So we're continuing on with our Basic Route Redistribution. We are Redistributing EIGRP into OSPF. We talked about the Metric Command where you can set a Default Metric for routes that are introduced into OSPF. Now we're going to look at the Metric Type. So I'll go ahead and type Metric Type and hit Question Mark and you see we have the option for OSPF External Type One Metrics or Type Two Metrics. Now the only difference between External One and External Two is that External Type Two Metrics do not increment as the OSPF route is distributed around the network. Type Two Metrics are the default if you'll recall from our OSPF Lab where we introduced basic Redistribution to show you how the different areas handled that LSA type. You saw that the routes came across as E2 type routes. Most of the time E2 will get you exactly what you need, however if the lab specifies that the Metric has to increment as it's passed through the network, you will want to specify the Metric Type of one. In this case, we're not going to specify a Default Metric or a Metric Type, we're going to leave all of that as the defaults and we're going to Redistribute EIGRP 1200 Subnets and hit Enter. So now let's go up here to Router 4 and look at his Routing Table now and you'll notice that now we have these routes are being distributed to us as EIGRP External Type two routes. Since we are Redistributing Subnets and we're not Redistributing the entire 10.0 network, this router says, well I'll accept these routes and put them into my Routing Table because I don't know about them already and they're not so overly Classful that they're just garbage. Now again, remember that I said that Redistribution has to go both ways. Again a lot of people will say well I've set up Redistribution, let me go over here to Router 1 and look at his Routing Table. Well why am I only seeing my EIGRP routes? Where's my OSPF routes? I'm doing Redistribution, well you're Redistributing into OSPF, you're Redistributing into EIGRP, you're not going the other way. Oh, okay, yeah, okay I gotcha. Well let's go over here to router 3 and Redistribute the other way. So we'll exit from the OSPF Mode. So we'll do Router EIGRP 1200. We'll do Redistribute OSPF Process ID 1 and you'll notice we don't have the Subnets Command on this guy, we don't need to use that because again, by default, OSPF does not automatically summarize. You have to go in and manually specify Summarization at your Area Border Routers but we won't get into that again. Redistribute OSPF 1. Okay well I can specify a Metric but I didn't have to specify one when I Redistributed into OSPF and I'm not doing Route Maps or Matches or anything like that. You know, I can go in and say, I only want to do internal or external or Not So Stubby, you know, I'm not doing any of that, I just want to get everything that's in OSPF into EIGRP. So I'm going to Redistribute OSPF one just like I did with EIGRP and hit Enter. Okay, well let's wait a second, we'll go back up here to Router 1, we'll look at his Route Table. Well I'm still not seeing any routes, well why am I not seeing routes? I typed the command, come on man, you're, you're, you're messing with me now. You can't expect me to believe that the same command didn't work the other way? Well it didn't. If you'll recall from our discussion of EIGRP, the EIGRP Metric is composed of many variables, Bandwidth, Delay, MTU, you could have any number of variables that compute to the EIGRP Metric, whereas OSPF, it's just cost. It's just a single number and it says this is the cost to get to that network, like it or lump it. With EIGRP, you have all of these variables. By default, if you do not specify a Metric, when you Redistribute from OSPF into EIGRP, it Redistributes with an infinite Metric, meaning that here's these networks, however, there are so far away you'll never get to them. At which point the EIGRP process doesn't even put them in the Routing Table. For example, let's go over here to Router 2, we'll do Show IP OSPF Topology, well it's not OSPF, it's EIGRP, I'm an idiot. So we'll do Show IP EIGRP Topology and you notice that's not even making it into the Topology Table because the EIGRP process on Router 3 is saying, I'm not going to advertise that, it's so far away, there's no point in it. Let's fix that in the next video.
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