Today we're going to be covering something called route: redistribution, Which is a fun topic. That's covered starting at the CCNP Enterprise and going up so if you're studying for the CCNA - and 301, I mean Who am I to tell you not to read but keep in mind that you are probably actually not probably will you will not be expected to Know this content for your CCNA exam if you want some more sustainable content, The article directly previous list 1. My first article covers how to set up single area LSP fe2 at the CCNA level. So if you have a good conceptual understanding of all SPF - and you just want some extra help - configuring it go check out that article link in the description below today we're going to be covering again route redistribution and to help me with that explanation.

These two neighbors are - or these two routers are neighbors over this physical link and t're, Changing the edge RP routes and t're all happy, And t are half t have a fully converted. GI GRP, Topology OSPF is also running over here, Sir, Is an adjacency over is a physical link and OSPF is running just fine, Exchanging routes and everything. Here's the problem, The OSPF routing process, Doesn't know about the eigrp routes and the eigrp running process didn't know about the LCF routes, So any networks have been shared into OSPF. The EIGRP routers can't get to any routes step in sharing the erp. Do SPF runners can't get to there is a segmentation of routing information sources and that's not necessarily what you want when you have multiple routing for the cause, Our inner operating within one large enterprise network.

If you have an e idrp core and other segments of your network, There OSPF as an example, You may want the EIGRP rallying process in your core to be aware of those OSPF routes that t can. You know, Do their dark jobs as routers. There's a lot of ways we can get around this actually all come with their own advantages in this managers, So we could use this default route, So a default route is as a reminder, A route to 0000 - to zero interpretation. Anything right, But because the routing table routes based on the best match. First, The route, The default route only used as a gateway of last resort.

If there's no other more specific routes available use this route where's the problem with that that gives one statically defined destination. That's it if you've got routes both in downstream to your router and upstream to that rather too bad. You can only go in one direction with the gateway of last resort. There's no specificity in terms of what I want these networks to go down.

Shame and these network single option. No, Unless you do some other routing manipulation, Just with a static default route by by itself, There is no kind of selectivity in terms of well. I want lists route, These routes to go down here and these jobs to go up here.

It's just one destination and that's the nature of it being a route to what is considered one destination to zero. Zero zero zero slash zero, Even though it captures a Palestine redistribution, On the other hand, Takes specific prefixes from a routing information source and I'm careful not to use the term routing for the call, Because routing protocol defines really a dynamic routing protocol. Your BGP, Your is, Is your ripple SPF eigrp, All that, Whereas routing information source includes connected routes die grouse, No other sources where you can get routes from you can read this reviews connected and read this new study. Hence, Why I'm careful to use the term routing information sources and not running for the calls, But going on redistribution here, Adds very, Very core.

It's a very simple concept. You take routes from water running protocol and you translate them into another running for the call. A common example that I like to use common analogy die like to use that the strawberry distribution is an English band and the French man right.

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You got a translator in between that understands, Both English and French, And as long as that, Translator is doing his job. S or her job of translating the English language to French language and vice versa, T again communicate happily the English man and the French man don't understand assurance languages, English words and French words are completely different and unless the English man happened to take French in high School, He won't understand what the French man is saying. Without lack translation in place, That's similar to concept of redistribution rallying protocols are very, Very different in how t store their routes.

For example, Our net OSPF uses a metric of cost. The IG RP uses the composite metric. That's made up of a ton of different vectors bandwidth, Low delay, Reliability, OSPF can't just understand in the ia GRP. Well, That's not how it works. There needs to be something in place that translates the contents of any ICRP route to be OSPF compliant.

So then it can be loaded into the OSPF and link state database and use within the OSPF domain latch. What redistribution is formed? Redistribution takes the role of the translator. In the previous analogy, It takes the eigrp routes and translates them and vice versa or, However, You want to configure the redistribution to work. So there's a lot of ways: you can figure a distribution. In this case, I have a separate board around configured, But you don't need this.

The requirement for a rather to do redistribution is multiple, But there's one I want to hone in to is, Though, And that's that the router that's actually doing a redistribution has to be part of both rally domains. So when I say rallying domain, What I'm really talking about is this e IG RP is one rally domain. This eigrp autonomous system lists OSPF, Like we don't really call it autonomous system, But I'll use the term anyway.

Autonomous system is one rally domain. So with redistribution. We would be if we use in this example, We would be redistributed from the EIGRP of routing domain to the OSPF rally domain. Now, What we're doing when we are reading on the router? That's actually doing a redistribution that rather has to be part of both routing domains, Because it has to take routes from one rallying domain and put them into the other.

The only way that rather would know what route are in the first round domain is, If it were part of that round coming so in this case, What that means simplifies is that this border router right here, I late I've, Put it as a separate shape on The diagram to visualize it more easily, This border router here, Has to have a neighbor ship in the edge ERP neighbor ship with this router one, And this also has to have an LS PF adjacency with this other, Rather one that's operating with an OS yep. So it's critical that you understand that I can't just have a solely eigrp rather translate routes it has to be running both processes so that a it can understand both routes, Both kinds of routes and be so that it can actually pull route. In now. Here's the thing with a border router, It doesn't have to be a separate router.

I don't have two ways of ours on another Cisco router. It is like in the redistribution. Remember, The requirement is that that router has to be part of both domains. Well, If I wanted to what I could do, Is delete this and just create a link between these two others, Because if I were to make this router here is route, The edge ERP router, One rather neighbors in VI GRP, With rather two and adjacent to the Ospf router over this link. Well, It's just become what we call an autonomous system boundary rather so this is now in its current state and asbr autonomous system boundary. Rather that's a term.

That's pretty much! Only officially used in here it's a boundary to the autonomous system. It's a boundary to the EIGRP autonomous system, Because it's taking VDI GRP routes and the solid line means redistribution, Redistributing them into yes. Now, OSPF now knows what the ldrp routes, But what if we want GRP to know about the onus PF routes? Well, We could do this, We could have this router say. Now I want oh s, PF routes to be put into EIGRP so, And this is actually is not a very good relationship to have drawn. This is a little better, So this asbr is doing all of the redistribution.

This represents the OSPF routes. This represents the EIGRP realms , So Lee OSPF routes are going down. So this the idea appear either the EIGRP routes are going down, Whistles PF rather and t're going to get propagated into their various routing domains.

Now I chose the IGR pls PF because t have equally quirky ways of handling redistribution regeneration and rip is easy. Redistribution B to be slightly more involved in rip, What's so relatively easy, The itrp and Ellis PF are protocols that have quirks when you're doing redistribution and that's something. We'll get more into in the next article, But that pretty much concludes this particular article in this article.

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