OSPF in Virtual Link Topology

CCIE v5.1: Learn the Details of OSPF and its Implementation CCIE v5.1 Learn the details of OSPF and its implementation
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Transcript

Hello this is your host Habib's career and we are going to start with this new topology topology for and we will be discussing about OSPF virtual link. Now, as you know, OSPF is available by using areas and areas zero is usually the backbone area and the intent of this topology is to make sure that it is zero router can reach alias to router that which is r four and and full convergence will be established between the between the routers. Having said that in this topology also if you notice r two and r three are basically known as AP art routes. Which are area border routers these are the routers that update the neighboring routers and and send them the link state advertisements about other routers in different areas. So basically there are three tasks here and hopefully we can cover all three of them in this topology and establish proper communication between r one and r three r four, r three and r two.

So, let's start it Okay, so I just brought up r one and r two and r three and r four basically there is no configuration in them right now. So the idea is Really to create loopback address in r one r two r three and r four as well as connect the serial interfaces create Point to Point connection between the routers and and run OSPF process one and configure the interfaces in the right areas. Okay, so follow along and let's configure the interfaces right now. In our one we will choose interface, zero slash zero. We'll use an IP address. Let's give it 11 dot one dot one top 1255255 2.50 no shot and We will also create another interface which is zero and IP addresses give it to one dot one dot one dot one and of course okay.

So we will we will, let's add a routing protocol as well. So router, OSPF one and network, one dot one dot 100101. More thing we need to add is the router ID. That's curious. You don't So show my face please. Those are the routers.

Those are the interfaces and they are up and we have added the OSPF information into it. Let's bring up the console for r two. And we will exactly do the same thing. Let's try to put it here right above our one more problem called t interface, zero slash zero 11 oh 101225525520 loopback addresses IP address. To talk to talk to okay. Five oh and we have another interface as well which is zero slash one IP address we will choose will be 223 23 dot 101 dot 152 point five to know brief.

So we have here three IP addresses for three interfaces one, give it a router ID of two network 11 dot one dot one dot two area area we know this interface will belong to area zero network to talk to talk to one another interface that we give which is I believe 23 one and this one Okay, so we have configured that we can see it created an adjacency already with r1 which is good. Now let's move to our three and we will do exactly the same thing. interfaces to slash one IP address 23 dot one dot one dot 22552250 interface loopback address zero and we will give it an IP address of three dot three dot 325 524-525-5255 and there will be another interface here as zero slash zero Let's name this 34 ip ip address 34 dot one dot 1-255-255-2250 I mean let's give it an IP address of 34 dot one dot one dot one since it's a link between our three and our four remember now let's move to our four.

Oh, we haven't given the we should give it the router information as well router OSPF one and so the first network would be the loopback address and I believe 23 dot want to And then there is another network which is 30 411 router ID of zero. Now, the reason why I did this is to show you that when you apply dollar idea at the later stage you have to actually clear the IP process for the OSPF. So we have to clear it so clear. IP OSPF should actually create agency again periodic table. So part three is up. Now.

Now let's do the same thing to our four. And let's pick it up. interface zero slash zero. I believe the IP range for this interface is 34 dot one dot one dot 255255 to zero. In the routers you have to always apply notional because the interfaces are always shut off inter interface loopback zero let's get an IP address on port 4255255 No shutdown database loopback but it automatically, it's always up because it's a loopback interface. I believe that's about it and our fault we just have to add the router IP information for up to five five to get along deck.

Area to another network is 34 dot one dot one dot one dot zero. I can see there's an adjacency formed. So show IP OSPF. IP route OSPF. Okay. So as you can see there's the art or is able to see our three.

But it's not able to see beyond beyond that it's not able to see the routing table in our two or r1. So I don't think it can do that to talk to which is the loopback address part two, because it's not their same thing. If we look at our one, and we do show IP route OSPF. So basically our walk can see our two our two can because it's its neighbor so it can see the routing table too but it cannot see beyond that right now. Usually a two should be connected to area zero as well as area one should be connected to area zero area one is clearly showing as it as it says it's connected to zero because of the ARCHOS behaving as an area border router here. And our trees also behaving area border router here between areas zero and two.

So we look at our trees routing table I can see there's two inches carriers entries here to routing IP addresses that are coming from the inter region. So it's one dot one dot one, one dot one dot one is the loopback of r1 and 11 dot one dot one dot zero. So in order for r1 to communicate to our four and our four to communicate to r1, we would need to create the virtual link. And I'll be showing you here how to do that. Let's minimize r one r four, and let's just go to r two. So in our to, what we usually do is what we can do is turn Create a direct link and use a one as a transitive one.

Virtual link two three that's the router a router ID of router three. So that's done. Now let's go to our three process which is router or virtual bank. You we just got to test the router I P four r two. Now by actually, if you look at the messages I'm getting here are three, it says that there's an OS pf here. Virtual links tablished.

The message here that I'm getting and the routing table is now updating itself. Okay, so that's good. And now let's see our wants routing table. So as you can see previously we have put in the routing table before the virtual link we were carrying on to inter area increase. So if I do show IP route OSPF. You can see I'm getting more interior links and I can see The router force subnets.

So if I ping now if I try to ping the loopback address in r four and I can ping that. Let's verify the same thing with our four in our four here. So, if I do show IP route OSPF, I can see the same inter in links and I should be able to ping the loopback address for our one there you go. So with this we conclude the topology for configuration and and yes, OSPF is scalable, and the area backbone can be connected to other areas within an organization. As you can see And I hope you have enjoyed this lecture. Thank you very much and join me for other lectures.

Thank you. Bye bye

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