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Implementing Cisco IP Routing (642-902 ROUTE) Tutorials
BGP / Lab - Full-Mesh BGP pt. 2
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Subtitles of the Movie (Implementing Cisco IP Routing (642-902 ROUTE) / BGP / Lab - Full-Mesh BGP pt. 2)
So we're setting up our Full-Mesh of BGP and we're now going to set up Access 1 and Access 2 to be neighbors to Core 1. Let me just go ahead and Exit Config Mode on Core 1. So we'll go over here to Access 1. Config T, Router BGP 12, Neighbor 10.20.1.1, Remote AS 12 and do the same thing on Access 2. Config T Router BGP 12. We'll do Neighbor 10.20.2.1, Remote AS 12. Now let's give BGP a little bit of time to catch up with us and we'll look at the Routing Tables and check the Trace Routes and what not and make sure that all of our work, worked exactly as we expected it to. So now we're back here on Core 1 and we've noticed that we've got two new neighbors. If we do Show IP BGP Summary we are getting prefixes from both of these. Getting seventeen prefixes from one and fifteen from the other. If we do Show IP BGP we now see all of these networks advertised, all internally but lo and behold, none of them are the best routes, none of them are getting installed in the Routing Table because look at the next hops. The next hops are inaccessible. We've ran into this problem before, so how do we fix it? Do you remember how we fix it? That's right as I'm filling in the answer that you gave. We go over to the Access 1 and the Access 2 Routers and we say for this neighbor, make the next hop for EGBP networks meet. So we'll go over here to Access 1, we'll do Show Run Section BGP just to check that this command is not already there, which we know it's not. In this case we need to do Neighbor 10.20.1.1 and we verify that we need to have this next hop Self Command for Neighbor 10.20.1.1. We got Remote AS 12, we need to Next Hop Self as well. So Config T, Router BGP 12, Neighbor 10.20.1.1, Next Hop Self. We'll do Clear IP BGP star and do the same thing over on Access 2. So Config T, Router BGP 12, Neighbor 10.20.2.1. Next Hop Self. Clear IP BGP and we'll wait for BGP to clear and re-establish and we'll see what we get. So now we've given BGP enough time to catch up with all of the changes we've done. We just bounced our entire network like a big red rubber ball. So we'll do Show IP BGP now and we'll see that we're getting best routes injected into the Routing Table and we are. We've got the best routes for these networks being injected up to the Core 1 leg or you notice the networks for the 50.10 which is over here under Access 1 and ISP 1, they are now actually going out to 10.20.1.2 which is the Access 1 Router. The 150 networks are going out 10.20.2.2 which is the Access 2 Router. So now if we go to Ping 150.10.1.1 we should complete now. So Ping 150.10.1.1 and we're successful. If we do a Trace to 150.10.1.1 we should see that we go through AS 12 and then right out to AS 50. So there we are. We went through the planning and the implementation and the verification for an entire BGP Infrastructure. You should be proud of yourself. If you can master BGP in my opinion, you've got a good 33 35 40 percent of the CCNP ROUTE exam under your belt. For now however, this concludes our discussion of BGP.
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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