So we're in the process of getting OSPF up and running. We've gotten our Corporate and our Tennessee Routers talking to one another. Now we're basically just going to duplicate the configuration on the Georgia sales and Engineering Routers and I'll do that real quick and just gloss over what we're doing, because it's basically the same commands. So again over here in Georgia, Config T, Router OSPF One and then we'll do network 192.168.1.0 actually this is .4 255.255.255.252 and I always forget the Area Command, just because I'm used to working with EIGRP. So there's Area 0, in just a second we'll have our adjacency formed and there we go, loading's done. Again we can look over here on the Corp Router and we can see the same process here. We see the DBD from these routers here and it finally built all the adjacencies. So now let's go over to Sales and Engineering and these are going to look a little differently once they're built because these are all on a LAN network and you'll recall there's only two routers that actually participate in OSPF when you have a multi-access or a broadcast medium such as a LAN. So in this case we'll do Config T, Router OSPF One, and then we'll do network and let's go back out to our topology design and make sure we've got the right networks. In this case it's 10.20.1.0 slash 24. Since these are Loopback Interfaces and we'll get to loopbacks once we've gotten all our management addresses up and running because loopbacks take a little bit of special care to get them routing properly. So we'll go in here, we'll do 10.20.1.0 and we use the wild card mask for this just because it's a little easier to type out. Give it a few seconds to form this adjacency. So we've gone from loading to full. Look over here on the Corp Router and you'll notice we've got something a little different over here, DR BDR Election on Fast Ethernet one zero and this is because again, when you have five or six or ten or twenty routers on the same broadcast interface, you don't want all of them talking to each other all the time so you have two routers or really one router that does all the speaking for that entire subnet. In this case, since our Corporate Router saw a neighbor come up on it's Ethernet Interface, it decided, hey we're going to elect a Designated Router and a Backup Designated Router since there's only two of them, well one's the Designated and one's the Backup Designated and so life's all happy and good. So let's go over to Engineering and bring it up and let's see what the output looks like on corp once we do that. So Config T, Router OSPF One, network 10.20.1.0 255 Area 0. Hey I remembered the area that time without it having to bark at me. So we do that and we exit and in just a second we'll see the adjacency come up and you'll notice in this case we have adjacencies formed with both of the other routers, 10.11 and 10.10 which is corp and sales and you see here in the secure CRT terminal, that tells that there's been changes on that particular output. So we look over here on sales so it's gone from loading to full over here. Corporate, it's gone from loading to full on this but you'll notice we had another DR and BDR election on this Fast Ethernet interface. So now if we go onto Corp and we do Show IP Route, obviously we know about all the routes here on corporate, because they'll all directly connected but if we were to go over to Tennessee and do Show IP Routes we should know about the 10.20 network through OSPF. And you'll notice we are learning about 10.21.0 and 192.168.1.4 through OSPF. You recall 192.168.1.4 is this other WAN link out to Georgia. We see the same thing over here on Georgia, Show IP Route and there we have it. We're learning about the 10.20 and the 192.168.1.0 network via OSPF. So now let's do some basic diagnostics of our OSPF network and then we'll delve into getting our loopback networks into OSPF and some of the troubleshooting that you can do using those commands as well. So we'll do all of our commands here from the Corporate Router, even though corp knows about all of the connected networks, we're not learning anything through OSPF on corporate. Corporate has visibility to all of these other routers and it's going to be the most interesting one to look at in our case. The first thing we're going to want to do is do Show IP OSPF and we can do any number of sub commands in here but we'll just look at IP OSPF and show all of the processes that are running. In this case, routing process OSPF one with ID 10.10.3.1 that is the Router ID and that's pretty important when it comes to troubleshooting and we'll discuss that once we get our Loopback Interfaces into the OSPF infrastructure and we'll talk about our basic troubleshooting. We've got only single toss route et cetera, et cetera. Here is area backbone, number of interfaces in this area is three and that's correct. We have two WAN interfaces and our LAN interface. SPF algorithm last executed three minutes 59 seconds again. SPF algorithm executed ten times. We've got no other areas defined because we are in the backbone and there is only the Area 0. We've also got a bunch of other diagnostic counters here that you won't get into the CCNP level but if you take this up to the CCIE Route and Switch then you'll get to be all intimate with all of these counters and what all they do and, and honestly it's kind of a daunting task. The next command we'll run is Show IP OSPF Neighbors and that shows you all of the neighbors that it knows about. In this case we see that one of our neighbors is the Backup Designated Router and we see that the third neighbor on our LAN interface is not particpating in the Designated Router topology or the Designated Router Election Process if you will. And then we also have full adjacencies with the other two routers and since these are on Point-to-Point links we don't have the Backup Designated Router or the Designated Router. And that is pretty much how you set up and do basic troubleshooting on OSPF. In the next set of videos we'll get our loop back networks in here and we'll do some more troubleshooting once those are in there.
|Course:||Implementing Cisco IP Routing (642-902 ROUTE)|
|Duration:||10 hrs / 105 lessons|
|Captions:||Available on CD and Online University|
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