We're still working on getting all of our networks into BGP. We've got all of our networks into BGP but we still can't Ping from Access 2 to the ISP 1 Router and the more astute among you may have already figured out why. I purposely led you down this path just to show you some of the troubleshooting that you have to do when you implement BGP and you implement Multi ISP BGP and then they'll be some other situations, it's just about exactly like this further down the road when we talk about how to prevent you from becoming an ISP basically. So if we look on the Route Table for ISP 1 and we do Show IP Route, we've got routes going to 192.168 networks and the 10.20 networks via 188.8.131.52. However we can't get there from Access 2. If we do a Trace Route we see that the packets stop at 10.20.2.1. Well that's our Core 1 Router, so if we go over here to Core 1, we do Enable, Show IP Route. Well this guy doesn't know how to get back to the 50.1.1 network. Now we could go into the process of Redistributing BGP routes back into OSPF and that is a valid way of fixing this particular issue, however, I want to demonstrate something later down the path, so what I'm going to do, is I'm simply going to put a static route on the Core 1 Router and tell it, you hand all of your data off to Access 1. Now I'll kind of pull back the curtain here as we get further down the line, we will eventually Redistribute BGP into OSPF because I'm intentionally creating a situation where we're going to have a Routing Loop later on. But again, I'm just walking down the path of someone who may not understand how all this stuff works and taking a lot of the steps that I've seen network engineers or network administrators try to do throughout my career to fix these type of problems. Well, okay, Core 1 needs to be able to get to this guy so let's just set a static route. So we'll do exactly that. Config T, we'll do IP Route 0.0.0.0 with the Prefix Mask 0.0.0.0 and we will send it to the next hop address which is 10.20.1.2, 10.20.1.2. So now we do a Show IP Route, we now have a Gateway of Last Resort to network 0.0.0.0. We have that static route there that's it's learned via itself. So now let's go back to Access 2, do this Trace Route again and hey we can get to 184.108.40.206 it even shows you that it's an Autonomous System 127 because it understands BGP, the Access 2 Router does. So now we can go from Access 2 to ISP 1. We should in theory also be able to go from ISP 1, well that command, I guess is not in the history, from ISP 1 over to Access 2. We'll try to Ping 10.20.2.2. Ping 10.20.2.2 and we can go from ISP 1 over to Access 2. So now let's go further down the list. We'll save this Access 2 link over on this side of the network for the next section of videos because you'll notice that this guy has two Serial Links between Access 2 and ISP 2 and so therefore we have to configure BGP a little differently on this side. Let's configure the link between ISP 1 and Customer 1. Let's Redistribute these 50.10 11 and 12 networks and these 10.5 networks into BGP and make sure that we get from Customer 1 all the way up to at least Access 1. So we'll go over to ISP 1 and we're going to do Show IP BGP. We see there's all the networks that we're learning about via BGP. So let's go ahead and interface, Show Interface Brief. Let's go ahead and put this 220.127.116.11 slash 30 network into BGP. So Config T, we'll Router BGP 127, Network 18.104.22.168 with a Mask of 255.255.255.252. While we're at it, we're also going to set up Redistribution on this guy. We're going to Redistribute all of our connected networks. So we'll Redistribute basically these three Loopback Interfaces into BGP as well. So we'll do Redistribute and we'll say Connected and if we wanted to we could specify a Metric or a Route Map. In this case we won't do either of one of those, we'll just Redistribute all of the connected networks into BGP. So now we do Show IP BGP on this guy, we are not Redistributing them quite yet, because again BGP takes awhile to converge. So let's pause for a few seconds and let BGP catch up. And there you have it, we're now Redistributing all of these 50. networks into BGP via ISP 1. Let's go over to Access 2, do Show IP BGP on this guy and let's see what he sees as far as those networks and it shows that they're all valid networks and it is the best route to all of those networks by virtue of that little carrot that you see there and so as a result, these networks should be making it into the Routing Table. So Show IP Route and there's all of those beautiful BGP routes going to 10.1 and 12.1 and 11.1 networks in the, the 50. network. So let's do Ping 22.214.171.124, we can actually Ping there. If we do a Trace Route 126.96.36.199 it shows us that we go to the Core Router and then out to the Access 1 and then it shows us that, that network is being advertised through AS 127. So we'll continue putting the rest of the networks down this path of our network or down this side of our network in the next video.
|Course:||Implementing Cisco IP Routing (642-902 ROUTE)|
|Duration:||10 hrs / 105 lessons|
|Captions:||Available on CD and Online University|
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