Implementing Cisco IP Routing (642-902 ROUTE) Tutorials
Advanced OSPF / Lab 2 - Point-to-Multipoint Network pt. 1
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Subtitles of the Movie (Implementing Cisco IP Routing (642-902 ROUTE) / Advanced OSPF / Lab 2 - Point-to-Multipoint Network pt. 1)
So welcome back in to the OSPF Lab. We've configured Area 0 and 42 and we're now going to step into configuring Area 51. Now Area 51 is one of the more complex areas of our, of our little lab network here and the only thing that makes it complex, is all of the little OSPF tweaks and changes you have to make, to make OSPF fit the requirements of the objectives. Speaking of the objectives, let's go look at them and make sure that we're going to meet all of the requirements. So you'll see here in objective one, where it says the East Router should be configured as the RFC standard Point-to-Multipoint network type, but no other routers in Area 51 maybe configured with an IP OSPF Network Command. Now that comes into play here in about two minutes when we're setting up the East Router. Now I will make the point of saying that Frame Relay is functioning and configured properly here in the East area, this Area 51 so whatever issues we come across are not due to a Frame Relay Configuration issue and if you're trying this at home or if you have tried it and you couldn't make it work, I'll, I'll show you some of the little gotchas that you may not have thought about it. I know I didn't think about them until I, I put this lab together. So let's go over to the East Router and this is the interface that we're going to advertise into Area 51 because we've already advertised this Loopback Interface into Area 0. So we'll do a Config T, we will do Router OSPF one and we're going to do Network 192.168.3.0 0.0.0.255 Area 51, 51. And so now let's go and check out the Show IP OSPF Interface, so Show IP OSPF Interface just to make sure that OSPF advertising as we expect it. There's the Loopback and it's a Point-to-Point network as we expect, there's the serial 0 slash 0.1. It's in Area 0 and it's a Non-Broadcast as we've configured and as we expect. Let's look here at serial 0 slash 1.1. It is in Area 51, it says it's a type of Non-Broadcast and the reason that it's a Non-Broadcast Network, if we do a Show Run Interface Serial 0 slash 1.1, we'll see that Interface Serial 0 slash 1.1 is a Multi-point Interface just like all the interfaces up here in Area 0 and that's because it's a Multi-point on this end but if we were go to Boston and Newark, they would be Point-to-Point just because that's the way Frame Relays configured in this particular implementation. And it's a fairly common implementation, I run across a lot of WAN networks where it's a Point-to-Multipoint network just like this. It's Multi-point at the hub and it's Point-to-Point on each of the spokes, that way all the traffic from the spoke has to go through the hub and it's forced that way through Frame Relay. So what you have to do is you have to go into this interface, this serial 0 slash 1.1 interface and you have to force it to be a Point-to-Multipoint network, just like we have to force the Loopbacks to be a Point-to-Point so that they advertise the correct Subnet Mask. So go back into Config Mode, we'll do Interface Serial 0 slash 1.1 and we will do IP OSPF Network Point-to-Multipoint. Now if we exit out we do Show IP OSPF Interface and we look at the serial zero slash 1.1 interface down here, we now see that it is a type Point-to-Multipoint and you'll notice that since that it is a Point-to-Multipoint network, unlike this network up here, we don't need a DR or a BDR because remember the basics video. The Point-to-Multipoint type doesn't use Manual Neighbor Statements, doesn't use Designated Router or a Backup Designated Router, it all just kind of works, assuming you've got the Broadcast Keyword on your Route Maps which, which we do for the lab. So now let's go to Boston and let's configure Boston up. So the two interfaces we're going to advertise is this 192.168.3 and then the 1.1.5.1. So Config T, Router OSPF 1, we'll set the Router ID 1.1.5.1. We will do Network 192.168.3.0 0.0.0.255 Area 51. We'll also do Network 1.1.5.1 0.0.0.0 Area 51. And now we've configured OSPF and we're not getting a neighbor coming up. If we do Show IP OSPF Neighbor, oop, can't type, SPF Neighbor, there's nothing in the Neighbor Table there. If we go back to the East Router, do the same thing, we only have the one neighbor. It's a Full and that says that neighbor is a Designated Router but other than that we don't have any other neighbors here in the East. We don't see Boston, obviously we don't see Newark because we've not set up Newark, why is that? Well this is kind of the gotcha. You'll notice on this, since it is a Multi-point Interface the Hello and the Dead Timers are 30 seconds and 120 seconds respectively. If we go over to Boston, we do a Show IP OSPF Interface it says it's a Point-to-Point, the Hello Timer is ten, the Dead Timer is 40. The Dead Timer defaulting to four times the Hello Timer and if you'll recall if the Hello and the Dead Timers don't match, then you don't form a neighbor adjacency and OSPF just doesn't work. So we'll fix this in the next video and carry on with configuring Newark.
Tutorial Information
| Course: | Implementing Cisco IP Routing (642-902 ROUTE) |
| Author: | Greg Dickinson |
| SKU: | 34291 |
| ISBN: | 978-1-61866-028-2 |
| Release Date: | 2011-12-28 |
| Duration: | 10 hrs / 105 lessons |
| Work Files: |
Yes |
| Captions: | No |
| Compatibility: |
Vista/XP/2000, OS X, Linux QuickTime 7, Flash 8 |
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