Implementing Cisco IP Routing (642-902 ROUTE) Tutorials
Advanced OSPF / Lab 3 - Route Summarization pt. 2
Visitors to VTC.com will be able to view all introductory videos for each training course.
Free Trial Members will gain access to first three chapters for each training course.
Full Access Members have full access to VTC.com�s entire library of video tutorials.
Learn More
Subtitles of the Movie (Implementing Cisco IP Routing (642-902 ROUTE) / Advanced OSPF / Lab 3 - Route Summarization pt. 2)
So we're talking about Route Summarization. We have summarized routes from the West side of the network. Now we're going to go over to the East side of the network and we're going to summarize routes over here as well. Now you'll recall if we go over and look at the Boston Router and we do the Show IP Route over here, we are actually getting all of the routes into Area 2 because we can't have Area 2 be a Stub Router because it has a Virtual Link going through it and in fact we're already getting that Summary Route over here in Area 2. It's being advertised through Area 0 out to Area 2. So what we're going to do for Area 2 is we're going to configure Summarization both ways. We're going to summarize all of the routes in Area 0, the 10.0 networks into Area 2 and we're going to summarize all the Area 2 networks into Area 0. So that way we'll shrink the Route Table on both Boston and in Area 0 up there on Chicago. So go into, not here on Boston, we'll go onto the East Router, that's where the Summarization's going to take place. Config T, we'll do Router OSPF 1, we'll do Area 0 Range 10.0.0.0 255.255.0.0 and we will do Area 2 Range 10.2.0.0 255.255.0.0. Now we Exit here. Obviously the Route Table on East isn't going to shrink any. We'll do Show IP Route over here. Just to show you that. And we'll see we've got this huge Route Table on this Area Border Router. We're getting some of the Summary Routes again that 10.1 Summary Route is coming over from the West Router. Let's go up here and look at Chicago and look at the Show IP Route up here and you'll notice that Chicago's Route Table is smaller because we're are now getting two Summary Routes. There's the 10.2 networks, there's the 10.1 networks, we're still getting the 10.3 networks being advertised from East Poddunk and we're about to fix that as well. More importantly let's go look at the Boston Router and we'll do Show IP Router over here. We're getting all those External Routes from our two Redistributions. And we're still getting our 10.2 and 10.3 Routes, but there's our 10.1 Summary and our 10.0 Summary hasn't made it down to this router yet. So we'll give it some time as we go through this lab and we'll, we'll come back and check on this later. Again, let's go to East Poddunk. Now East Poddunk, even though it's down here below our Stub Area, Area 2, it still has that Virtual Link through Area 2 back up to the East. So we'll summarize the networks here at East Poddunk. We'll Config T, we'll do Router OSPF 1, we'll do Area 3, Range 10.3.0.0 255.255.0.0 and we'll do the Area 0 Range as well. Area 0 Range 10.0.0.0 255.255.0.0 and now if we look at East Poddunk, we get all of our External Routes here and we still get all of Area 2 Routes because technically our router is still in Area 2 even though that Area 2 is a Transit Area. So we're not really shrinking the Route Table that much by Summarizing Area 0 or not as much as I though we would to be honest. However, let's go back up and look at Chicago, check out this guy's Routing Table and see how small it gets. Much smaller, again we're still getting some slash 24 routes from 10.2 but I'm, I'm willing to bet that's probably because the way we have the Virtual Links set up inside Area 2. I'm willing to bet if we didn't have that Virtual Link, that these routes would summarize a lot more neatly than they did but as you can see we still shrunk the Route Table somewhat. We still got this Summary Route from Area 3. We're not getting the summary from Area 2. Let's go back to East and make sure that I configured this router right. Make sure I didn't boof up the command somehow. Area 2 Range, yeah I did, so the only thing I can think of is that, that's an artifact of Area 2 being a Transit Area for that Virtual Link. At any rate, we've demonstrated Summarization, we've shown you the command that demonstrates how it works and how we can in theory shrink the Route Table on some of our Core Routers if we don't have these Transit Areas set up. And that concludes our discussion of OSPF Redistribution and concludes our discussion of OSPF.
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 |
VTC Sign up & Benefits
- Unlimited Access
- 81,350 Video Tutorials (14,200 free)
- Video Available as Flash or QuickTime
- Over 715 Courses
- $30 for One Month Access
- Multi-User Discounts Available
