to let's move to our tree and do the same thing.

One is here interface zero spot One IP CCIE There you go. So we have so we can see there is a routing table back to his neighbor and yes, so, we completed in this case, task one, we will move on to the next task. Okay, so our task number two is configured mt five authentication Using Cisco or with Cisco, MT five is basically message digest key and the key will be Cisco. So let's do that. One thing we have to do is we have to remove the the previous configuration and we have to basically redo the certification type. So if I to show running config.

So router OSPF one so let's to know Zero No. Okay, so now we have to tell area zero we'll be using authentication but zero authentication will be basically message digest and if we go ahead and show you know we need to remove For SPF authentication, we will use it or actually message digest digest mt five sorry, MT five so that's what we will do on all the all the routers Actually we could have just said here's your authentication and you get the message digest so in the article, we have a basis Hi So as you can see as we're changing the authentication the HSS is forming which is great. Okay, so our trace is up here and let's go change the settings on the router OSPF one and we will do the same thing. Carrier zero authentication with the message digest interface slash one say no bye authentication CCIE IP message stages D five and I'll call it so now all the routers are using the same authentication method and password or key and that's the reason they can form adjacency.

So, if I do show IP route here, I can see it can ping the loopback address it can see the loopback address on r1 or three can see the loopback interface on r1. And we know then full convergence is established between all the three routers in this regard. So, we have to have completed this topology tasks and we will move on to the Next topology and I hope you can join me. Thank you very much