So we're going to jump off into the world of Route Redistribution. And I know you may be looking at the course outline and saying well, you've got another routing protocol on there, you've got BGP in the next section, why are you teaching me about Route Redistribution before I learn about all the routing protocols? And honestly, I had the same question myself when I first went to set up this outline. Why is everyone teaching Route Redistribution before they teach all the routing protocols? And then it kind of occurred to me, well, really one of the only ways to get routes into BGP is to redistribute them from other Interior Gateway protocols. So you have to know how to redistribute the routes before you can teach BGP and Redistribution. So that's why it's in this order. If you're, you're real, really a purist you can jump ahead to BGP and then come back to Redistribution but it will make a lot more sense if you know what Redistribution before you jump into BGP. So what is Route Redistribution? Quite simply, it allows you to take routes from one Interior Gateway protocol and place them into another Interior Gateway protocol or into BGP but that's really the, the outside use for Redistribution. As you redistribute these routes between routing protocols you can manipulate the routes as their injected into, for example, EIGRP, you can Tag it and say, I only want to see even numbered networks from this Subnet or I want to inject these routes with a specific Metric or a specific cost and therefore make these routes more preferred or less preferred depending on how you manipulate them. Now what are some of the uses of Route Redistribution? Some of the major uses that you'll run across for Redistribution is when two companies merge together. Let's say Bank A buys out Bank B, well Bank A may use EIGRP Autonomous System 6500. Bank B may use EIGRP Autonomous System 1200. Well obviously eventually you'd want that to be one big happy network but in the interim you have to be able to access their systems, they have to be able to access your systems and so you'd set up a router in the middle that's a member of both Autonomous Systems and Redistributes routes between the systems, either Redistributes the entire Routing Table or just portions of the Routing Table and again you run into situations where you have routes that would overlap and you got to Nadding and Tunneling and that's later on and in a higher level course but this is first and foremost the biggest use that I've seen in my career. The next use would be to separate responsibilities for separate portions of the network. Let's say that you are an administrator in the corporate office in Birmingham, Alabama and you have another corporate office in Dallas, Texas. Well you want to be able to allow the administrators in Dallas, Texas, look you can do anything you want to, with your routing domain. You can just create loops and just screw the whole thing up if you want to, but I don't want you messing up the core network here in Birmingham so I'm going to give you your own OSPF Infrastructure, your own EIGRP domain and I'm going to Redistribute certain routes to you and you're going to Redistribute certain routes to me, so that we can talk, but I'm not going to let you directly manipulate my Routing Table. That's pretty similar to one of the other reasons which we'll get to a little further down the list. The next is Router Vendor Inoperability. Let's say that you have a Core network that's an all Cisco Network, so you're running EIGRP in that Core network because of it's fast convergence time and it's ease of set up and ease of Summarization. However you have another data center that you're bringing on line and in their data center, they may use Juniper Routers. Well Juniper Routers obviously don't support EIGRP because EIGRP's a Cisco Proprietary protocol. So this data center may use OSPF or may use BGP or some other routing protocol. Well obviously you need to be able to route between both of your data centers and so you can have one side of your router run OSPF for the Juniper Routers and the secondary data center and you can have your Core network in your primary data center run EIGRP. The next use would be WAN provider requirements. In my day job we have an MPLS WAN and we distribute our EIGRP routes from all of our branches into the WAN providers BGP network and then they carry those routes and spit them out BGP on the other end on our data center and then we take the BGP routes and Redistribute them back into EIGRP. Big MPLS networks will generally use BGP on their backbone and so therefore unless you're going to run BGP internally which you can, but it, it's really kind of a pain, you will have to Redistribute your internal routing protocol whether it's EIGRP or OSPF into their BGP and vice versa. And the last major reason or the last major reason according to the documentation anyway, is for a BGP backbone. Again, let's say you are a multi national corporation. So you have an office in the Americas, you have one in Mexico, in Brazil, in Europe and in Asia. Well you're obviously not going to want to carry EIGRP or OSPF routes across the entire globe. I mean the convergence time would just be nuts if you're, you know, you have the network that goes down in Asia and you have to trunk those OSPF LSAs all the way to the Americas. In this case you would have a global network that is a BGP network and you would Redistribute your individual routes from the US and from Canada and from Asia and Europe and Australia into this BGP backbone. BGP is designed for really large networks and lots of routes. It has it's own little issues as in BGP is the slowest converging route protocol on the planet but it's designed for large backbone networks like this and so, this is another large use of Redistribution in enterprise networks. We'll carry on with our introduction to Redistribution 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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