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What routing protocols will you use in a network design project?

OSPF and EIGRP are popular routing protocols and both can play a role in network design projects. Learn the differences between OSPF and EIGRP routing protocols and why each one brings benefits to your network design.

Q: What routing protocols will you use in a network design project?

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Thomas A. Limoncelli is an internationally recognized author and speaker. He is best known for his books The Practice of System and Network Administration (with Christina J. Hogan and Strata R. Chalup), Time Management for System Administration and The Complete April Fools RFCs (with Peter J. Salus). Read more about Tom and his books at Everything Sysadmin.

[In a network design project] we have different networks and different network segments, and the routers need to know how to route between them. Because these segments come and go, we [usually] can't just use some kind of static configuration. There is a static routing configuration called static routing, where you just hand-configure every router to know how to get to every other network , and it's common in very small networks with less than about five routers.

But once you get larger than that, you're going to need to pick a routing protocol to manage those routes for you. Two common ones are OSPF and EIGRP,

More from our expert
Download Part 1 and Part 2 of Tom's FAQ podcast or read a chapter on centralized/decentralized networks from The Practice of System and Network Administration, 2nd Edition, by Thomas A. Limoncelli, Christina J. Hogan and Strata R. Chalup.

 and there are tradeoffs between the two. OSPF is an open standard and it's supported by many vendors. EIGRP has some benefits over OSPF: it's a little faster [to converge] when there's a link down. But EIGRP is only available on Cisco routers, so if you use EIGRP, you're locked into Cisco products, whereas OSPF will enable you to choose from a variety products and companies.

Dig Deeper on Managed network services technology

Designing an optimal Layer 3 for Cisco network service architectures This chapter from 'Authorized Self-Study Guide: Designing Cisco Network Service Architectures, 2nd ed.' examines a select number of topics on both advanced IP addressing and select design issues with Border Gateway Protocol (BGP), Enhanced Interior Gateway Routing Protocol (EIGRP), and Open Shortest Path First (OSPF). Advanced IP addressing and routing protocol design encompasses a large amount of detail that has already filled a number of books on routing protocols and networking best practices. Learn how to design addressing solutions to support summarization, design routing solutions to support summarization, route filtering, and redistribution, and design scalable EIGRP, OSPF and BGP routing solutions for the enterprise.

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