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Implementing Cisco IP Routing (642-902 ROUTE) Tutorials
Advanced EIGRP / Lab 3 - Summarization pt. 1
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Subtitles of the Movie (Implementing Cisco IP Routing (642-902 ROUTE) / Advanced EIGRP / Lab 3 - Summarization pt. 1)
So we're carrying on with our EIGRP over Frame Relay Lab. We've gotten our entire EIGRP network up and running and we've met the first objective, configure EIGRP on all routers on the network using EIGRP Autonomous System 90. Ensure that EIGRP updates reach all routers on the network. If you'll recall we had to Disable Split Horizon on a couple of interfaces to make this happen. You may not change the underlying network configuration to do this. It would have been real simple to go into our Frame Relay Switch and say well I'm going to define a new PVC between West and South, and between North and East. We wouldn't had to have disabled the split interface here on the Central Router, however the lab objectives prohibited that change so therefore we couldn't go in and change the PVC or the IP configuration, we had to make do with what we were given. So now that we've accomplished objective one, let's move onto the second objective. Ensure that EIGRP uses an Efficient Summary Address on each router to minimize the size of the routing table. Now we've noticed we've used the word efficient. Now we could just summarize again 10.3.0.0 up here, 10.2.0.0, 10.11.0.0. However, we don't want to do this, we want to summarize efficiently so that again, if networks are added to one of these other locations down here, that may or may not be authorized. They're not advertised to the entire enterprise at large. So if we look at for example, the West, here's the routing table for the West, you notice we've gotten all of these routes in this routing table. And this isn't that big of a routing table but let's say you had 200 locations instead of just the four we have and you have four networks at each of those locations, you can see how your routing table would get pretty big, pretty quickly. So we're going to do summarization at two levels. First of all, we're going to summarize each of these locations networks into a Summary Route, for example, East will advertise just the 10.3, the North will advertise the 10.2 and then since central has split the network in half, we're going to advertise Summary Routes for the North and East, back out to the West and South and vice versa. So we're going to summarize each of these locations and then we're going to summarize each half of the network and that will reduce the amount of routes that's in each of the routing tables all across the network. So let's get started. Let's start here on the Central Router and if you'll recall Summary Routes are specific to the interface they're being advertised on. So in this case, we're going to advertise the 10.1 network out this .1 interface. So if we do Show IP Interface Brief, we'll see that the .1 interface is serial 00. We could have looked up at the routing table to see that but I wanted to show you this command just to, in case you hadn't used it. So serial 00 is where we're going to do our Summary Address, so configure T, interface serial 0 slash 0. We're going to do IP and we'll look at the help and the help should be Summary Address and there it is, right there, IP Summary Address. This is an EIGRP summary so we're going to do EIGRP, Autonomous System 90. The Summary Address will be just about exactly or will be exactly what the network command was. So we'll do 10.1.0.0 with a subnet mask of 255.255.248.0. Once we do that, it tears down the adjacencies to both of these neighbors since we've configured a summary and in about 60 seconds these adjacencies will come back up. We'll hop out here and we'll write this config just to be safe. So now both of those adjacencies are back up. Let's look over here on the North and we'll do Show IP Route and we now have a Summary Route to the 10.1 network. 10.1.0.0 slash 21 instead of all of those 10.1.1. .2, .3 et cetera routes in the routing table. So we'll step you through configuring the summaries on the North and in the interest of time here in the lab, I won't go through this Summary Address on all of these routers, simply because you've done it earlier on in the course when we talked about Configuring Summarization. It's really just kind of a review, where you can see it on a bigger network. So here on the North network, all our routes are coming out serial 00 just like on the central. So we'll do Config T, we'll do interface serial 0 slash 0. We'll do IP Summary Address EIGRP Autonomous System 90, the summary will be 10.2.0.0 with a subnet mask of 255.255.252.0. Again once we do that the summary for the central goes down. So we'll write the config out and we'll wait a second for the adjacency to come back up. Now that it is, let's go back to central and we'll do Show IP Route here on the central and we should see a Summary Route for that 10.2 network instead of all the individual 10.2 networks and there it is. 10.2.0.0 slash 22 via this router, the .2 router. And you can see that the route table is already starting to shrink. Let's hop over to the East Router and set that summary up and then we'll come back and look at the central. And now that you see that the adjacency has gone down and come back up, let's go back up here to central, do a Show IP Route and as you see, we have a much smaller routing table, even so there's the 10.3.0.0 subnet that's being advertised by the East Router. We'll pick up with our Summarization in the next video.
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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