OSPF Redistribution: Quick Guide

Redistribution is a process that allows you to share routing information between different routing protocols. This can be a helpful tool if you want to use more than one protocol on your network.

In this article, we will take a quick look at how OSPF redistribution works. We will also discuss some benefits and drawbacks of using redistribution in an OSPF network.

OSPF Hierarchy

What Exactly is OSPF Redistribution?

Before going into OSPF redistribution, we should briefly discuss what OSPF (Open Shortest Path First) is. It is a routing protocol to find the shortest path between two devices on a network. It is a link-state protocol, which means that it keeps track of the state of the network links and calculates the best route based on that information. OSPF is a widely used routing protocol. It is known for being stable and reliable and can be used in networks of all sizes.

Redistribution between different routing protocols is a complex process, but in general, it allows for sharing information between networks that use different protocols. In the case of OSPF, redistribution occurs when routes from other protocols are injected into the OSPF network or vice versa.


There are several benefits to redistributing routes in this way. First, it allows for greater flexibility in terms of routing. In particular, it can be used to connect disparate networks that would otherwise be unable to communicate with each other. Second, redistribution can improve network performance by allowing for more efficient routing of traffic. And finally, it can provide redundancy if one routing protocol fails or is unavailable.

However, there are also some challenges associated with redistribution. In particular, it can lead to routing loops if not correctly configured. Additionally, it can add complexity to the network and make it more difficult to troubleshoot problems. For these reasons, careful planning is required before implementing redistribution in an OSPF network.

How to Redistribute OSPF into BGP?

One way to redistribute OSPF into BGP is using the redistributing OSPF command. This command will instruct the router to send a copy of the OSPF routing table to the BGP process. The router will then add the OSPF routes to the BGP routing table.

How to Redistribute BGP into OSPF?

There are several ways to redistribute BGP into OSPF, but the most common method is to use a route map. A route map is a set of instructions that tells a router how to handle the traffic that matches specific criteria. Creating a route map and applying it to BGP allows you to control which routes are redistributed into OSPF.

You may like this post: BGP vs OSPF

How to Redistribute OSPF into EIGRP?

The process of redistributing routes from EIGRP into OSPF is relatively straightforward. First, you will need to edit the EIGRP configuration file and specify which routes you want to redistribute into OSPF. Next, you will need to edit the OSPF configuration file and add a rule that tells OSPF to accept routes from EIGRP. Finally, you will need to restart both the EIGRP and OSPF services for the changes to take effect. Following these steps can easily redistribute routes between these two protocols.

How to Redistribute EIGRP into OSPF?

One way is to use the redistribute command. This command can be used with several different routing protocols, including EIGRP and OSPF. When entering the redistribute command, you must specify the process ID for both EIGRP and OSPF.

Another way to redistribute EIGRP into OSPF is to use route maps. Route maps can control which routes are redistributed and how they are redistributed. You will need to create a route map and then apply it to the redistribution process.

Finally, you can use distribution lists to control which routes are redistributed. Distribute lists can be applied to both outgoing and incoming routes.

You may like this post: EIGRP vs OSPF

Final Words

OSPF redistribution can be complex, but understanding the basics can make things easier for you.

You can find more information about OSPF on CCIE Enterprise Infrastructure Course also.

We hope this article has helped you understand the concept of OSPF redistribution.

Created by
Stanley Avery

I am a certified network engineer with over 10 years of experience in the field. I have a deep understanding of networking and IT security, and I am always looking for new challenges.

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